Parent Company (Statement of Cash Flows) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Other		$ 1,596	$ 1,195	$ 831
Net cash provided (used) by operating activities		7,880	10,111	9,083
Investing Activities
Other investing activities, net		(1,103)	(1,985)	(2,995)
Net cash provided (used) by investing activities		(3,232)	10,105	(60,358)
Financing Activities
Preferred stock issuances			1,484	2,225
Preferred stock redemptions		(500)	(1,000)	(1,500)
Acquisition of treasury stock		(687)	(651)	(3,731)
Preferred stock cash dividends paid		(352)	(417)	(301)
Common stock cash dividends paid		(2,537)	(2,461)	(2,391)
Net cash provided (used) by financing activities		(9,122)	(3,854)	3,384
Net Increase (Decrease) In Cash, Cash Equivalents And Restricted Cash	[1]	(4,474)	16,362	(47,891)
Cash, cash equivalents and restricted cash at beginning of period		50,725	34,363	82,254
Cash, cash equivalents and restricted cash at end of period		46,251	50,725	34,363
Parent Company
Operating Activities
Net income		5,889	5,578	6,041
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Equity in undistributed net earnings of subsidiaries		(2,224)	(3,176)	(2,303)
Other		443	1,276	95
Net cash provided (used) by operating activities		4,108	3,678	3,833
Investing Activities
Net change in loans and securities from affiliates		(5,192)	(9,475)	(531)
Other investing activities, net		1	(5)	(84)
Net cash provided (used) by investing activities		(5,191)	(9,480)	(615)
Financing Activities
Net change in other borrowed funds from affiliates		(465)	255	(1,138)
Proceeds from long-term borrowings		8,220	10,463	4,335
Repayments of long-term borrowings		(3,450)		(1,500)
Preferred stock issuances			1,484	2,225
Preferred stock redemptions		(500)	(1,000)	(1,500)
Common and treasury stock issuances		69	72	68
Acquisition of treasury stock		(687)	(651)	(3,731)
Preferred stock cash dividends paid		(352)	(417)	(301)
Common stock cash dividends paid		(2,534)	(2,459)	(2,389)
Net cash provided (used) by financing activities		301	7,747	(3,931)
Net Increase (Decrease) In Cash, Cash Equivalents And Restricted Cash		(782)	1,945	(713)
Cash, cash equivalents and restricted cash at beginning of period		6,774	4,829	5,542
Cash, cash equivalents and restricted cash at end of period		$ 5,992	$ 6,774	$ 4,829

[1] In the second quarter of 2024, we updated our policy for cash and cash equivalents to include interest-earning deposits with banks. See Note 1 Accounting Policies for additional information regarding this change to our cash and cash equivalents policy.