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Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Operations and Comprehensive Income) (Details) (USD $)
In Millions, 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                      
Other revenues                 $ 320 $ 294 $ 292
Total revenues 2,434 2,466 2,246 2,401 2,261 2,175 2,198 2,315 9,547 8,949 9,209
Expenses                      
Interest                 170 175 157
Income tax expense (benefit)                 244 242 332
Net income (loss) attributable to CNA (9) 221 166 250 193 75 124 220 628 612 691
Total comprehensive income (loss) attributable to CNA                 979 755 1,340
Parent Company [Member]
                      
Revenues                      
Net investment income                 1 1 4
Net realized investment gains (losses)                 4 (9) (1)
Other revenues                 9 40 96
Total revenues                 14 32 99
Expenses                      
Administrative and general                 1 3 5
Interest                 164 167 148
Total expenses                 165 170 153
Income (loss) from operations before income taxes and equity in net income of subsidiaries                 (151) (138) (54)
Income tax expense (benefit)                 (144) (46) (19)
Income (loss) before equity in net income (loss) of subsidiaries                 (7) (92) (35)
Equity in net income of subsidiaries                 635 704 726
Net income (loss) attributable to CNA                 628 612 691
Equity in other comprehensive income of subsidiaries                 351 143 649
Total comprehensive income (loss) attributable to CNA                 $ 979 $ 755 $ 1,340