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Claim and Claim Adjustment Expense Reserves (Gross and net carried claim and claim adjustment expense reserves) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Gross Case Reserves $ 12,668 $ 12,538    
Gross IBNR Reserves 12,095 11,765    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 24,763 24,303 25,496 26,816
Net Case Reserves 10,356 10,178    
Net IBNR Reserves 9,281 9,105    
Total Net Carried Claim and Claim Adjustment Expense Reserves 19,637 19,283 19,374 21,222
CNA Specialty [Member]
        
Gross Case Reserves 2,292 2,441    
Gross IBNR Reserves 4,456 4,399    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 6,748 6,840    
Net Case Reserves 2,008 2,086    
Net IBNR Reserves 4,104 3,937    
Total Net Carried Claim and Claim Adjustment Expense Reserves 6,112 6,023    
CNA Commercial [Member]
        
Gross Case Reserves 6,146 6,266    
Gross IBNR Reserves 5,180 5,243    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 11,326 11,509    
Net Case Reserves 5,611 5,720    
Net IBNR Reserves 4,600 4,670    
Total Net Carried Claim and Claim Adjustment Expense Reserves 10,211 10,390    
Hardy [Member]
        
Gross Case Reserves 333      
Gross IBNR Reserves 188      
Total Gross Carried Claim and Claim Adjustment Expense Reserves 521      
Net Case Reserves 192      
Net IBNR Reserves 82      
Total Net Carried Claim and Claim Adjustment Expense Reserves 274      
Life and Group Non-Core [Member]
        
Gross Case Reserves 2,690 2,510    
Gross IBNR Reserves 316 315    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 3,006 2,825    
Net Case Reserves 2,253 2,025    
Net IBNR Reserves 275 254    
Total Net Carried Claim and Claim Adjustment Expense Reserves 2,528 2,279    
Corporate and Other [Member]
        
Gross Case Reserves 1,207 1,321    
Gross IBNR Reserves 1,955 1,808    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 3,162 3,129    
Net Case Reserves 292 347    
Net IBNR Reserves 220 244    
Total Net Carried Claim and Claim Adjustment Expense Reserves $ 512 $ 591