Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income		$ (1,118)	$ (79)	$ 650
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		1,092	833	133
Amortization of intangibles		136	126	5
Depreciation		48	39	18
Amortization of discounts and premiums, net		181	221	(37)
Net loss on securities		0	1	2
Net gain on MSR sale		(89)	0	0
Net gain on sales of loans		(48)	(89)	(5)
Net gain on sales of fixed assets		0	0	(2)
Long-term asset impairment		77	0	0
Loss (gain) on business acquisition		121	(2,131)	(159)
Goodwill Impairment		0	2,426	0
Stock-based compensation		54	47	29
Deferred tax expense		(411)	(187)	(3)
Changes in operating assets and liabilities:
Decrease (increase) in other assets		282	(721)	348
Decrease in other liabilities		(769)	(255)	(100)
Purchases of securities held for trading		0	(10)	(75)
Proceeds from sales of securities held for trading		0	10	75
Change in loans held for sale, net		530	32	147
Proceeds from sales of loans originated for sale			0	0
Net cash provided by operating activities		86	263	1,026
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from repayment of securities available for sale		2,099	1,402	732
Proceeds from sales of securities available for sale including loans that have been securitized		373	1,858	228
Purchase of securities available for sale		(3,440)	(3,046)	(2,242)
Redemption of Federal Home Loan Bank stock		436	1,501	635
Purchases of Federal Home Loan Bank and Federal Reserve Bank stock		(190)	(1,626)	(839)
Proceeds from bank-owned life insurance, net		21	30	16
Purchases of loans		0	0	(162)
Net proceeds from sales of MSR's		1,418	50	0
Other changes in loans, net		14,772	(4,331)	(5,019)
Purchases of premises and equipment, net		(36)	(66)	(3)
Cash acquired in business acquisition		0	24,901	331
Net cash provided by (used in) investing activities		15,453	20,673	(6,323)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) increase in deposits		(5,671)	(10,738)	7,662
Net (decrease) increase in short-term borrowed funds		(4,250)	(550)	2,550
Proceeds from long-term borrowed funds		28,236	19,850	9,479
Repayments of long-term borrowed funds		(30,837)	(19,374)	(13,960)
Net receipt (disbursement) of payments of loans serviced for others		27	(66)	(189)
Cash dividends paid on common stock		(53)	(486)	(317)
Cash dividends paid on preferred stock		(35)	(33)	(33)
Treasury stock repurchased		0	0	(7)
Proceeds from common stock issued, net		1,004	0	0
Proceeds from preferred stock issued, net		1	0	0
Payments relating to treasury shares received for restricted stock award tax payments		(11)	(12)	(17)
Net cash (used in) provided by financing activities		(11,589)	(11,409)	5,168
Net increase in cash, cash equivalents and restricted cash	[1]	3,950	9,527	(129)
Cash and cash equivalents at beginning of year	[1]	11,609	2,082	2,211
Cash and cash equivalents at end of year	[1]	15,559	11,609	2,082
Supplemental information:
Cash paid for interest		3,693	2,290	657
Cash paid for income taxes		33	54	17
Non-cash investing and financing activities:
Transfers to repossessed assets from loans		6	9	0
Securitization of loans to mortgage-backed securities available for sale		267	222	162
Transfer of loans from held for investment to held for sale		8,610	163	0
Non-cash reclassification of LHFS to securitized HFS loans		0	0	153
Transfer of loans from held for sale to held for investment		0	0	0
Mortgage servicing rights resulting from sale or securitization of loans		0	0	19
Business Combinations:
Fair value of tangible assets acquired		0	37,384	24,449
Intangible assets		0	464	292
Mortgage servicing rights		0	0	1,012
Liabilities assumed		0	35,632	23,584
Common Stock issued in business combination		0	0	2,010
Issuance of FDIC Equity appreciation instrument		0	85	0
Restricted stock units
Non-cash investing and financing activities:
Shares issued for restricted stock awards		$ 10	$ 31	$ 33

[1] For further information on restricted cash, see Note 2 - Summary of Significant Accounting Policies