| **Business Segments**            | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| **Segment Reporting [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Business Segments                | Note J. Business SegmentsThe Company's core property and casualty commercial insurance operations are reported in two business segments:  CNA Specialty and CNA Commercial.  The Company's non-core operations are managed in two segments: Life & Group Non-Core and Corporate & Other Non-Core.The accounting policies of the segments are the same as those described in Note A of the Consolidated Financial Statements within CNAF's Annual Report on Form 10-K for the year ended December 31, 2011, other than the accounting for deferred acquisition costs, as further discussed in Note A herein.  The Company manages most of its assets on a legal entity basis, while segment operations are conducted across legal entities.  As such, only insurance and reinsurance receivables, insurance reserves and deferred acquisition costs are readily identifiable by individual segment.  Distinct investment portfolios are not maintained for each individual segment; accordingly, allocation of assets to each segment is not performed.  Therefore, net investment income and realized investment gains or losses are allocated primarily based on each segment's net carried insurance reserves, as adjusted.  All significant intersegment income and expense has been eliminated.  Income taxes have been allocated on the basis of the taxable income of the segments.In the following tables, certain financial measures are presented to provide information used by management to monitor the Company's operating performance.  Management utilizes these financial measures to monitor the Company's insurance operations and investment portfolio.  Net operating income, which is derived from certain income statement amounts, is used by management to monitor performance of the Company's insurance operations.  The Company's investment portfolio is monitored by management through analysis of various factors including unrealized gains and losses on securities, portfolio duration and exposure to market and credit risk.  Based on such analyses, the Company may recognize an OTTI loss on an investment security in accordance with its policy, or sell a security, which may produce realized gains and losses.Net operating income (loss) is calculated by excluding from net income (loss) attributable to CNA the after-tax effects of 1) net realized investment gains or losses, 2) income or loss from discontinued operations and 3) any cumulative effects of changes in accounting guidance.  The calculation of net operating income excludes net realized investment gains or losses because net realized investment gains or losses are largely discretionary, except for some losses related to OTTI, and are generally driven by economic factors that are not necessarily consistent with key drivers of underwriting performance, and are therefore not considered an indication of trends in insurance operations.The significant components of the Company's continuing operations and selected balance sheet items are presented in the following tables.Three months ended           June 30, 2012CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating revenues           Net earned premiums$719 $809 $139 $2 $(1) $1,668Net investment income112 151 201 6 — 470Other revenues57 11 16 2 — 86Total operating revenues888 971 356 10 (1) 2,224Claims, Benefits and Expenses           Net incurred claims and benefits448 591 323 (20) — 1,342Policyholders’ dividends1 3 2 — — 6Amortization of deferred acquisition costs154 147 8 — — 309Other insurance related expenses77 135 36 1 (1) 248Other expenses50 10 4 47 — 111Total claims, benefits and expenses730 886 373 28 (1) 2,016Operating income (loss) from continuing operations before income tax158 85 (17) (18) — 208Income tax (expense) benefit on operating income (loss)(52) (28) 20 4 — (56)Net operating income (loss) from continuing operations attributable to CNA106 57 3 (14) — 152Net realized investment gains (losses), net of participating policyholders’ interests8 13 4 (3) — 22Income tax (expense) benefit on net realized investment gains (losses)(2) (5) (1) — — (8)Net realized investment gains (losses) attributable to CNA6 8 3 (3) — 14Net income (loss) from continuing operations attributable to CNA$112 $65 $6 $(17) $— $166Three months ended           June 30, 2011CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core   Total(In millions)    Eliminations Operating revenues           Net earned premiums$688 $768 $141 $(2) $— $1,595Net investment income126 193 189 9 — 517Other revenues54 12 2 3 — 71Total operating revenues868 973 332 10 — 2,183Claims, Benefits and Expenses           Net incurred claims and benefits418 621 330 (6) — 1,363Policyholders’ dividends— 2 2 — — 4Amortization of deferred acquisition costs138 142 6 — — 286Other insurance related expenses77 144 34 2 — 257Other expenses52 11 6 43 — 112Total claims, benefits and expenses685 920 378 39 — 2,022Operating income (loss) from continuing operations before income tax183 53 (46) (29) — 161Income tax (expense) benefit on operating income (loss)(64) (16) 27 11 — (42)Net operating (income) loss, after-tax, attributable to