CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net income		$ 1,608	$ 2,073	$ 2,319
Adjustments to reconcile net income to net change in cash due to operating activities:
Provision (benefit) for credit losses		687	474	(411)
Net change in loans held for sale, at fair value		98	1,733	1,085
Depreciation, amortization and accretion		478	565	625
Deferred income tax expense (benefit)		(242)	57	(429)
Share-based compensation		87	84	59
Net gain on sale of assets		(28)	(9)	(11)
Net (increase) decrease in other assets		612	(1,894)	(1,719)
Net increase (decrease) in other liabilities		(339)	1,036	757
Net change due to operating activities		2,961	4,119	2,275
Investment securities:
Purchases of debt securities available for sale		(10,087)	(10,776)	(12,406)
Proceeds from maturities and paydowns of debt securities available for sale		2,001	3,422	7,810
Proceeds from sales of debt securities available for sale		2,941	1,178	790
Proceeds from maturities and paydowns of debt securities held to maturity		761	1,035	1,006
Net (increase) decrease in interest-bearing deposits in banks		(102)	13	(10)
Acquisitions, net of cash acquired	[1]	0	(255)	(165)
Purchases of loans		0	(1,007)	(3,778)
Sales of loans		2,793	2,677	934
Net (increase) decrease in loans and leases		7,174	(7,927)	(3,177)
Capital expenditures, net		(172)	(126)	(124)
Purchases of bank-owned life insurance		0	(100)	(1,050)
Other		(61)	(771)	(316)
Net change due to investing activities		5,248	(12,637)	(10,486)
FINANCING ACTIVITIES
Net increase (decrease) in deposits		(3,382)	6,146	7,197
Net increase (decrease) in short-term borrowed funds		502	(95)	(154)
Proceeds from issuance of long-term borrowed funds		25,983	24,617	0
Repayments of long-term borrowed funds		(28,418)	(19,691)	(1,352)
Treasury stock purchased		(906)	(153)	(295)
Net proceeds from issuance of preferred stock		0	0	296
Redemption of preferred stock		0	0	(250)
Dividends paid to common stockholders		(808)	(779)	(670)
Dividends paid to preferred stockholders		(120)	(113)	(113)
Premium paid to exchange debt		0	0	(1)
Other		21	(25)	(22)
Net change due to financing activities		(7,128)	9,907	4,636
Net change in cash and cash equivalents	[2]	1,081	1,389	(3,575)
Cash and cash equivalents at beginning of period	[2]	10,547	9,158	12,733
Cash and cash equivalents at end of period	[2]	11,628	10,547	9,158
Supplemental disclosures:
Interest paid		3,640	989	347
Income taxes paid		375	183	1,247
Non-cash items:
Transfer of loans from portfolio to LHFS		2,617	0	0
Transfer of securities from AFS to HTM		0	8,563	0
Loans securitized and transferred to securities AFS		103	143	260
Investors Acquisition:
Fair value of assets acquired, excluding cash and cash equivalents		0	27,113	0
Goodwill and other intangible assets		0	992	0
Fair value of liabilities assumed		0	24,982	0
Common stock issued		0	3,036	0
Replacement equity awards		$ 0	$ 19	$ 0

[1] Primarily includes cash paid of $355 million to acquire Investors less $287 million in cash acquired, and $143 million and $23 million of cash paid for the HSBC transaction and acquisition of DH Capital, LLC, respectively, for the year ended December 31, 2022.

[2] Cash and cash equivalents include cash and due from banks and interest-bearing cash and due from banks as reflected on the Consolidated Balance Sheets