Parent Company Only Condensed Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Adjustments to reconcile net income to net cash used for operating activities:
Gains on equity warrant assets, net	$ (148)	$ (560)	$ (237)
Gains (losses) on investment securities, net	285	(761)	(421)
Amortization of share-based compensation	183	136	84
Other, net	(483)	(296)	(310)
Net cash provided by operating activities	2,864	1,868	1,412
Cash flows from investing activities:
Net decrease in loans	(7,879)	(13,726)	(11,927)
Business acquisitions, net	0	1,081	(27)
Net cash used for investing activities	(3,638)	(90,336)	(31,206)
Cash flows from financing activities:
Proceeds from issuance of common stock, net	(22)	2,374	31
Net proceeds from the issuance of preferred stock	0	3,306	0
Payment of preferred stock dividends	(163)	(63)	(17)
Common stock repurchase	0	0	(60)
Net cash provided (used for) by financing activities	(9)	85,432	40,656
Net increase (decrease) in cash and cash equivalents	(783)	(3,036)	10,862
Cash and cash equivalents at beginning of period	14,586	17,622	6,760
Cash and cash equivalents at end of period	13,803	14,586	17,622
Parent Company
Condensed Cash Flow Statements, Captions [Line Items]
Net income before preferred stock dividend	1,672	1,833	1,208
Adjustments to reconcile net income to net cash used for operating activities:
Gains on equity warrant assets, net	(146)	(554)	(227)
Gains (losses) on investment securities, net	179	(197)	(158)
Gains on derivatives, net	0	0	(30)
Distributions of earnings from investment securities	33	60	65
Net income of subsidiaries	(84)	(264)	(211)
Cash dividends from bank subsidiary	294	0	50
Amortization of share-based compensation	183	136	84
(Increase) decrease in other assets	35	(40)	17
Increase (decrease) in other liabilities	(129)	58	99
Other, net	1	2	14
Net cash provided by operating activities	240	(271)	75
Cash flows from investing activities:
Net decrease in investment securities from purchases, sales and maturities	49	533	123
Net decrease in loans	0	0	15
Net cash used for investing activities	(916)	(5,329)	(654)
Cash flows from financing activities:
Proceeds from issuance long-term debt	795	1,636	495
Proceeds from issuance of common stock, net	(22)	2,374	31
Net proceeds from the issuance of preferred stock	0	3,306	0
Payment of preferred stock dividends		(63)	(17)
Common stock repurchase	0	0	(60)
Net cash provided (used for) by financing activities	610	7,253	449
Net increase (decrease) in cash and cash equivalents	(66)	1,653	(130)
Cash and cash equivalents at beginning of period	2,324	671	801
Cash and cash equivalents at end of period	2,258	2,324	671
Bank Subsidiary | Parent Company
Adjustments to reconcile net income to net cash used for operating activities:
Net income of subsidiaries	(2,035)	(1,294)	(826)
Cash flows from investing activities:
Increase (decrease) in investment in subsidiaries	(773)	(1,240)	(69)
Capital Infusion In Bank Subsidiary	0	(5,750)	(700)
Nonbank Subsidiaries | Parent Company
Adjustments to reconcile net income to net cash used for operating activities:
Net income of subsidiaries	153	(275)	(221)
Cash flows from investing activities:
Increase (decrease) in investment in subsidiaries	(192)	47	4
Business acquisitions, net	$ 0	$ 1,081	$ (27)