Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2021	$ 27,363	$ 1,976	$ 504	$ 10,787	$ 25,238	$ (1,133)	$ (10,009)
Beginning balance ( in shares) at Dec. 31, 2021			503,880,000
Treasury stock, beginning balance (in shares) at Dec. 31, 2021							137,897,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,774				2,774
Other comprehensive income (loss)	(2,578)					(2,578)
Common stock dividends	(871)				(871)
Preferred stock cash dividend	(112)				(112)
Common stock acquired (in shares)							19,524,000
Common stock acquired	(1,500)						$ (1,500)
Common stock awards exercised (in shares)							(2,565,000)
Common stock awards exercised	129			(43)			$ 172
Other (in shares)							(1,000)
Other	(14)			(14)	(1)		$ 1
Ending balance at Dec. 31, 2022	25,191	1,976	$ 504	10,730	27,028	(3,711)	$ (11,336)
Ending balance (in shares) at Dec. 31, 2022			503,880,000
Treasury stock, ending balance (in shares) at Dec. 31, 2022							154,855,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,944				1,944
Other comprehensive income (loss)	1,357					1,357
Common stock dividends	(837)				(837)
Preferred stock cash dividend	(122)				(122)
Common stock acquired (in shares)							49,212,000
Common stock acquired	(3,837)						$ (3,837)
Common stock awards exercised (in shares)							(2,133,000)
Common stock awards exercised	159			11			$ 148
Other (in shares)							2,000
Other	(56)				(56)
Ending balance at Dec. 31, 2023	$ 23,799	1,976	$ 504	10,741	27,957	(2,354)	$ (15,025)
Ending balance (in shares) at Dec. 31, 2023			503,880,000
Treasury stock, ending balance (in shares) at Dec. 31, 2023	201,935,599						201,936,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 2,687				2,687
Other comprehensive income (loss)	254					254
Common stock issued	2,323	2,323
Preferred stock redeemed	(1,500)	(1,483)			(17)
Common stock dividends	(859)				(859)
Preferred stock cash dividend	(185)				(185)
Common stock acquired (in shares)							15,135,000
Common stock acquired	(1,312)						$ (1,312)
Common stock awards exercised (in shares)							(1,950,000)
Common stock awards exercised	118			(21)			$ 139
Other (in shares)							(8,000)
Other	1			2	(1)
Ending balance at Dec. 31, 2024	$ 25,326	$ 2,816	$ 504	$ 10,722	$ 29,582	$ (2,100)	$ (16,198)
Ending balance (in shares) at Dec. 31, 2024			503,880,000
Treasury stock, ending balance (in shares) at Dec. 31, 2024	215,113,190						215,113,000