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Other Assets - Schedule of Other Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Offsetting [Abstract]    
Accrued interest receivable, net $ 1,604 $ 1,663
Income tax asset, net current and deferred 673 725
Benefit and insurance-related investments 491 488
Derivatives at fair value 423 534
Other loans, net 166 148
Fixed assets, net 157 160
Accounts receivable 100 95
Other 378 380
Total $ 3,992 $ 4,193