| **Benefit Plans (Tables)**                                                                                                                          | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| **Compensation and Retirement Disclosure [Abstract]**                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Funded status                                                                                                                                       | The following table provides a reconciliation of benefit obligations and plan assets for the years ended December 31, 2012 and 2011.Funded Status Pension Benefits Postretirement Benefits(In millions)2012 2011 2012 2011Benefit obligation at January 1$3,003 $2,798 $49 $95Changes in benefit obligation:       Service cost12 13 — 1Interest cost135 146 2 3Participants' contributions— — 5 6Plan amendments— — — (12)Actuarial (gain) loss266 263 3 (18)Benefits paid(164) (163) (12) (13)Foreign currency translation and other19 — — —Reduction of benefit obligations due to disposition of subsidiary— (54) — (13)Benefit obligation at December 313,271 3,0034749Fair value of plan assets at January 12,212 2,258 — —Change in plan assets:       Actual return on plan assets245 82 — —Company contributions115 89 7 7Participants' contributions— — 5 6Benefits paid(164) (163) (12) (13)Foreign currency translation and other17 — — —Reduction of plan assets due to disposition of subsidiary— (54) — —Fair value of plan assets at December 312,425 2,212 — —Funded status$(846) $(791) $(47) $(49)Amounts recognized on the Consolidated Balance Sheets at December 31:       Other assets$— $1 $— $—Other liabilities(846) (792) (47) (49)Net amount recognized$(846) $(791) $(47) $(49)Amounts recognized in Accumulated other comprehensive income, not yet recognized in net periodic cost (benefit):       Prior service credit$— $— $(116) $(134)Net actuarial loss1,213 1,060 11 9Net amount recognized$1,213 $1,060 $(105) $(125)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Components of net periodic cost (benefit)                                                                                                           | Net Periodic Cost (Benefit)Years ended December 31     (In millions)2012 2011 2010Pension cost (benefit)     Service cost$12 $13 $16Interest cost on projected benefit obligation135 146 149Expected return on plan assets(171) (172) (162)Amortization of net actuarial (gain) loss39 25 24Net periodic pension cost (benefit)$15 $12 $27      Postretirement cost (benefit)     Service cost$— $1 $1Interest cost on projected benefit obligation2 3 7Amortization of prior service credit(18) (19) (16)Amortization of net actuarial (gain) loss1 — 1Net periodic postretirement cost (benefit)$(15) $(15) $(7)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Schedule of amounts recognized in Other comprehensive income                                                                                        | The amounts recognized in Other comprehensive income are presented in the following table.Years ended December 31     (In millions)2012 2011 2010Pension and postretirement benefits     Amounts arising during the period$(195) $(325) $44Reclassification adjustment relating to prior service credit(18) (19) (16)Reclassification adjustment relating to actuarial loss40 25 25Total increase (decrease) in Other comprehensive income$(173) $(319) $53                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Schedule of estimated amounts to be recognized from Accumulated other comprehensive income into net periodic cost (benefit) during next fiscal year | The table below presents the estimated amounts to be recognized from Accumulated other comprehensive income into net periodic cost (benefit) during 2013.(In millions) PensionBenefits Postretirement BenefitsAmortization of prior service credit $— $(18)Amortization of net actuarial loss 47 1Total estimated amounts to be recognized $47 $(17)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Actuarial assumptions for benefit obligations and for net cost or benefit                                                                           | Actuarial assumptions used for the CNA Retirement Plan and CNA Health and Group Benefits Program to determine benefit obligations are set forth in the following table.Actuarial Assumptions for Benefit ObligationsDecember 312012 2011Pension benefits   Discount rate3.800% 4.600%Expected long term rate of return7.750 8.000Rate of compensation increases4.066 4.125Postretirement benefits   Discount rate2.800% 3.750%Actuarial assumptions used for the CNA Retirement Plan and CNA Health and Group Benefits Program to determine net cost or benefit are set forth in the following table.Actuarial Assumptions for Net Cost or BenefitYears ended December 312012 2011 2010Pension benefits     Discount rate4.600% 5.375% 5.700%Expected long term rate of return8.000 8.000 8.000Rate of compensation increases4.125 5.030 5.030Postretirement benefits     Discount rate3.750% 4.375% 4.875 / 5.500%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Fair value of plan assets measured on a recurring basis                                                                                             | Pension plan assets measured at fair value on a recurring basis are summarized below. December 31, 2012        (In millions) Level 1 Level 2 Level 3 Total Assets at Fair ValueAssets        Fixed maturity securities:        Corporate and other bonds $— $436 $11 $447States, municipalities and political subdivisions — 91 — 91Asset-backed:        Residential mortgage-backed — 161 — 161Commercial mortgage-backed — 105 — 105Total asset-backed — 266 — 266Total fixed maturity securities — 793 11 804Equity securities 386 102 5 493Derivative financial instruments 1 — — 1Short term investments 37 82 — 119Limited partnerships:        Hedge funds — 537 359 896Private equity — — 62 62Total limited partnerships — 537 421 958Other assets — 40 — 40Investment contracts with insurance company — — 10 10Total assets $424 $1,554 $447 $2,425December 31, 2011        (In millions) Level 1 Level 2 Level 3 Total Assets at Fair ValueAssets        Fixed maturity securities:        Corporate and other bonds $— $377 $10 $387States, municipalities and political subdivisions — 104 — 104Asset-backed:        Residential mortgage-backed — 198 — 198Commercial mortgage-backed — 68 — 68Other asset-backed — 10 — 10Total asset-backed — 276 — 276Total fixed maturity securities — 757 10 767Equity securities 353 75 5 433Short term investments 63 35 — 98Limited partnerships:        Hedge funds — 488 330 818Private equity — — 65 65Total limited partnerships — 488 395 883Other assets — 21 — 21Investment contracts with insurance company — — 10 10Total assets $416 $1,376 $420 $2,212 |
