| **Summary of Significant Accounting Policies (Policies)**                | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| **Accounting Policies [Abstract]**                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Consolidation                                                            | The accompanying Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP).  Intercompany amounts have been eliminated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Use of Estimates                                                         | The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period.  Actual results may differ from those estimates.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Discontinued Operations                                                  | The Company has historically reported certain run-off insurance operations acquired in its merger with The Continental Corporation in 1995 as discontinued operations.  Due to the immateriality of the remaining liabilities, effective in the third quarter of 2011, the Company is no longer reporting these run-off operations as discontinued operations.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Premiums                                                                 | Premiums:  Insurance premiums on property and casualty insurance contracts are recognized in proportion to the underlying risk insured which principally are earned ratably over the duration of the policies.  Premiums on accident and health insurance contracts are earned ratably over the policy year in which they are due.  The reserve for unearned premiums on these contracts represents the portion of premiums written relating to the unexpired terms of coverage.Insurance receivables include balances due currently or in the future, including amounts due from insureds related to losses under high deductible policies, and are presented at unpaid balances, net of an allowance for uncollectible receivables.  Amounts are considered past due based on policy payment terms.  That allowance is determined based on periodic evaluations of aged receivables, management's experience and current economic conditions.  Insurance receivables and any related allowance are written off after collection efforts are exhausted or a negotiated settlement is reached.Property and casualty contracts that are retrospectively rated contain provisions that result in an adjustment to the initial policy premium depending on the contract provisions and loss experience of the insured during the experience period.  For such contracts, the Company estimates the amount of ultimate premiums that the Company may earn upon completion of the experience period and recognizes either an asset or a liability for the difference between the initial policy premium and the estimated ultimate premium.  The Company adjusts such estimated ultimate premium amounts during the course of the experience period based on actual results to date.  The resulting adjustment is recorded as either a reduction of or an increase to the earned premiums for the period.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Claim and claim adjustment expense reserves                              | Claim and claim adjustment expense reserves: Claim and claim adjustment expense reserves, except reserves for structured settlements not associated with asbestos and environmental pollution (A&EP), workers' compensation lifetime claims, and accident and health claims, are not discounted and are based on 1) case basis estimates for losses reported on direct business, adjusted in the aggregate for ultimate loss expectations; 2) estimates of incurred but not reported losses; 3) estimates of losses on assumed reinsurance; 4) estimates of future expenses to be incurred in the settlement of claims; 5) estimates of salvage and subrogation recoveries and 6) estimates of amounts due from insureds related to losses under high deductible policies.  Management considers current conditions and trends as well as past Company and industry experience in establishing these estimates.  The effects of inflation, which can be significant, are implicitly considered in the reserving process and are part of the recorded reserve balance.  Ceded claim and claim adjustment expense reserves are reported as a component of Reinsurance receivables on the Consolidated Balance Sheets.  Claim and claim adjustment expense reserves are presented net of anticipated amounts due from insureds related to losses under deductible policies of $1.4 billion as of December 31, 2011 and 2010.  A significant portion of these amounts are supported by collateral. The Company also has an allowance for uncollectible deductible amounts, which is presented as a component of the allowance for doubtful accounts included in Insurance receivables on the Consolidated Balance Sheets.Structured settlements have been negotiated for certain property and casualty insurance claims.  Structured settlements are agreements to provide fixed periodic payments to claimants.  Certain structured settlements are funded by annuities purchased from CAC for which the related annuity obligations are reported in Future policy benefits reserves.  Obligations for structured settlements not funded by annuities are included in claim and claim adjustment expense reserves and carried at present values determined using interest rates ranging from 5.5% to 8.0% at December 31, 2011 and 4.6% to 7.5% at December 31, 2010.  At December 31, 2011 and 2010, the discounted reserves for unfunded structured settlements were $632 million and $713 million, net of discount of $1.1 billion in both periods.Workers' compensation lifetime claim reserves are calculated using mortality assumptions determined through statutory regulation and economic factors.  