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Investments - Net Investment Income and Investment Gains (Losses) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Investment Income [Line Items]        
Total investment income $ 602 $ 525 $ 1,038 $ 1,127
Investment expenses (15) (15) (29) (29)
Investment gains (losses) 1 (2) (27) 8
Net investment income 587 510 1,009 1,098
Fixed Maturity Securities [Member]        
Net Investment Income [Line Items]        
Total investment income 449 452 895 895
Investment gains (losses) 4 (12) (13)  
Equity Securities [Member]        
Net Investment Income [Line Items]        
Total investment income 4 3 7 6
Investment gains (losses) 3 (1) (2) (1)
Derivative Instruments [Member]        
Net Investment Income [Line Items]        
Investment gains (losses) (6) 11 (13) 10
Short Term Investments [Member]        
Net Investment Income [Line Items]        
Total investment income 2   5 3
Investment gains (losses)     1 (1)
Limited Partnership Investments [Member]        
Net Investment Income [Line Items]        
Total investment income 47 50 7 210
Income (Loss) from Trading Portfolio [Member]        
Net Investment Income [Line Items]        
Total investment income 87 11 102 (4)
Other [Member]        
Net Investment Income [Line Items]        
Total investment income $ 13 $ 9 $ 22 $ 17