Parent Company (Statement of Cash Flows) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Other		$ 831	$ (194)	$ 684
Net cash provided (used) by operating activities		9,083	7,214	4,659
Investing Activities
Securities available for sale		4,137	26,329	13,851
Net cash paid for acquisition	[1]		(10,511)
Other		(2,995)	(2,682)	(1,264)
Net cash provided (used) by investing activities		(13,428)	(2,795)	(51,122)
Financing Activities
Preferred stock issuances		2,225	1,484
Preferred stock redemptions		(1,500)		(480)
Acquisition of treasury stock		(3,731)	(1,079)	(1,624)
Preferred stock cash dividends paid		(301)	(233)	(229)
Common stock cash dividends paid		(2,391)	(2,056)	(1,980)
Net Increase (Decrease) In Cash And Due From Banks And Restricted Cash		(961)	987	1,956
Net Cash Provided By Discontinued Operations				11,542
Net Cash Provided (Used) By Continuing Operations		(961)	987	(9,586)
Cash and due from banks and restricted cash at beginning of period		8,004	7,017	5,061
Cash and due from banks and restricted cash at end of period		7,043	8,004	7,017
Parent Company
Operating Activities
Net income		6,041	5,673	7,517
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Equity in undistributed net earnings of subsidiaries		(2,303)	(1,628)
Return on investment in subsidiaries				6,444
Other		95	(248)	237
Net cash provided (used) by operating activities		3,833	3,797	14,198
Investing Activities
Securities available for sale			300
Net change in loans and securities from affiliates		(531)	(1,188)	(2,808)
Net change in nonrestricted interest-earning deposits				7,024
Net cash paid for acquisition			(11,358)
Other		(84)	(5)
Net cash provided (used) by investing activities		(615)	(12,251)	4,216
Financing Activities
Net change in other borrowed funds from affiliates		(1,138)	(435)	473
Proceeds from long-term borrowings		4,335	1,692	1,986
Repayments of long-term borrowings		(1,500)	(500)	(1,750)
Preferred stock issuances		2,225	1,484
Preferred stock redemptions		(1,500)		(480)
Common and treasury stock issuances		68	66	65
Acquisition of treasury stock		(3,731)	(1,079)	(1,624)
Preferred stock cash dividends paid		(301)	(233)	(229)
Common stock cash dividends paid		(2,389)	(2,056)	(1,979)
Net cash provided (used) by financing activities		(3,931)	(1,061)	(3,538)
Net Increase (Decrease) In Cash And Due From Banks And Restricted Cash		(713)	(9,515)	14,876
Net Cash Provided By Discontinued Operations				11,542
Net Cash Provided (Used) By Continuing Operations		(713)	(9,515)	3,334
Cash and due from banks and restricted cash at beginning of period		5,542	15,057	181
Cash and due from banks and restricted cash at end of period		$ 4,829	$ 5,542	$ 15,057

[1] During the year ended December 31, 2022, we transferred securities from available for sale to held to maturity in non-cash transactions. The amount of $88.6 billion includes the aggregate fair value of the securities of $82.7 billion and aggregate net pretax unrealized losses of $5.9 billion included in AOCI at transfer. See Note 3 Investment Securities for more detailed information on the transfers.