Accident and health claim reserves are calculated using mortality and morbidity assumptions based on Company and industry experience.  Workers' compensation lifetime claim reserves and accident and health claim reserves are discounted at interest rates ranging from 3.0% to 6.5% at both December 31, 2011 and 2010.  At December 31, 2011 and 2010, such discounted reserves totaled $2.1 billion and $1.9 billion, net of discount of $520 million and $487 million.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Future policy benefits reserves                                          | Future policy benefits reserves: Reserves for long term care products and payout annuity contracts are computed using the net level premium method, which incorporates actuarial assumptions as to morbidity, mortality, persistency, discount rates, which are impacted by expected investment yields, and expenses.  Expense assumptions include the estimated effects of expenses to be incurred beyond the premium paying period.  Actuarial assumptions generally vary by plan, age at issue and policy duration.  The initial assumptions are determined at issuance, include a margin for adverse deviation, and are locked in throughout the life of the contract unless a premium deficiency develops.  If a premium deficiency emerges, the assumptions are unlocked and deferred acquisition costs, if any, and the future policy benefit reserves are adjusted.  Interest rates for long-term care products range from 5.0% to 7.5% at December 31, 2011 and from 6.0% to 7.6% at December 31, 2010.  Interest rates for payout annuity contracts range from 5.4% to 7.5% at December 31, 2011 and from 2.8% to 10.2% at December 31, 2010.  In 2011, the Company unlocked assumptions related to its payout annuity contracts due to anticipated adverse changes in mortality and discount rates, which reflect the current low interest rate environment and our view of expected investment yields, resulting in loss recognition which increased insurance reserves by $166 million.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Policyholders' funds reserves                                            | Policyholders' funds reserves: Policyholders' funds reserves primarily include reserves for investment contracts without life contingencies.  For these contracts, policyholder liabilities are generally equal to the accumulated policy account values, which consist of an accumulation of deposit payments plus credited interest, less withdrawals and amounts assessed through the end of the period.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Guaranty fund and other insurance-related assessments                    | Guaranty fund and other insurance-related assessments:  Liabilities for guaranty fund and other insurance-related assessments are accrued when an assessment is probable, when it can be reasonably estimated, and when the event obligating the entity to pay an imposed or probable assessment has occurred.  Liabilities for guaranty funds and other insurance-related assessments are not discounted and are included as part of Other liabilities on the Consolidated Balance Sheets.  As of December 31, 2011 and 2010, the liability balances were $152 million and $160 million.  As of December 31, 2011 and 2010, included in Other assets on the Consolidated Balance Sheets were $2 million and $3 million of related assets for premium tax offsets.  This asset is limited to the amount that is able to be offset against premium tax on future premium collections from business written or committed to be written.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Reinsurance                                                              | Reinsurance:  Reinsurance accounting allows for contractual cash flows to be reflected as premiums and losses.  To qualify for reinsurance accounting, reinsurance agreements must include risk transfer.  To meet risk transfer requirements, a reinsurance contract must include both insurance risk, consisting of underwriting and timing risk, and a reasonable possibility of a significant loss for the assuming entity.Reinsurance receivables related to paid losses are presented at unpaid balances.  Reinsurance receivables related to unpaid losses are estimated in a manner consistent with claim and claim adjustment expense reserves or future policy benefits reserves.  Reinsurance receivables are reported net of an allowance for uncollectible amounts on the Consolidated Balance Sheets.  The cost of reinsurance is primarily accounted for over the life of the underlying reinsured policies using assumptions consistent with those used to account for the underlying policies or over the reinsurance contract period.  The ceding of insurance does not discharge the primary liability of the Company.The Company has established an allowance for uncollectible reinsurance receivables which relates to both amounts already billed on ceded paid losses as well as ceded reserves that will be billed when losses are paid in the future.  The allowance for uncollectible reinsurance receivables is estimated on the basis of periodic evaluations of balances due from reinsurers, reinsurer solvency, management's experience and current economic conditions.  Reinsurer financial strength ratings are updated and reviewed on an annual basis or sooner if the Company becomes aware of significant changes related to a reinsurer.  Because billed receivables are generally less than 5% of total reinsurance receivables, the age of the reinsurance receivables related to paid losses is not a significant input into the allowance analysis.  