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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues $ 2,434 $ 2,466 $ 2,246 $ 2,401 $ 2,261 $ 2,175 $ 2,198 $ 2,315 $ 9,547 $ 8,949 $ 9,209
Income (loss) from continuing operations (9) 221 166 250 194 76 129 230 628 629 780
Income (loss) from discontinued operations, net of income tax (expense) benefit                  (1)    (1) (21)
Net (income) loss attributable to noncontrolling interests         (1) (1) (5) (9)    (16) (68)
Net income (loss) attributable to CNA $ (9) $ 221 $ 166 $ 250 $ 193 $ 75 $ 124 $ 220 $ 628 $ 612 $ 691
Basic and Diluted Earnings (Loss) Per Share Attributable to CNA Common Stockholders                      
Income (loss) from continuing operations attributable to CNA common stockholders $ (0.03) $ 0.82 $ 0.62 $ 0.93 $ 0.71 $ 0.28 $ 0.46 $ 0.82 $ 2.33 $ 2.27 $ 2.36
Income (loss) from discontinued operations attributable to CNA common stockholders                           $ (0.08)
Basic and diluted earnings (loss) per share attributable to CNA common stockholders $ (0.03) $ 0.82 $ 0.62 $ 0.93 $ 0.71 $ 0.28 $ 0.46 $ 0.82 $ 2.33 $ 2.27 $ 2.28