Noninterest Income - Summary of Noninterest Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Income and Expenses [Abstract]
Gains/(loss) on investment securities, net	$ (157)	$ 305	$ (72)	$ 472
Gains on equity warrant assets, net	17	122	80	344
Client investment fees	83	15	118	35
Wealth management and trust fees	22	0	44	0
Foreign exchange fees	69	67	142	124
Credit card fees	40	31	77	59
Deposit service charges	32	28	62	53
Lending related fees	26	18	45	34
Letters of credit and standby letters of credit fees	14	13	28	26
Investment banking revenue	125	103	218	245
Commissions	24	17	49	41
Other	67	42	88	72
Total noninterest income	$ 362	$ 761	$ 879	$ 1,505