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Investments - Net Investment Income and Investment Gains (Losses) (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Investment Income [Line Items]        
Net unrealized gains (losses) on trading securities $ 8 $ (59) $ 63 $ (71)
Fixed Maturity Securities [Member]        
Net Investment Income [Line Items]        
Gross realized gains on available-for-sale securities 68 23 157 93
Gross realized losses on available-for-sale securities $ 24 $ 70 $ 128 $ 141