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Commitments and Contingencies - Credit Extension Commitments Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Other Commitments [Line Items]    
Legally binding unfunded commitments syndicated $ 13,900 $ 14,300
Carrying amount credit extension commitments syndicated 767 664
Deferred revenue 17 18
Other liabilities reserve for unfunded lending commitments 750 646
Notional amount of credit extension commitments under fair value option 8,100 10,900
Unfunded loan commitments    
Other Commitments [Line Items]    
Fair value carrying amount liabilities $ 347 $ 658