Changes in the allowance for uncollectible reinsurance receivables are presented as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.Amounts are considered past due based on the reinsurance contract terms.  Reinsurance receivables related to paid losses and any related allowance are written off after collection efforts have been exhausted or a negotiated settlement is reached with the reinsurer. Reinsurance receivables related to paid losses from insolvent insurers are written off when the settlement due from the estate can be reasonably estimated.  At the time reinsurance receivables related to paid losses are written off, any required adjustment to reinsurance receivables related to unpaid losses is recorded as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.Reinsurance contracts that do not effectively transfer the economic risk of loss on the underlying policies are recorded using the deposit method of accounting, which requires that premium paid or received by the ceding company or assuming company be accounted for as a deposit asset or liability.  The Company had $18 million and $23 million recorded as deposit assets at December 31, 2011 and 2010, and $123 million and $114 million recorded as deposit liabilities at December 31, 2011 and 2010.  Income on reinsurance contracts accounted for under the deposit method is recognized using an effective yield based on the anticipated timing of payments and the remaining life of the contract.  When the anticipated timing of payments changes, the effective yield is recalculated to reflect actual payments to date and the estimated timing of future payments.  The deposit asset or liability is adjusted to the amount that would have existed had the new effective yield been applied since the inception of the contract.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Participating insurance                                                  | Participating insurance: Policyholder dividends are accrued using an estimate of the amount to be paid based on underlying contractual obligations under policies and applicable state laws.  Limitations exist on the amount of income from participating life insurance contracts that may be distributed to stockholders, and therefore the share of income on these policies that cannot be distributed to stockholders is excluded from Stockholders' equity by a charge to operations and other comprehensive income and the establishment of a corresponding liability.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Deferred acquisition costs                                               | Deferred acquisition costs: Acquisition costs include commissions, premium taxes and certain underwriting and policy issuance costs which vary with and are related primarily to the acquisition of business.  Such costs related to property and casualty business are deferred and amortized ratably over the period the related premiums are earned.Deferred acquisition costs related to accident and health insurance are amortized over the premium-paying period of the related policies using assumptions consistent with those used for computing future policy benefit reserves for such contracts.  Assumptions are made at the date of policy issuance or acquisition and are consistently applied during the lives of the contracts.  Deviations from estimated experience are included in results of operations when they occur.  For these contracts, the amortization period is typically the estimated life of the policy.  At December 31, 2011 and 2010, Deferred acquisition costs were presented net of Shadow Adjustments, as defined later in this note, of $412 million and $0 million.The Company evaluates deferred acquisition costs for recoverability.  Anticipated investment income is considered in the determination of the recoverability of deferred acquisition costs.  Adjustments, if necessary, are recorded in current results of operations.  Deferred acquisition costs are presented net of ceding commissions and other ceded acquisition costs.  Unamortized deferred acquisition costs relating to contracts that have been substantially changed by a modification in benefits, features, rights or coverages that were not anticipated in the original contract are not deferred and are included as a charge to operations in the period during which the contract modification occurred.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Investments in life settlement contracts and related revenue recognition | Investments in life settlement contracts and related revenue recognition:  Prior to 2002, the Company purchased investments in life settlement contracts.  A life settlement contract is a contract between the owner of a life insurance policy (the policy owner) and a third-party investor (investor).  Under a life settlement contract, the Company obtains the ownership and beneficiary rights of an underlying life insurance policy.The Company accounts for its investments in life settlement contracts using the fair value method.  Under the fair value method, each life settlement contract is carried at its fair value at the end of each reporting period.  The change in fair value, life insurance proceeds received and periodic maintenance costs, such as premiums, necessary to keep the underlying policy in force, are recorded in Other revenues on the Consolidated Statements of Operations.  The fair value of the Company's investments in life settlement contracts were $117 million and $129 million at December 31, 2011 and 2010, and are included in Other assets on the Consolidated Balance Sheets.  