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Long-Term Borrowings - Unsecured Long-Term Borrowings after Hedging (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Fixed rate obligations at fair value $ 146 $ 21
Fixed rate obligations at amortized cost 69,701 55,017
Floating rate obligations at fair value 30,120 22,252
Floating rate obligations at amortized cost 90,619 98,132
Total $ 190,586 $ 175,422