Commitments and Contingencies - Credit Extension Commitments Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Legally binding unfunded commitments syndicated	$ 10,700	$ 10,500
Credit extension commitments, carrying value	1,500	1,900
Notional amount of credit extension commitments under fair value option	4,800	4,000
Unfunded loan commitments
Other Commitments [Line Items]
Fair value carrying amount, liabilities	$ 97	$ 99