Commitments and Contingencies - Credit Extension Commitments Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Legally binding unfunded commitments syndicated	$ 10,300	$ 10,400
Credit extension commitments, carrying value	1,200	1,600
Notional amount of credit extension commitments under fair value option	2,600	3,000
Unfunded loan commitments
Other Commitments [Line Items]
Fair value carrying amount, liabilities	$ 67	$ 110