Noninterest Revenue and Noninterest Expense - Commissions and Other Fees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Noninterest Income (Expense) [Abstract]
Brokerage commissions and fees	$ 785	$ 692	$ 2,336	$ 2,161
Administration fees	660	589	1,874	1,721
All other commissions and fees	491	424	1,455	1,257
Total commissions and other fees	$ 1,936	$ 1,705	$ 5,665	$ 5,139