Noninterest Income - Summary of Noninterest Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Gains on investment securities, net	$ 761	$ 421	$ 135
Gains on equity warrant assets, net	560	237	138
Client investment fees	75	132	182
Wealth management and trust fees	44	0	0
Foreign exchange fees	262	179	159
Credit card fees	131	98	119
Deposit service charges	112	90	89
Lending related fees	76	57	50
Letters of credit and standby letters of credit fees	51	47	43
Investment banking revenue	459	414	195
Commissions	79	67	56
Other	128	98	55
Total noninterest income	$ 2,738	$ 1,840	$ 1,221