Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Credit Extension Commitments Narrative (Details)

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Commitments and Contingencies - Credit Extension Commitments Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Legally binding unfunded commitments syndicated $ 10,900 $ 10,700
Carrying amount credit extension commitments syndicated 826 813
Deferred revenue 17 16
Other liabilities reserve for unfunded lending commitments 809 797
Notional amount of credit extension commitments under fair value option 4,800 3,100
Unfunded loan commitments    
Other Commitments [Line Items]    
Fair value carrying amount, liabilities $ 116 $ 169