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Other Assets - Schedule of Other Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Other Assets [Line Items]    
Other $ 432 $ 400
Total 4,782 4,682
Other Assets [Member]    
Other Assets [Line Items]    
Accrued interest receivable, net 1,596 1,646
Derivatives at fair value 1,083 678
Income tax asset, net current and deferred 871 906
Benefit and insurance-related investments 483 491
Fixed assets, net 160 162
Accounts receivable 92 329
Other loans, net $ 65 $ 70