Annual report pursuant to Section 13 and 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
Dec. 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 1,900 829
Notional amount of credit extension commitments under fair value option 4,000 4,400
Unfunded loan commitments    
Other Commitments [Line Items]    
Fair value carrying amount, liabilities $ 99 $ 90