Parent Company Only Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Income Statements, Captions [Line Items]
Interest income	$ 5,673	$ 3,289	$ 2,242
Interest expense	(1,188)	(110)	(85)
Gains on equity warrant assets, net	148	560	237
Gains (losses) on investment securities, net	(285)	761	421
Income tax expense	(563)	(651)	(448)
Preferred stock dividends	(163)	(63)	(17)
Net income available to common stockholders	1,509	1,770	1,191
Parent Company
Condensed Income Statements, Captions [Line Items]
Interest income	1	3	3
Interest expense	(91)	(48)	(22)
Dividend income from bank subsidiary	294	0	50
Gains on equity warrant assets, net	146	554	227
Gains (losses) on investment securities, net	(179)	197	158
Fund management fees and other noninterest income	54	68	62
General and administrative expenses	(284)	(298)	(121)
Income tax expense	143	(212)	(146)
Income before net income of subsidiaries	84	264	211
Net income before preferred stock dividend	1,672	1,833	1,208
Preferred stock dividends	(163)	(63)	(17)
Net income available to common stockholders	1,509	1,770	1,191
Parent Company | Bank Subsidiary
Condensed Income Statements, Captions [Line Items]
Income before net income of subsidiaries	2,035	1,294	826
Equity in undistributed net income of subsidiaries	1,741	1,294	776
Parent Company | Nonbank Subsidiaries
Condensed Income Statements, Captions [Line Items]
Income before net income of subsidiaries	(153)	275	221
Equity in undistributed net income of subsidiaries	$ (153)	$ 275	$ 221