Variable Interest Entities - Loans Sold to Third-Party Sponsored Securitization Entities (Details) - Nonconsolidated entities - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Summary of loan sale activities
Carrying value of loans sold	$ 6,630	$ 6,323	$ 11,166	$ 9,021
Proceeds received from loan sales as cash	60	33	366	40
Proceeds from loans sales as securities	6,499	6,220	10,691	8,882
Total proceeds received from loan sales	6,559	6,253	11,057	8,922
Gains/(losses) on loan sales	$ 0	$ 0	$ 0	$ 0