Noninterest Income - Summary of Noninterest Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Other Income and Expenses [Abstract]
Gains (losses) on investment securities, net	$ (127)	$ 189	$ (199)	$ 661
Gains on equity warrant assets, net	40	147	120	491
Client investment fees	119	20	237	55
Wealth management and trust fees	19	22	63	22
Foreign exchange fees	74	65	216	189
Credit card fees	37	34	114	93
Deposit service charges	32	29	94	82
Lending related fees	20	21	65	55
Letters of credit and standby letters of credit fees	15	13	43	39
Investment banking revenue	75	90	293	335
Commissions	24	17	73	58
Other	31	25	119	97
Total noninterest income	$ 359	$ 672	$ 1,238	$ 2,177