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Business Segments (Income Statement Information) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net written premiums $ 6,964 [1] $ 6,798 [1] $ 6,471 [1]
Operating Revenues      
Net earned premiums 6,882 6,603 6,515
Net investment income 2,282 2,054 2,316
Other revenues 320 294 292
Total operating revenues 9,484 8,951 9,123
Claims, Benefits and Expenses      
Net incurred claims and benefits 5,867 5,476 4,955
Policyholders' dividends 29 13 30
Amortization of deferred acquisition costs 1,274 1,176 1,168
Other insurance related expenses 1,049 980 1,016
Other expenses 456 433 928
Total claims, benefits and expenses 8,675 8,078 8,097
Operating income (loss) from continuing operations before income tax 809 873 1,026
Income tax (expense) benefit on operating income (loss) (222) (247) (296)
Net operating (income) loss, after-tax, attributable to noncontrolling interests   (16) (69)
Net operating income (loss) from continuing operations attributable to CNA 587 610 661
Net realized investment gains (losses), net of participating policyholders’ interests 63 (2) 86
Income tax (expense) benefit on net realized investment gains (losses) (22) 5 (36)
Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests     1
Net realized investment gains (losses) attributable to CNA 41 3 51
Net income (loss) from continuing operations attributable to CNA 628 613 712
CNA Specialty [Member]
      
Net written premiums 2,924 2,872 2,691
Operating Revenues      
Net earned premiums 2,898 2,796 2,679
Net investment income 592 500 591
Other revenues 230 221 216
Total operating revenues 3,720 3,517 3,486
Claims, Benefits and Expenses      
Net incurred claims and benefits 1,831 1,657 1,447
Policyholders' dividends 2 (3) 12
Amortization of deferred acquisition costs 614 568 545
Other insurance related expenses 301 294 276
Other expenses 206 191 190
Total claims, benefits and expenses 2,954 2,707 2,470
Operating income (loss) from continuing operations before income tax 766 810 1,016
Income tax (expense) benefit on operating income (loss) (262) (281) (341)
Net operating (income) loss, after-tax, attributable to noncontrolling interests   (12) (52)
Net operating income (loss) from continuing operations attributable to CNA 504 517 623
Net realized investment gains (losses), net of participating policyholders’ interests 22 (5) 30
Income tax (expense) benefit on net realized investment gains (losses) (9) 2 (10)
Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests       
Net realized investment gains (losses) attributable to CNA 13 (3) 20
Net income (loss) from continuing operations attributable to CNA 517 514 643
CNA Commercial [Member]
      
Net written premiums 3,373 3,350 3,208
Operating Revenues      
Net earned premiums 3,306 3,240 3,256
Net investment income 854 763 873
Other revenues 40 54 61
Total operating revenues 4,200 4,057 4,190
Claims, Benefits and Expenses      
Net incurred claims and benefits 2,574 2,296 2,175
Policyholders' dividends 11 8 14
Amortization of deferred acquisition costs 588 585 600
Other insurance related expenses 578 540 553
Other expenses 36 53 55
Total claims, benefits and expenses 3,787 3,482 3,397
Operating income (loss) from continuing operations before income tax 413 575 793
Income tax (expense) benefit on operating income (loss) (136) (204) (262)
Net operating (income) loss, after-tax, attributable to noncontrolling interests   (4) (17)
Net operating income (loss) from continuing operations attributable to CNA 277 367 514
Net realized investment gains (losses), net of participating policyholders’ interests 38 16 (15)
Income tax (expense) benefit on net realized investment gains (losses) (11) (2) (1)
Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests     1
Net realized investment gains (losses) attributable to CNA 27 14 (15)
Net income (loss) from continuing operations attributable to CNA 304 381 499
Hardy [Member]
      
