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Securities - Realized gains and losses on investment securities Transactions Attributable to available-for-sale securities (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains $ 25 $ 13 $ 112 $ 86
Gross realized losses (9) (2) (31) (17)
Net realized gains $ 16 $ 11 $ 81 $ 69