Variable Interest Entities - Loans Sold to Third-Party Sponsored Securitization Entities (Details) - Nonconsolidated entities - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Summary of loan sale activities
Carrying value of loans sold	$ 7,132	$ 5,582	$ 18,298	$ 14,603
Proceeds received from loan sales as cash	385	119	751	159
Proceeds from loans sales as securities	6,695	5,397	17,386	14,279
Total proceeds received from loan sales	7,080	5,516	18,137	14,438
Gains/(losses) on loan sales	$ 0	$ 0	$ 0	$ 0