The cash receipts and payments related to life settlement contracts are included in Cash flows from operating activities on the Consolidated Statements of Cash Flows.The following table details the values for life settlement contracts.  The determination of fair value is discussed in Note D.December 31, 2011Number of Life Settlement Contracts Fair Value of Life Settlement  Contracts(In millions) Face Amount of Life Insurance Policies(In millions)Estimated maturity during:     201270 $16 $46201370 14 42201460 12 39201560 10 37201650 9 33Thereafter531 56 338Total841 $117 $535The Company uses an actuarial model to estimate the aggregate face amount of life insurance that is expected to mature in each future year and the corresponding fair value.  This model projects the likelihood of the insured's death for each inforce policy based upon the Company's estimated mortality rates, which may vary due to the relatively small size of the portfolio of life settlement contracts.  The number of life settlement contracts presented in the table above is based upon the average face amount of inforce policies estimated to mature in each future year.The increase in fair value recognized for the years ended December 31, 2011, 2010 and 2009 on contracts still being held was $5 million, $10 million and $10 million.  The gains recognized during the years ended December 31, 2011, 2010 and 2009 on contracts that matured were $28 million, $19 million and $24 million.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Separate Account Business                                                | Separate Account Business: Separate account assets and liabilities represent contract holder funds related to investment and annuity products for which the policyholder assumes substantially all the risk and reward.  The assets are segregated into accounts with specific underlying investment objectives and are legally segregated from the Company.  All assets of the separate account business are carried at fair value with an equal amount recorded for separate account liabilities.  Fee income accruing to the Company related to separate accounts is primarily included within Other revenues on the Consolidated Statements of Operations.A number of separate account pension deposit contracts guarantee principal and an annual minimum rate of interest.  If aggregate contract value in the separate account exceeds the fair value of the related assets, an additional Policyholders' funds liability is established.  During 2011, the Company increased this pretax Policyholders' funds liability by $18 million.  The Company decreased this pretax Policyholders' funds liability by $24 million and $42 million in 2010 and 2009.  Certain of these contracts are subject to a fair value adjustment if terminated by the policyholder.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Investments                                                              | InvestmentsValuation of investments:  The Company classifies its fixed maturity securities and its equity securities as either available-for-sale or trading, and as such, they are carried at fair value.  Changes in fair value of trading securities are reported within Net investment income on the Consolidated Statements of Operations.  Changes in fair value related to available-for-sale securities are reported as a component of Other comprehensive income.  The cost of fixed maturity securities classified as available-for-sale is adjusted for amortization of premiums and accretion of discounts to maturity, which are included in Net investment income on the Consolidated Statements of Operations.  Losses may be recognized within Net realized investment gains (losses) on the Consolidated Statements of Operations when a decline in value is determined by the Company to be other-than-temporary.To the extent that unrealized gains on fixed income securities supporting long term care products and payout annuity contracts would result in a premium deficiency if those gains were realized, a related decrease in Deferred acquisition costs and/or increase in Insurance reserves are recorded, net of tax, as a reduction of net unrealized gains through Other comprehensive income (Shadow Adjustments).  For the years ended December 31, 2011 and 2010, Shadow Adjustments, net of participating policyholders' interest, of $582 million and $150 million, were recorded, net of tax.  At December 31, 2011 and 2010, net unrealized gains on investments included in Accumulated other comprehensive income (AOCI) were correspondingly reduced by $732 million and $150 million.For asset-backed securities included in fixed maturity securities, the Company recognizes income using an effective yield based on anticipated prepayments and the estimated economic life of the securities.  When estimates of prepayments change, the effective yield is recalculated to reflect actual payments to date and anticipated future payments.  The amortized cost of high credit quality securities is adjusted to the amount that would have existed had the new effective yield been applied since the acquisition of the securities.  Such adjustments are reflected in Net investment income on the Consolidated Statements of Operations. Interest income on lower rated securities is determined using the prospective yield method.The Company's carrying value of investments in limited partnerships is its share of the net asset value of each partnership, as determined by the General Partner.  Certain partnerships for which results are not available on a timely basis are reported on a lag, primarily three months or less.  