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
Mar. 31, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
Legally binding unfunded commitments syndicated $ 10,900 $ 10,500
Carrying amount credit extension commitments syndicated 1,800 1,900
Notional amount of credit extension commitments under fair value option 4,600 4,000
Unfunded loan commitments    
Other Commitments [Line Items]    
Fair value carrying amount, liabilities $ 91 $ 99