| **Business Segments**                     | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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| **Segment Reporting [Abstract]**          | Â                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Segment Reporting Disclosure [Text Block] | 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 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 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, 2011CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating 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 costs164 180 6 —— 350Other insurance related expenses52 102 34 2 — 190Other expenses52 11 6 43 — 112Total claims, benefits and expenses686 916 378 39 — 2,019Operating income (loss) from continuing operations before income tax182 57 (46) (29) — 164Income tax (expense) benefit on operating income (loss)(64) (16) 27 11 — (42)Net operating (income) loss, after-tax, attributable to noncontrolling interests(4) (2) — — — (6)Net operating income (loss) from continuing operations attributable to CNA114 39 (19) (18) — 116Net 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$119 $47 $(18) $(22) $— $126Three months ended           June 30, 2010CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating revenues           Net earned premiums$665 $797 $146 $1 $(1) $1,608Net investment income125 184 174 38 — 521Other revenues53 16 2 4 — 75Total operating revenues843 997 322 43 (1) 2,204Claims, Benefits and Expenses           Net incurred claims and benefits320 486 314 17 — 1,137Policyholders’ dividends3 6 1 — — 10Amortization of deferred acquisition costs154 186 5 — — 345Other insurance related expenses47 107 45 (1) (1) 197Other expenses50 11 — 37 — 98Total claims, benefits and expenses574 796 365 53 (1) 1,787Operating income (loss) from continuing operations before income tax269 201 (43) (10) — 417Income tax (expense) benefit on operating income (loss)(90) (68) 25 4 — (129)Net operating (income) loss, after-tax, attributable to noncontrolling interests(11) (8) — — — (19)Net operating income (loss) from continuing operations attributable to CNA168 125 (18) (6) — 269Net realized investment gains (losses), net of participating policyholders’ interests32 (12) (1) 10 — 29Income tax (expense) benefit on net realized investment gains (losses)(11) (2) — (3) — (16)Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— — — — — —Net realized investment gains (losses) attributable to CNA21 (14) (1) 7 — 13Net income (loss) from continuing operations attributable to CNA$189 $111 $(19) $1 $— $282Six months ended           June 30, 2011CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating 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 costs325 358 12 — — 695Other insurance related expenses96 185 72 3 (1) 355Other expenses92 27 12 87 — 218Total claims, benefits and expenses1,361 1,796 752 91 (1) 3,999Operating income (loss) from continuing operations before income tax390 254 (90) (68) — 486Income tax (expense) benefit on operating income (loss)(134) (82) 53 23 — (140)Net operating (income) loss, after-tax, attributable to noncontrolling interests(12) (2) — — — (14)Net operating income (loss) from continuing operations attributable to CNA244 170 (37) (45) — 332Net 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$254 $188 $(39) $(53) $— $350June 30, 2011           (In millions)           Reinsurance receivables$916 $1,890 $1,423 $2,698 $— $6,927Insurance receivables$631 $1,197 $8 $4 $— $1,840Deferred acquisition costs$345 $338 $423 $— $— $1,106Insurance reserves      Claim and claim adjustment expenses$6,953 $12,282 $2,734 $3,227 $— $25,196Unearned premiums1,635 1,632 143 — (1) 3,409Future policy benefits— — 9,021 — — 9,021Policyholders’ funds14 10 142 — — 166Six months ended           June 30, 2010CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalOperating revenues           Net earned premiums$1,319 $1,613 $291 $2 $(2) $3,223Net investment income272 405 349 85 — 1,111Other revenues105 34 6 6 — 151Total operating revenues1,696 2,052 646 93 (2) 4,485Claims, Benefits and Expenses           Net incurred claims and benefits722 1,090 595 36 — 2,443Policyholders’ dividends4 7 1 — — 12Amortization of deferred acquisition costs309 369 9 — — 687Other insurance related expenses94 214 96 1 (2) 403Other expenses94 28 6 72 — 200Total claims, benefits and expenses1,223 1,708 707 109 (2) 3,745Operating income (loss) from continuing operations before income tax473 344 (61) (16) — 740Income tax (expense) benefit on operating income (loss)(158) (111) 44 6 — (219)Net operating (income) loss, after-tax, attributable to noncontrolling interests(19) (10) — — — (29)Net operating income (loss) from continuing operations attributable to CNA296 223 (17) (10) — 492Net realized investment gains (losses), net of participating policyholders’ interests45 9 (5) 14 — 63Income tax (expense) benefit on net realized investment gains (losses)(15) (9) — (4) — (28)Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— — — — — —Net realized investment gains (losses) attributable to CNA30 — (5) 10 — 35Net income (loss) from continuing operations attributable to CNA$326 $223 $(22) $— $— $527December 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 June 30Three Months Six Months(In millions)2011 2010 2011 2010CNA Specialty       International$54 $48 $105 $99Professional & Management Liability626 634 1,286 1,265Surety119 119 230 233Warranty & Alternative Risks76 74 145 144CNA Specialty revenues875 875 1,766 1,741CNA Commercial       CNA Select Risk67 62 138 126Commercial Insurance641 694 1,393 1,410International130 89 257 244Small Business146 140 290 281CNA Commercial revenues984 985 2,078 2,061Life & Group Non-Core       Health274 266 544 520Life & Annuity59 52 115 116Other— 3 — 5Life & Group Non-Core revenues333 321 659 641Corporate & Other Non-Core revenues6 53 11 107Eliminations— (1) (1) (2)Total revenues$2,198 $2,233 $4,513 $4,548 |

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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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