Net written premiums 117    
Operating Revenues      
Net earned premiums 120    
Net investment income 3    
Other revenues 1    
Total operating revenues 124    
Claims, Benefits and Expenses      
Net incurred claims and benefits 72    
Policyholders' dividends       
Amortization of deferred acquisition costs 44    
Other insurance related expenses 25    
Other expenses 9    
Total claims, benefits and expenses 150    
Operating income (loss) from continuing operations before income tax (26)    
Income tax (expense) benefit on operating income (loss) 3    
Net operating income (loss) from continuing operations attributable to CNA (23)    
Net realized investment gains (losses), net of participating policyholders’ interests (1)    
Income tax (expense) benefit on net realized investment gains (losses)       
Net realized investment gains (losses) attributable to CNA (1)    
Net income (loss) from continuing operations attributable to CNA (24)    
Life and Group Non-Core [Member]
      
Net written premiums 553 577 573
Operating Revenues      
Net earned premiums 560 569 582
Net investment income 801 759 715
Other revenues 34 13 7
Total operating revenues 1,395 1,341 1,304
Claims, Benefits and Expenses      
Net incurred claims and benefits 1,406 1,526 1,275
Policyholders' dividends 16 8 4
Amortization of deferred acquisition costs 28 23 23
Other insurance related expenses 144 143 180
Other expenses 23 19 2
Total claims, benefits and expenses 1,617 1,719 1,484
Operating income (loss) from continuing operations before income tax (222) (378) (180)
Income tax (expense) benefit on operating income (loss) 132 170 91
Net operating (income) loss, after-tax, attributable to noncontrolling interests        
Net operating income (loss) from continuing operations attributable to CNA (90) (208) (89)
Net realized investment gains (losses), net of participating policyholders’ interests    (7) 53
Income tax (expense) benefit on net realized investment gains (losses)    2 (20)
Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests       
Net realized investment gains (losses) attributable to CNA    (5) 33
Net income (loss) from continuing operations attributable to CNA (90) (213) (56)
Corporate and Other Non-Core [Member]
      
Net written premiums (1) 2 2
Operating Revenues      
Net earned premiums    1 1
Net investment income 32 32 137
Other revenues 16 6 8
Total operating revenues 48 39 146
Claims, Benefits and Expenses      
Net incurred claims and benefits (16) (3) 58
Policyholders' dividends         
Amortization of deferred acquisition costs         
Other insurance related expenses 3 6 10
Other expenses 183 170 681
Total claims, benefits and expenses 170 173 749
Operating income (loss) from continuing operations before income tax (122) (134) (603)
Income tax (expense) benefit on operating income (loss) 41 68 216
Net operating (income) loss, after-tax, attributable to noncontrolling interests        
Net operating income (loss) from continuing operations attributable to CNA (81) (66) (387)
Net realized investment gains (losses), net of participating policyholders’ interests 4 (6) 18
Income 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 CNA 2 (3) 13
Net income (loss) from continuing operations attributable to CNA (79) (69) (374)
Eliminations [Member]
      
Net written premiums (2) (3) (3)
Operating Revenues      
Net earned premiums (2) (3) (3)
Net investment income         
Other revenues (1)      
Total operating revenues (3) (3) (3)
Claims, Benefits and Expenses      
Net incurred claims and benefits         
Policyholders' dividends         
Amortization of deferred acquisition costs         
Other insurance related expenses (2) (3) (3)
Other expenses (1)      
Total claims, benefits and expenses (3) (3) (3)
Operating income (loss) from continuing operations before income tax         
Income tax (expense) benefit on operating income (loss)         
Net operating (income) loss, after-tax, attributable to noncontrolling interests        
Net operating income (loss) from continuing operations attributable to CNA         
Net realized investment gains (losses), net of participating policyholders’ interests         
Income tax (expense) benefit on net realized investment gains (losses)         
Net realized investment (gains) losses, after-tax, attributable to noncontrolling interests       
Net realized investment gains (losses) attributable to CNA         
Net income (loss) from continuing operations attributable to CNA         
[1] (a)Related to business in property and casualty companies only.(b)Included from date of acquisition.