Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities:
Net income	$ 6,437	$ 4,492	$ 3,237
Adjustments to reconcile net income to net cash from operating activities:
Provision for credit losses	(813)	2,335	615
Depreciation	810	923	466
Amortization of intangibles	574	685	164
Securities (gains) losses	0	(402)	116
Net change in operating assets and liabilities:
LHFS	1,411	718	(1,895)
Loan servicing rights	(206)	607	97
Pension asset	(1,580)	(779)	(1,815)
Derivative assets and liabilities	1,296	(2,690)	(312)
Trading assets	(551)	1,861	368
Other assets and other liabilities	285	186	379
Other, net	229	(499)	100
Net cash from operating activities	7,892	7,437	1,520
Cash Flows From Investing Activities:
Proceeds from sales of AFS securities	148	5,276	36,780
Proceeds from maturities, calls and paydowns of AFS securities	33,968	24,627	4,797
Purchases of AFS securities	(70,775)	(72,808)	(42,646)
Proceeds from maturities, calls and paydowns of HTM securities	0	0	2,499
Originations and purchases of loans and leases, net of sales and principal collected	9,787	2,613	656
Net cash received (paid) for FHLB stock	116	600	147
Net cash received (paid) for securities borrowed or purchased under agreements to resell	(2,283)	(328)	(83)
Net cash paid for premises and equipment	(442)	(815)	(224)
Net cash received (paid) for mergers, acquisitions and divestitures	(1,638)	(2,439)	6,256
Payments for (Proceeds from) Life Insurance Policies	(606)	83	58
Other, net	(331)	(461)	108
Net cash from investing activities	(32,056)	(43,652)	8,348
Cash Flows From Financing Activities:
Net change in deposits	35,423	48,599	2,917
Net change in short-term borrowings	(800)	(12,124)	6,293
Proceeds from issuance of long-term debt	4,728	26,644	7,084
Repayment of long-term debt	(7,959)	(28,278)	(9,265)
Repurchase of common stock	(1,616)	0	0
Net proceeds from preferred stock issued	0	3,449	1,683
Redemption of preferred stock	(1,415)	(500)	(1,725)
Cash dividends paid on common stock	(2,485)	(2,424)	(1,309)
Cash dividends paid on preferred stock	(367)	(301)	(150)
Net cash received (paid) for hedge unwinds	0	1,101	(130)
Other, net	82	(148)	(45)
Net cash from financing activities	25,591	36,018	5,353
Net Change in Cash and Cash Equivalents	1,427	(197)	15,221
Cash and Cash Equivalents, January 1	18,868	19,065	3,844
Cash and Cash Equivalents, December 31	20,295	18,868	19,065
Supplemental Disclosure of Cash Flow Information:
Net cash paid (received) during the period for interest expense	859	1,834	1,921
Net cash paid (received) during the period for income taxes	792	126	443
Noncash investing activities:
Transfer of loans HFI to LHFS	925	2,562	7,434
Purchases (sales) of securities not yet settled	2,275	0	(1,442)
Stock issued in business combinations	0	0	33,546
Transfer of HTM securities to AFS	$ 0	$ 0	$ 18,022