| **Business Segments**            | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| **Segment Reporting [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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| Business Segments                | 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, 2010.  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 intrasegment 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 interest rate, 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           September 30, 2011CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating revenues           Net earned premiums$741 $848 $142 $2 $(1) $1,732Net investment income85 115 190 4 — 394Other revenues56 14 6 — — 76Total operating revenues882 977 338 6 (1) 2,202Claims, Benefits and Expenses           Net incurred claims and benefits485 583 332 (1) — 1,399Policyholders’ dividends(4) 3 2 — — 1Amortization of deferred acquisition costs170 181 5 —— 356Other insurance related expenses51 106 36 1 (1) 193Other expenses48 10 2 42 — 102Total claims, benefits and expenses750 883 377 42 (1) 2,051Operating income (loss) from continuing operations before income tax132 94 (39) (36) — 151Income tax (expense) benefit on operating income (loss)(48) (47) 25 11 — (59)Net operating (income) loss, after-tax, attributable to noncontrolling interests— (1) — — — (1)Net operating income (loss) from continuing operations attributable to CNA84 46 (14) (25) — 91Net realized investment losses, net of participating policyholders’ interests(8) (15) (4) — — (27)Income tax benefit on net realized investment losses3 5 1 1 — 10Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— 1 — — — 1Net realized investment gains (losses) attributable to CNA(5) (9) (3) 1 — (16)Net income (loss) from continuing operations attributable to CNA$79 $37 $(17) $(24) $— $75Three months ended           September 30, 2010CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating revenues           Net earned premiums$679 $819 $145 $3 $(1) $1,645Net investment income148 216 182 35 — 581Other revenues57 15 4 (1) — 75Total operating revenues884 1,050 331 37 (1) 2,301Claims, Benefits and Expenses           Net incurred claims and benefits393 578 354 12 — 1,337Policyholders’ dividends2 4 1 — — 7Amortization of deferred acquisition costs162 183 6 — — 351Other insurance related expenses45 104 41 9 (1) 198Other expenses47 14 7 569 — 637Total claims, benefits and expenses649 883 409 590 (1) 2,530Operating income (loss) from continuing operations before income tax235 167 (78) (553) — (229)Income tax (expense) benefit on operating income (loss)(80) (54) 23 198 — 87Net operating (income) loss, after-tax, attributable to noncontrolling interests(11) (5) — — — (16)Net operating income (loss) from continuing operations attributable to CNA144 108 (55) (355) — (158)Net realized investment gains, net of participating policyholders’ interests15 21 20 6 — 62Income tax expense on net realized investment gains(6) (8) (7) (2) — (23)Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— 1 — — — 1Net realized investment gains attributable to CNA9 14 13 4 — 40Net income (loss) from continuing operations attributable to CNA$153 $122 $(42) $(351) $— $(118)Nine months ended           September 30, 2011CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating revenues           Net earned premiums$2,098 $2,418 $427 $1 $(2) $4,942Net investment income371 569 567 24 — 1,531Other revenues164 40 6 4 — 214Total operating revenues2,633 3,027 1,000 29 (2) 6,687Claims, Benefits and Expenses           Net incurred claims and benefits1,333 1,807 985 — — 4,125Policyholders’ dividends(4) 5 5 — — 6Amortization of deferred acquisition costs495 539 17 — — 1,051Other insurance related expenses147 291 108 4 (2) 548Other expenses140 37 14 129 — 320Total claims, benefits and expenses2,111 2,679 1,129 133 (2) 6,050Operating income (loss) from continuing operations before income tax522 348 (129) (104) — 637Income tax (expense) benefit on operating income (loss)(182) (129) 78 34 — (199)Net operating (income) loss, after-tax, attributable to noncontrolling interests(12) (3) — — — (15)Net operating income (loss) from continuing operations attributable to CNA328 216 (51) (70) — 423Net realized investment gains (losses), net of participating policyholders’ interests7 13 (7) (12) — 1Income tax (expense) benefit on net realized investment gains (losses)(2) (4) 2 5 — 1Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— — — — — —Net realized investment gains (losses) attributable to CNA5 9 (5) (7) — 2Net income (loss) from continuing operations attributable to CNA$333 $225 $(56) $(77) $— $425September 30, 2011           (In millions)           Reinsurance receivables$874 $1,850 $1,411 $2,687 $— $6,822Insurance receivables$650 $1,161 $8 $9 $— $1,828Deferred acquisition costs$351 $338 $94 $— $— $783Insurance reserves           Claim and claim adjustment expenses$7,000 $12,116 $2,748 $3,167 $— $25,031Unearned premiums1,639 1,604 144 — (1) 3,386Future policy benefits— — 9,258 — — 9,258Policyholders’ funds16 10 150 — — 176Nine months ended           September 30, 2010CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating revenues           Net earned premiums$1,998 $2,432 $436 $5 $(3) $4,868Net investment income420 621 531 120 — 1,692Other revenues162 49 10 5 — 226Total operating revenues2,580 3,102 977 130 (3) 6,786Claims, Benefits and Expenses           Net incurred claims and benefits1,115 1,668 949 48 — 3,780Policyholders’ dividends6 11 2 — — 19Amortization of deferred acquisition costs471 552 15 — — 1,038Other insurance related expenses139 318 137 10 (3) 601Other expenses141 42 13 641 — 837Total claims, benefits and expenses1,872 2,591 1,116 699 (3) 6,275Operating income (loss) from continuing operations before income tax708 511 (139) (569) — 511Income tax (expense) benefit on operating income (loss)(238) (165) 67 204 — (132)Net operating (income) loss, after-tax, attributable to noncontrolling interests(30) (15) — — — (45)Net operating income (loss) from continuing operations attributable to CNA440 331 (72) (365) — 334Net realized investment gains, net of participating policyholders’ interests60 30 15 20 — 125Income tax expense on net realized investment gains(21) (17) (7) (6) — (51)Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— 1 — — — 1Net realized investment gains attributable to CNA39 14 8 14 — 75Net income (loss) from continuing operations attributable to CNA$479 $345 $(64) $(351) $— $409December 31, 2010           (In millions)           Reinsurance receivables$906 $1,973 $1,502 $2,823 $— $7,204Insurance receivables$654 $1,050 $9 $4 $— $1,717Deferred acquisition costs$330 $315 $434 $— $— $1,079Insurance reserves      Claim and claim adjustment expenses$6,793 $12,522 $2,739 $3,442 $— $25,496Unearned premiums1,543 1,526 132 2 — 3,203Future policy benefits— — 8,718 — — 8,718Policyholders’ funds16 13 144 — — 173The 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 September 30Three Months Nine Months(In millions)2011 2010 2011 2010CNA Specialty       International$54 $51 $159 $150Professional & Management Liability623 650 1,909 1,915Surety123 124 353 357Warranty & Alternative Risks74 74 219 218CNA Specialty revenues874 899 2,640 2,640CNA Commercial       CNA Select Risk65 69 203 195Commercial Insurance622 737 2,015 2,147International133 123 390 367Small Business142 142 432 423CNA Commercial revenues962 1,071 3,040 3,132Life & Group Non-Core       Health274 276 818 796Life & Annuity55 69 170 185Other5 6 5 11Life & Group Non-Core revenues334 351 993 992Corporate & Other Non-Core revenues6 43 17 150Eliminations(1) (1) (2) (3)Total revenues$2,175 $2,363 $6,688 $6,911 |

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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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