Commitments and Contingencies - Credit Extension Commitments Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Legally binding unfunded commitments syndicated	$ 11,000	$ 10,700
Credit extension commitments, carrying value	1,400	1,500
Notional amount of credit extension commitments under fair value option	4,000	4,800
Unfunded loan commitments
Other Commitments [Line Items]
Fair value carrying amount, liabilities	$ 136	$ 97