Noninterest Revenue and Noninterest Expense - Noninterest Expense (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Noninterest Income (Expense) [Abstract]
Legal expense			$ 361	$ 740	$ 1,436
FDIC-related expense			531	1,893	4,203
Operating losses			1,292	1,417	1,228
Contribution of Visa shares	$ 1,000		0	1,000	$ 0
FDIC special assessment accrual (release) increase		$ 2,900	$ (763)	$ 725