Changes in net asset values are accounted for under the equity method and recorded within Net investment income on the Consolidated Statements of Operations.Mortgage loans are commercial in nature and are carried at unpaid principal balance, net of unamortized fees and any valuation allowance.  Mortgage loans are considered to be impaired loans when it is probable that contractual principal and interest payments will not be collected.  A valuation allowance is established for impaired loans to the extent that the present value of expected future cash flows discounted at the loan's original effective interest rate is less than the carrying value of the loan.  Interest income from mortgage loans is recognized on an accrual basis using the effective yield method.  Accrual of income is generally suspended for mortgage loans that are impaired and collection of principal and interest payments is unlikely. Mortgage loans are considered past due when full principal or interest payments have not been received according to contractual terms.Other invested assets include certain derivative securities and securities containing embedded credit derivatives for which the fair value option was elected. Short term investments are carried at fair value.  Changes in fair value are reported as a component of Other comprehensive income.Realized investment gains (losses):  All securities sold resulting in investment gains and losses are recorded on the trade date, except for bank loan participations which are recorded on the date that the legal agreements are finalized.  Realized investment gains and losses are determined on the basis of the cost or amortized cost of the specific securities sold. |
| Income Taxes                                                             | Income TaxesThe Company and its eligible subsidiaries (CNA Tax Group) are included in the consolidated federal income tax return of Loews and its eligible subsidiaries.  The Company accounts for income taxes under the asset and liability method.  Under the asset and liability method, deferred income taxes are recognized for temporary differences between the financial statement and tax return bases of assets and liabilities, based on enacted tax rates and other provisions of the tax law.  The effect of a change in tax laws or rates on deferred tax assets and liabilities is recognized in income in the period in which such change is enacted.  Future tax benefits are recognized to the extent that realization of such benefits is more likely than not, and a valuation allowance is established for any portion of a deferred tax asset that management believes will not be realized.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Pension and Postretirement Benefits                                      | Pension and Postretirement BenefitsThe Company recognizes the overfunded or underfunded status of its defined benefit plans in Other assets or Other liabilities on the Consolidated Balance Sheets.  Changes in funded status related to prior service costs and credits and actuarial gains and losses are recognized in the year in which the changes occur through Other comprehensive income.  Annual service cost, interest cost, expected return on plan assets, amortization of prior service costs and credits, and amortization of actuarial gains and losses are recognized on the Consolidated Statements of Operations.  Effective January 1, 2009, due to the significant number of inactive participants in the plan, the Company amortizes actuarial gains/losses over the average remaining life expectancy of the inactive participants for the CNA Retirement Plan. Previously, the Company amortized actuarial gains/losses over the average remaining service period of the active participants.  This change resulted in an increase to net income of $20 million, net of taxes, for the year ended December 31, 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Stock-Based Compensation                                                 | Stock-Based CompensationThe Company records compensation expense using the fair value method for all awards it grants, modifies, repurchases or cancels primarily on a straight-line basis over the requisite service period, generally four years.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Foreign Currency                                                         | Foreign CurrencyForeign currency translation gains and losses are reflected in Stockholders' equity as a component of Accumulated other comprehensive income.  The Company's foreign subsidiaries' balance sheet accounts are translated at the exchange rates in effect at each year end and income statement accounts are either translated at the exchange rate on the date of the transaction or at the average exchange rates.  Foreign currency transaction gains (losses) of $4 million, $(19) million and $(14) million were included in determining net income (loss) for the years ended December 31, 2011, 2010 and 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Property and Equipment                                                   | Property and EquipmentProperty and equipment are carried at cost less accumulated depreciation.  Depreciation is based on the estimated useful lives of the various classes of property and equipment and is determined principally on the straight-line method.  Furniture and fixtures are depreciated over seven years.  Office equipment is depreciated over five years.  The estimated lives for data processing equipment and software range from three to five years.  Leasehold improvements are depreciated over the corresponding lease terms.  The Company's owned buildings, and related capital improvements, are depreciated over periods not to exceed fifty years.