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Commitments and Contingencies - Credit Extension Commitments Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]    
Legally binding unfunded commitments syndicated $ 10,500 $ 10,600
Carrying amount credit extension commitments syndicated 1,400 829
Deferred revenue 18 16
Other liabilities reserve for unfunded lending commitments 1,360 813
Notional amount of credit extension commitments under fair value option 3,800 4,400
Unfunded loan commitments    
Other Commitments [Line Items]    
Fair value carrying amount, liabilities $ 207 $ 90