| Reconciliation of level 3 plan assets                                                                                                               | The tables below present a reconciliation for all pension plan assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the years ended December 31, 2012 and 2011.Level 3(In millions)Balance at January 1, 2012 Actual return on assets still held at December 31, 2012 Actual return on assets sold during the year ended December 31, 2012 Purchases, sales, and settlements Net transfers into (out of) Level 3 Balance at December 31, 2012Fixed maturity securities:           Corporate and other bonds$10 $1 $— $— $— $11Equity securities5 — — — — 5Limited partnerships:           Hedge funds330 41 3 (15) — 359Private equity65 8 — (11) — 62Total limited partnerships395 49 3 (26) — 421Investment contracts with insurance company10 — — — — 10Total$420 $50 $3 $(26) $— $447Level 3(In millions)Balance at January 1, 2011 Actual return on assets still held at December 31, 2011 Actual return on assets sold during the year ended December 31, 2011 Purchases, sales, and settlements Net transfers into (out of) Level 3 Balance at December 31, 2011Fixed maturity securities:           Corporate and other bonds$10 $— $— $— $— $10Asset-backed:           Commercial mortgage-backed9 — — (9) — —Other asset-backed1 — — (1) — —Total asset-backed10 — — (10) — —Total fixed maturity securities20 — — (10) — 10Equity securities6 (1) — — — 5Limited partnerships:           Hedge funds394 5 5 (74) — 330Private equity59 9 — (3) — 65Total limited partnerships453 14 5 (77) — 395Investment contracts with insurance company9 1 — — — 10Total$488 $14 $5 $(87) $— $420                                                                                                                                                                                                                             |
| Estimated future minimum benefit payments to participants                                                                                           | Estimated Future Minimum Benefit Payments to Participants(In millions)Pension Benefits Postretirement Benefits2013$186 $62014187 52015193 52016194 52017200 52018-20221,024 16                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Significant assumptions used to estimate fair value of stock options and SARS                                                                       | The following table presents the significant assumptions used to estimate the fair value of granted stock options and SARs for the years ended December 31, 2012, 2011 and 2010.Years ended December 312012 2011 2010Weighted average expected life of the securities granted (in years)5.68 5.61 5.61Estimate of the underlying common stock's volatility40.39% 39.88% 39.58%Expected dividend yield2.1% 1.5% —%Risk free interest rate1.0% 2.2% 2.6%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Stock option and SARS activity                                                                                                                      | The following table presents activity for stock options and SARs under the Plan in 2012.  Number of Awards Weighted-Average Exercise Price per Award Aggregate Intrinsic Value Weighted-Average Remaining Contractual Term (in years)Outstanding at January 1, 2012 1,319,350 $26.01    Awards granted 10,000 28.32    Awards exercised (62,450) 20.56    Awards forfeited, canceled or expired (108,200) 30.14    Outstanding at December 31, 2012 1,158,700 $25.93 $5 million 4.98Outstanding, fully vested and expected to vest 1,134,399 $25.93 $5 million 4.92Outstanding, exercisable 917,700 $26.79 $4 million 4.38                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Weighted-average grant date fair value for awards granted, total intrinsic value for awards exercised and total fair value for awards vested        | The following table presents weighted-average grant date fair value for awards granted, total intrinsic value for awards exercised and total fair value for awards vested for the years ended December 31, 2012, 2011 and 2010.Years ended December 312012 2011 2010Weighted-average grant date fair value$8.81 $9.38 $10.49Total intrinsic value of awards exercised$548 thousand $481 thousand $350 thousandFair value of awards vested$1 million $2 million $2 million                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Restricted shares, performance-based restricted stock units and performance share unit activity                                                     | The following table presents activity for restricted shares, performance-based RSUs and performance share units under the Plan in 2012. Number of Awards Weighted-Average Grant Date Fair ValueBalance at January 1, 2012639,422 $23.55Awards granted386,353 28.37Awards vested(140,299) 19.71Awards forfeited, canceled or expired(16,623) 27.27Performance-based adjustment13,468 26.79Balance at December 31, 2012882,321 $26.15                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |

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| - Definition
Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans.  This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.
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| - Definition
Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.
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| - Definition
Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost.
+ References
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| - Definition
Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.
+ References
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| - Definition
Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period.
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| - Definition
Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.
+ References
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| - Definition
Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.
+ References
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| - Definition
Tabular disclosure of net funded status of pension plans and/or other employee benefit plans.
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| - Definition
Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year.
+ References
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| - Definition
Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.
+ References
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| - Definition
Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.
+ References
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| - Definition
Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.
+ References
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