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Investments - Net Investment Income and Investment Gains (Losses) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net Investment Income [Line Items]      
Total investment income $ 2,194 $ 1,929 $ 2,221
Investment expenses (59) (63) (58)
Investment gains (losses) 50 (71) 54
Net investment income 2,135 1,866 2,163
Fixed Maturity Securities [Member]      
Net Investment Income [Line Items]      
Total investment income 1,819 1,751 1,803
Investment gains (losses) 54 (66) 41
Equity Securities [Member]      
Net Investment Income [Line Items]      
Total investment income 10 12 12
Investment gains (losses) (5) (23) 1
Derivative Instruments [Member]      
Net Investment Income [Line Items]      
Investment gains (losses) (2) 10 (1)
Short Term Investments [Member]      
Net Investment Income [Line Items]      
Total investment income 9 11 4
Investment gains (losses) 3 8 13
Limited Partnership Investments [Member]      
Net Investment Income [Line Items]      
Total investment income 199 119 304
Income from Trading Portfolio [Member]      
Net Investment Income [Line Items]      
Total investment income 112 2 64
Other [Member]      
Net Investment Income [Line Items]      
Total investment income $ 45 $ 34 $ 34