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Commitments and Contingencies - Credit Extension Commitments Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Legally binding unfunded commitments syndicated $ 10,700 $ 11,000
Carrying amount credit extension commitments syndicated 803 793
Deferred revenue 16 16
Other liabilities reserve for unfunded lending commitments 787 777
Notional amount of credit extension commitments under fair value option 3,400 4,800
Unfunded loan commitments    
Other Commitments [Line Items]    
Fair value carrying amount liabilities $ 114 $ 120