Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities:
Net income	$ 3,237	$ 3,257	$ 2,415
Adjustments to reconcile net income to net cash from operating activities:
Provision for credit losses	615	566	547
Depreciation	466	424	408
Loss (gain) on early extinguishment of debt	0	0	392
Amortization of intangibles	164	131	142
Equity-based compensation expense	165	141	132
(Gain) loss on securities, net	116	(3)	1
Net change in operating assets and liabilities:
LHFS	(1,895)	188	618
Pension asset	(1,815)	99	(266)
Increase (Decrease) in Other Noncurrent Assets	(368)	(242)	(115)
Other assets and other liabilities	67	(118)	251
Other, net	32	(578)	(120)
Net cash from operating activities	1,520	4,349	4,635
Cash Flows From Investing Activities:
Proceeds from sales of AFS securities	36,780	383	4,934
Proceeds from maturities, calls and paydowns of AFS securities	4,797	3,674	4,800
Purchases of AFS securities	(42,646)	(4,722)	(7,397)
Proceeds from maturities, calls and paydowns of HTM securities	2,499	2,442	2,580
Purchases of HTM securities	0	(39)	(8,965)
Originations and purchases of loans and leases, net of sales and principal collected	656	(6,266)	(1,230)
Net cash received (paid) for mergers, acquisitions and divestitures	6,256	(296)	0
Other, net	6	(139)	(132)
Net cash from investing activities	8,348	(4,963)	(5,410)
Cash Flows From Financing Activities:
Net change in deposits	2,917	3,838	(2,842)
Net change in short-term borrowings	6,293	240	3,532
Proceeds from issuance of long-term debt	7,084	2,769	8,883
Repayment of long-term debt	(9,265)	(2,533)	(7,453)
Repurchase of common stock	0	(1,205)	(1,613)
Net proceeds from preferred stock issued	1,683	0	0
Redemption of preferred stock	(1,725)	0	0
Cash dividends paid on common stock	(1,309)	(1,204)	(1,005)
Cash dividends paid on preferred stock	(150)	(174)	(174)
Other, net	(175)	(229)	123
Net cash from financing activities	5,353	1,502	(549)
Net Change in Cash and Cash Equivalents	15,221	888	(1,324)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	3,844	2,956	4,280
Cash, Cash Equivalents and Restricted Cash at End of Period	19,065	3,844	2,956
Supplemental Disclosure of Cash Flow Information:
Net cash paid (received) during the period for interest expense	1,921	1,408	819
Net cash paid (received) during the period for income taxes	443	99	429
Noncash investing activities:
Transfers of loans to foreclosed assets	255	247	260
Transfer of loans HFI to LHFS	7,434	77	1,050
Stock issued in business combinations	33,546	0	0
Debt Securities, Held-to-maturity, Transfer, Amount	$ 18,022	$ 0	$ 0