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Goodwill and Other Intangible Assets                                     | Goodwill and Other Intangible Assets Goodwill and other indefinite-lived intangible assets primarily represent the excess of purchase price over the fair value of the net assets of acquired entities and businesses.  Goodwill and indefinite-lived intangible assets are tested for impairment annually or when certain triggering events require such tests.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Earnings (Loss) Per Share Data                                           | Earnings (Loss) Per Share DataEarnings (loss) per share attributable to the Company's common stockholders is based on weighted average number of outstanding common shares.  Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing net income (loss) attributable to CNA by the weighted average number of common shares outstanding for the period.  Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.For the years ended December 31, 2011, 2010, and 2009, approximately 290 thousand, 380 thousand and 120 thousand potential shares attributable to exercises under stock-based employee compensation plans were included in the calculation of diluted earnings per share.  For those same periods, approximately 1.1 million, 1.2 million and 1.7 million potential shares attributable to exercises under stock-based employee compensation plans were not included in the calculation of diluted earnings per share because the effect would have been antidilutive.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Accounting Standards Updates                                             | Accounting Standards UpdatesAccounting standard to be adoptedAccounting for Costs Associated with Acquiring or Renewing Insurance ContractsIn October 2010, the Financial Accounting Standards Board issued updated accounting guidance that limits the capitalization of costs incurred to acquire or renew insurance contracts to those that are incremental direct costs of successful contract acquisitions.  The updated accounting guidance is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2011, with prospective or retrospective application allowed.  Effective January 1, 2012, the Company will adopt this updated accounting guidance retrospectively and estimates the cumulative effect as of December 31, 2011 will reduce Total CNA stockholders' equity by $70 million, after tax.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Derivative Securities                                                    | Derivative securities are recorded at fair value.  See Note D for information regarding the fair value of derivative securities.  Changes in the fair value of derivatives not associated with the trading portfolio are reported in Net realized investment gains (losses) on the Consolidated Statements of Operations.  Changes in the fair value of derivatives associated with the trading portfolio are reported in Net investment income on the Consolidated Statements of Operations.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |

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Disclosure of accounting policy for deferred policy acquisition costs, including the nature, type, and amount of capitalized costs incurred to write or acquire insurance contracts, and the basis for and methodologies applied in capitalizing and amortizing such costs.
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Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting.  The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.
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| - Definition
Disclosure of accounting policy for derivatives that either were not designated as hedging instruments or do not qualify for hedge accounting.
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Disclosure of accounting policy for any discontinued operations. The results of operations of a component of an entity that either has been disposed of or is classified as held for sale is reported in discontinued operations if both: (a) the operations and cash flows of the component have been (or will be) eliminated from the ongoing operations of the entity as a result of the disposal transaction and (b) the entity will not have any significant continuing involvement in the operations of the component after the disposal transaction. If the entity elects to allocate interest expense to a discontinued operation, it may disclose its accounting policy for this election and describe its method of allocation.
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Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.
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Disclosure of accounting policy for (1) transactions denominated in a currency other than the reporting enterprise's functional currency, (2) translating foreign currency financial statements that are incorporated into the financial statements of the reporting enterprise by consolidation, combination, or the equity method of accounting, and (3) remeasurement of the financial statements of a foreign reporting enterprise in a hyperinflationary economy.
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| - Definition
Disclosure of accounting policy for an insurance entity's net liability for future benefits (for example, death, cash surrender value) to be paid to or on behalf of policyholders, describing the bases, methodologies and components of the reserve, and assumptions regarding estimates of expected investment yields, mortality, morbidity, terminations and expenses.
