CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net income		$ 2,073	$ 2,319	$ 1,057
Adjustments to reconcile net income to net change in cash due to operating activities:
Provision (benefit) for credit losses		474	(411)	1,616
Net change in loans held for sale		1,733	1,085	32
Depreciation, amortization and accretion		565	625	578
Deferred income taxes		57	(429)	(238)
Share-based compensation		84	59	48
Net gain on sale of assets		(9)	(11)	(4)
Net (increase) decrease in other assets		(1,894)	(1,719)	(3,979)
Net increase (decrease) in other liabilities		1,036	757	1,001
Net change due to operating activities		4,119	2,275	111
Investment securities:
Purchases of debt securities available for sale		(10,776)	(12,406)	(9,271)
Proceeds from maturities and paydowns of debt securities available for sale		3,422	7,810	6,943
Proceeds from sales of debt securities available for sale		1,178	790	585
Proceeds from maturities and paydowns of debt securities held to maturity		1,035	1,006	897
Net (increase) decrease in interest-bearing deposits in banks		13	(10)	(9)
Acquisitions, net of cash acquired	[1]	(255)	(165)	(3)
Purchases of loans		(1,007)	(3,778)	(3,315)
Sales of loans		2,677	934	3,014
Net (increase) decrease in loans and leases		(7,927)	(3,177)	(4,794)
Capital expenditures, net		(126)	(124)	(118)
Purchases of bank-owned life insurance		(100)	(1,050)	0
Other		(771)	(316)	(65)
Net change due to investing activities		(12,637)	(10,486)	(6,136)
FINANCING ACTIVITIES
Net increase (decrease) in deposits		6,146	7,197	21,851
Net increase (decrease) in short-term borrowed funds		(95)	(154)	(39)
Proceeds from issuance of long-term borrowed funds		24,617	0	8,323
Repayments of long-term borrowed funds		(19,691)	(1,352)	(14,022)
Treasury stock purchased		(153)	(295)	(270)
Net proceeds from issuance of preferred stock		0	296	395
Redemption of preferred stock		0	(250)	0
Dividends declared and paid to common stockholders		(779)	(670)	(672)
Dividends declared and paid to preferred stockholders		(113)	(113)	(98)
Premium paid to exchange debt		0	(1)	(80)
Payments of employee tax withholding for share-based compensation		(25)	(22)	(16)
Net change due to financing activities		9,907	4,636	15,372
Net change in cash and cash equivalents	[2]	1,389	(3,575)	9,347
Cash and cash equivalents at beginning of period	[2]	9,158	12,733	3,386
Cash and cash equivalents at end of period	[2]	10,547	9,158	12,733
Supplemental disclosures:
Interest paid		989	347	837
Income taxes paid		183	1,247	261
Non-cash items:
Transfer of securities from available for sale to held to maturity		8,563	0	813
Loans securitized and transferred to securities available for sale		143	260	956
Loans securitized and transferred to securities held to maturity		0	0	111
Stock issued for share-based compensation plans		77	43	30
Stock issued for Employee Stock Purchase Plan		24	22	19
Investors Acquisition:
Fair value of assets acquired, excluding cash and cash equivalents		27,113	0	0
Goodwill and other intangible assets		992	0	0
Fair value of liabilities assumed		24,982	0	0
Common stock issued		3,036	0	0
Replacement equity awards		$ 19	$ 0	$ 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, respectively, for the year ended December 31, 2022. See Note 2 for more detailed information regarding these acquisitions.

[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