noncontrolling interests(4) (1) — — — (5)Net operating income (loss) from continuing operations attributable to CNA115 36 (19) (18) — 114Net realized investment gains (losses), net of participating policyholders’ interests7 11 1 (4) — 15Income tax (expense) benefit on net realized investment gains (losses)(2) (3) — — — (5)Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— — — — — —Net realized investment gains (losses) attributable to CNA5 8 1 (4) — 10Net income (loss) from continuing operations attributable to CNA$120 $44 $(18) $(22) $— $124Six months ended           June 30, 2012CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating revenues           Net earned premiums$1,425 $1,612 $280 $1 $(1) $3,317Net investment income287 416 399 16 — 1,118Other revenues113 20 14 7 — 154Total operating revenues1,825 2,048 693 24 (1) 4,589Claims, Benefits and Expenses           Net incurred claims and benefits916 1,158 659 (13) — 2,720Policyholders’ dividends(1) 6 4 — — 9Amortization of deferred acquisition costs302 286 16 — — 604Other insurance related expenses149 279 71 — (1) 498Other expenses100 17 10 95 — 222Total claims, benefits and expenses1,466 1,746 760 82 (1) 4,053Operating income (loss) from continuing operations before income tax359 302 (67) (58) — 536Income tax (expense) benefit on operating income (loss)(121) (106) 51 18 — (158)Net operating income (loss) from continuing operations attributable to CNA238 196 (16) (40) — 378Net realized investment gains (losses), net of participating policyholders’ interests16 24 17 1 — 58Income tax (expense) benefit on net realized investment gains (losses)(4) (9) (6) (1) — (20)Net realized investment gains (losses) attributable to CNA12 15 11 — — 38Net income (loss) from continuing operations attributable to CNA$250 $211 $(5) $(40) $— $416June 30, 2012           (In millions)           Reinsurance receivables$837 $1,149 $1,323 $2,513 $— $5,822Insurance receivables$711 $1,182 $8 $3 $— $1,904Deferred acquisition costs$308 $276 $— $— $— $584Insurance reserves          Claim and claim adjustment expenses$6,925 $11,316 $2,901 $2,865 $— $24,007Unearned premiums1,708 1,626 145 — (1) 3,478Future policy benefits— — 10,352 — — 10,352Policyholders’ funds13 13 141 — — 167Six months ended           June 30, 2011CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core   Total(In millions)    Eliminations Operating revenues           Net earned premiums$1,357 $1,570 $285 $(1) $(1) $3,210Net investment income286 454 377 20 — 1,137Other revenues108 26 — 4 — 138Total operating revenues1,751 2,050 662 23 (1) 4,485Claims, Benefits and Expenses           Net incurred claims and benefits848 1,224 653 1 — 2,726Policyholders’ dividends— 2 3 — — 5Amortization of deferred acquisition costs281 290 12 — — 583Other insurance related expenses141 259 72 3 (1) 474Other expenses92 27 12 87 — 218Total claims, benefits and expenses1,362 1,802 752 91 (1) 4,006Operating income (loss) from continuing operations before income tax389 248 (90) (68) — 479Income tax (expense) benefit on operating income (loss)(134) (81) 53 23 — (139)Net operating (income) loss, after-tax, attributable to noncontrolling interests(12) (1) — — — (13)Net operating income (loss) from continuing operations attributable to CNA243 166 (37) (45) — 327Net realized investment gains (losses), net of participating policyholders’ interests15 28 (3) (12) — 28Income tax (expense) benefit on net realized investment gains (losses)(5) (9) 1 4 — (9)Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— (1) — — — (1)Net realized investment gains (losses) attributable to CNA10 18 (2) (8) — 18Net income (loss) from continuing operations attributable to CNA$253 $184 $(39) $(53) $— $345December 31, 2011           (In millions)           Reinsurance receivables$852 $1,188 $1,375 $2,677 $— $6,092Insurance receivables$670 $1,047 $8 $1 $— $1,726Deferred acquisition costs$300 $252 $— $— $— $552Insurance reserves           Claim and claim adjustment expenses$6,840 $11,509 $2,825 $3,129 $— $24,303Unearned premiums1,629 1,480 141 — — 3,250Future policy benefits— — 9,810 — — 9,810Policyholders’ funds15 10 166 — — 191The following table provides revenue by line of business for each reportable segment. Revenues are comprised of operating revenues and net realized investment gains and losses, net of participating policyholders’ interests.Revenues by Line of BusinessPeriods ended June 30Three Months Six Months(In millions)2012 2011 2012 2011CNA Specialty       International$53 $54 $110 $105Professional & Management Liability645 626 1,339 1,286Surety121 119 240 230Warranty & Alternative Risks77 76 152 145CNA Specialty revenues896 875 1,841 1,766CNA Commercial       CNA Select Risk66 67 139 138Commercial Insurance670 641 1,432 1,393International90 130 181 257Small Business158 146 320 290CNA Commercial revenues984 984 2,072 2,078Life & Group Non-Core      Health287 274 578 544Life & Annuity57 59 117 115Other16 — 15 —Life & Group Non-Core revenues360 333 710 659Corporate & Other Non-Core revenues7 6 25 11Eliminations(1) — (1) (1)Total revenues$2,246 $2,198 $4,647 $4,513 |

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| - Definition
The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.
+ References
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