Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net Income (Loss)	$ 2,741	$ 1,992	$ 1,859
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	645	517	(75)
Depreciation and amortization of premises and equipment	304	282	224
Amortization of capitalized servicing rights	131	97	90
Amortization of core deposit and other intangible assets	62	56	10
Provision for deferred income taxes	(97)	(30)	87
Asset write-downs	4	8	8
Net gain on sales of assets	(249)	(153)	(10)
Net change in accrued interest receivable, payable	261	(123)	66
Net change in other accrued income and expense	561	(70)	53
Net change in loans originated for sale	(192)	771	(164)
Net change in trading account and other non-hedging derivative assets and liabilities	(266)	1,227	567
Net cash provided by operating activities	3,905	4,574	2,715
Cash flows from investing activities
Proceeds from sales of investment securities equity and other	1,014	242	18
Proceeds from maturities of investment securities Available for sale	743	795	1,434
Proceeds from maturities of investment securities Held to maturity	1,170	1,516	615
Purchases of investment securities Available for sale	(346)	(7,222)	(678)
Purchases of investment securities Held to maturity	(2,948)	(1,890)	(1,602)
Purchases of investment securities equity and other	(1,205)	(456)	(30)
Net (increase) decrease in loans and leases	(2,770)	(3,639)	5,677
Net (increase) decrease in interest-bearing deposits at banks	(3,110)	26,107	(18,208)
Capital expenditures, net	(256)	(214)	(149)
Net (increase) decrease in loan servicing advances	274	1,579	(197)
Acquisition, net of cash consideration, Bank and bank holding company		394
Other, net	(440)	(620)	(511)
Net cash provided (used) by investing activities	(7,874)	16,592	(13,631)
Cash flows from financing activities
Net increase (decrease) in deposits	(248)	(20,994)	11,738
Net increase (decrease) in short-term borrowings	1,761	2,613	(13)
Proceeds from long-term borrowings	5,035	999	10
Payments on long-term borrowings	(824)	(907)	(853)
Purchases of treasury stock	(594)	(1,800)
Dividends paid — common	(868)	(784)	(580)
Dividends paid — preferred	(100)	(97)	(68)
Proceeds from issuance of Series I preferred stock			495
Other, net	18	(14)	(28)
Net cash provided (used) by financing activities	4,180	(20,984)	10,701
Net increase (decrease) in cash, cash equivalents and restricted cash	211	182	(215)
Cash, cash equivalents and restricted cash at beginning of period	1,520	1,338	1,553
Cash, cash equivalents and restricted cash at end of period	1,731	1,520	1,338
Supplemental disclosure of cash flow information
Interest received during the period	10,092	6,135	3,977
Interest paid during the period	2,691	429	139
Income taxes paid during the period	452	488	314
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	23	31	9
Additions to right-of-use assets under operating leases	$ 134	138	58
Loans held for sale transferred to loans held for investment			$ 330
Acquisition of bank and bank holding company, Common stock issued		8,286
Acquisition of bank and bank holding company, Common stock awards converted		105
Fair value of Assets acquired (noncash)		63,757
Fair value of Liabilities assumed		55,499
Fair value of Preferred stock converted		$ 261