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| - Definition
Disclosure of accounting policy for goodwill and intangible assets. This accounting policy also may address how an entity assesses and measures impairment of goodwill and intangible assets.
+ References
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| - Definition
Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.
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| - Definition
Disclosure of accounting policy for premium revenue recognition, including the basis for measurement and the timing of recognition of revenue from insurance premiums received from contract holders.
+ References
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| - Definition
Disclosure of accounting policy for investments in financial assets, including marketable securities (debt and equity securities with readily determinable fair values), investments accounted for under the equity method and cost method, securities borrowed and loaned, and repurchase and resale agreements. For marketable securities, the disclosure may include the entity's accounting treatment for transfers between investment categories and how the fair values for such securities are determined. Also, for all investments, an entity may describe its policy for assessing, recognizing and measuring impairment of the investment.
+ References
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| - Definition
The entire disclosure for life settlement contracts including the accounting policy for life settlement contracts and the classification of cash receipts and cash disbursements in the statement of cash flows and, as applicable, for (1) life settlement contracts accounted for under the investment method based on the remaining life expectancy for each of the first five succeeding years from the date of the statement of financial position and thereafter, as well as in the aggregate: (a) the number of life settlement contracts, (b) the carrying value of the life settlement contracts, and (c) the face value (death benefits) of the life insurance policies underlying the contracts, (d) the life insurance premiums anticipated to be paid for each of the five succeeding fiscal years to keep the life settlement contracts in force as of the date of the most recent statement of financial position presented, (e) the nature of the information that causes the Entity to change its expectations on the timing of the realization of proceeds from the investments in life settlement contracts and the related effect on the timing of the realization of proceeds from the life settlement contracts and for (2) life settlement contracts accounted for under the fair value method, disclosure would include, based on remaining life expectancy for each of the first five succeeding years from the date of the statement of financial position and thereafter, as well as in the aggregate: (a) the number of life settlement contracts, (b) the carrying value of the life settlement contracts, (c) the face value (death benefits) of the life insurance policies underlying the contracts, (d) the reasons for changes in the Entity's expectation of the timing of the realization of the investments in life settlement contracts, and (e) (i) the gains or losses recognized during the period on investments sold during the period and (ii) the unrealized gains or losses recognized during the period on investments that are still held at the date of the statement of financial position.
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| - Definition
Disclosure of accounting policy for pension and other postretirement benefit plans. This accounting policy may address (1) the types of plans sponsored by the entity, and the benefits provided by each plan (2) groups that participate in (or are covered by) each plan (3) how plan assets, liabilities and expenses are measured, including the use of any actuaries and (4) significant assumptions used by the entity to value plan assets and liabilities and how such assumptions are derived.
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| - Definition
Disclosure of accounting policy for contracts reported in separate accounts, including the extent and terms of minimum guarantees, basis of presentation for separate account assets and liabilities and related separate account activity, the liability valuation method and assumptions used in valuing each type of policyholder and contract holder account maintained by the entity.
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| - Definition
Disclosure of accounting policy for property, plant and equipment which may include the basis of such assets, depreciation methods used and estimated useful lives, the entity's capitalization policy, including its accounting treatment for costs incurred for repairs and maintenance activities, whether such asset balances include capitalized interest and the method by which such is calculated, how disposals of such assets are accounted for and how impairment of such assets is assessed and recognized.
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| - Definition
Disclosure of accounting policy for ceded reinsurance transactions on the financial statements, and description of the methodologies and assumptions underlying determination of reinsurance recoverables and reinsurance payables. If applicable, the assumptions pertaining to foreign-based reinsurance, and the nature and effect of material nonrecurring reinsurance transactions. May also state that the ceding insurer is not relieved of its primary obligation to policyholders.
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| - Definition
Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.
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| - Definition
Disclosure of accounting policy for estimating the ultimate cost of settling insurance claims relating to insured events that have occurred on or before a particular date (ordinarily, the statement of financial position date). The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claims adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims.
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| - Definition
Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.
+ References
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