| **Business Segments**            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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| **Segment Reporting [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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| Business Segments                | Note N. Business SegmentsThe Company's core property and casualty commercial insurance operations are reported in two business segments:  CNA Specialty and CNA Commercial.  CNA Specialty provides a broad array of professional, financial and specialty property and casualty products and services, primarily through insurance brokers and managing general underwriters. CNA Commercial includes property and casualty coverages sold to small businesses and middle market entities and organizations primarily through an independent agency distribution system.  CNA Commercial also includes commercial insurance and risk management products sold to large corporations primarily through insurance brokers.The Company's non-core operations are managed in two segments: Life & Group Non-Core and Corporate & Other Non-Core.  Life & Group Non-Core primarily includes the results of the life and group lines of business that are in run-off.  Corporate & Other Non-Core primarily includes certain corporate expenses, including interest on corporate debt, and the results of certain property and casualty business in run-off, including CNA Re and A&EP.  The accounting policies of the segments are the same as those described in Note A.  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.Approximately 8.8%, 6.9% and 7.0% of the Company's direct written premiums were derived from outside the United States for the years ended December 31, 2011, 2010 and 2009.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.Year ended December 31, 2011CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalNet written premiums (a)$2,872 $3,350 $577 $2 $(3) $6,798Operating revenues           Net earned premiums$2,796 $3,240 $569 $1 $(3) $6,603Net investment income500 763 759 32 — 2,054Other revenues221 54 13 6 — 294Total operating revenues3,517 4,057 1,341 39 (3) 8,951Claims, Benefits and Expenses           Net incurred claims and benefits1,657 2,296 1,526 (3) — 5,476Policyholders’ dividends(3) 8 8 — — 13Amortization of deferred acquisition costs663 725 22 — — 1,410Other insurance related expenses197 395 143 6 (3) 738Other expenses191 53 19 170 — 433Total claims, benefits and expenses2,705 3,477 1,718 173 (3) 8,070Operating income (loss) from continuing operations before income tax812 580 (377) (134) — 881Income tax (expense) benefit on operating income (loss)(281) (207) 169 68 — (251)Net operating (income) loss, after-tax, attributable to noncontrolling interests(12) (4) — — — (16)Net operating income (loss) from continuing operations attributable to CNA519 369 (208) (66) — 614Net realized investment gains (losses), net of participating policyholders’ interests(5) 14 (7) (6) — (4)Income tax (expense) benefit on net realized investment gains (losses)2 (2) 2 3 — 5Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— — — — — —Net realized investment gains (losses) attributable to CNA(3) 12 (5) (3) — 1Net income (loss) from continuing operations attributable to CNA$516 $381 $(213) $(69) $— $615(a) Related to business in property and casualty companies only.December 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$347 $311 $— $— $— $658Insurance 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 — — 191Year ended December 31, 2010CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalNet written premiums (a)$2,691 $3,208 $573 $2 $(3) $6,471Operating revenues           Net earned premiums$2,679 $3,256 $582 $1 $(3) $6,515Net investment income591 873 715 137 — 2,316Other revenues216 61 7 8 — 292Total operating revenues3,486 4,190 1,304 146 (3) 9,123Claims, Benefits and Expenses           Net incurred claims and benefits1,447 2,175 1,275 58 — 4,955Policyholders’ dividends12 14 4 — — 30Amortization of deferred acquisition costs631 736 20 — — 1,387Other insurance related expenses186 424 180 10 (3) 797Other expenses190 55 2 681 — 928Total claims, benefits and expenses2,466 3,404 1,481 749 (3) 8,097Operating income (loss) from continuing operations before income tax1,020 786 (177) (603) — 1,026Income tax (expense) benefit on operating income (loss)(343) (260) 90 216 — (297)Net operating (income) loss, after-tax, attributable to noncontrolling interests(52) (17) — — — (69)Net operating income (loss) from continuing operations attributable to CNA625 509 (87) (387) — 660Net realized investment gains (losses), net of participating policyholders’ interests30 (15) 53 18 — 86Income tax (expense) benefit on net realized investment gains (losses)(10) (1) (20) (5) — (36)Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests— 1 — — — 1Net realized investment gains (losses) attributable to CNA20 (15) 33 13 — 51Net income (loss) from continuing operations attributable to CNA$645 $494 $(54) $(374) $— $711(a) Related to business in property and casualty companies only.December 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 — — 173Year ended December 31, 2009CNASpecialty CNACommercial Life &GroupNon-Core Corporate& OtherNon-Core    (In millions)    Eliminations TotalNet written premiums (a)$2,684 $3,448 $583 $1 $(3) $6,713Operating revenues           Net earned premiums$2,697 $3,432 $595 $— $(3) $6,721Net investment income526 935 664 195 — 2,320Other revenues206 61 11 10 — 288Total operating revenues3,429 4,428 1,270 205 (3) 9,329Claims, Benefits and Expenses           Net incurred claims and benefits1,536 2,420 1,084 227 — 5,267Policyholders’ dividends9 9 5 — — 23Amortization of deferred acquisition costs624 775 18 — — 1,417Other insurance related expenses163 435 183 3 (3) 781Other expenses179 77 69 119 — 444Total claims, benefits and expenses2,511 3,716 1,359 349 (3) 7,932Operating income (loss) from continuing operations before income tax918 712 (89) (144) — 1,397Income tax (expense) benefit on operating income (loss)(282) (201) 73 57 — (353)Net operating (income) loss, after-tax, attributable to noncontrolling interests(45) (17) — — — (62)Net operating income (loss) from continuing operations attributable to CNA591 494 (16) (87) — 982Net realized investment gains (losses), net of participating policyholders’ interests(186) (360) (235) (76) — (857)Income tax (expense) benefit on net realized investment gains (losses)64 123 82 27 — 296Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests(1) 1 — — — —Net realized investment gains (losses) attributable to CNA(123) (236) (153) (49) — (561)Net income (loss) from continuing operations attributable to CNA$468 $258 $(169) $(136) $— $421(a) Related to business in property and casualty companies only.The 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 BusinessYears ended December 31     (In millions)2011 2010 2009CNA Specialty     International$210 $199 $171Professional & Management Liability2,541 2,551 2,339Surety472 475 474Warranty & Alternative Risks289 291 259CNA Specialty revenues3,512 3,516 3,243CNA Commercial     CNA Select Risk272 261 210Commercial Insurance2,681 2,851 2,692International537 499 617Small Business581 564 549CNA Commercial revenues4,071 4,175 4,068Life & Group Non-Core     Health1,093 1,100 811Life & Annuity229 249 211Other12 8 13Life & Group Non-Core revenues1,334 1,357 1,035Corporate & Other Non-Core revenues33 164 129Eliminations(3) (3) (3)Total revenues$8,947 $9,209 $8,472 |

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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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