Noninterest Revenue and Noninterest Expense - Commissions and Other Fees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Noninterest Income (Expense) [Abstract]
Brokerage commissions	$ 2,820	$ 2,831	$ 3,046
Administration fees	2,310	2,348	2,554
All other commissions and fees	1,706	1,402	1,024
Total commissions and other fees	$ 6,836	$ 6,581	$ 6,624