CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment	[2],[3]	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[2],[3]	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance (shares) at Dec. 31, 2020					4,975,000	679,932,837
Beginning balance at Dec. 31, 2020		$ 60,204			$ 0	$ 7	$ 33,480	$ 40,088			$ 3,494	$ (16,865)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)		9,270						12,390			(3,120)
Dividends—common stock (shares)	[1]					28,410
Dividends—common stock	[1]	(1,148)				$ 0	4	(1,152)
Dividends—preferred stock		(274)						(274)
Purchases of treasury stock		(7,605)										(7,605)
Issuances of common stock and restricted stock, net of forfeitures (shares)						4,178,919
Issuances of common stock and restricted stock, net of forfeitures		253				$ 0	253
Exercises of stock options (shares)						917,778
Exercises of stock options		55				$ 0	55
Issuances of preferred stock (shares)					2,100,000
Issuances of preferred stock		2,052			$ 0		2,052
Redemptions of preferred stock (shares)					(2,100,000)
Redemptions of preferred stock		(2,100)			$ 0		(2,054)	(46)
Compensation expense for restricted stock units and stock options		322					322
Ending balance (shares) at Dec. 31, 2021					4,975,000	685,057,944
Ending balance at Dec. 31, 2021		61,029			$ 0	$ 7	34,112	51,006			374	(24,470)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)		(2,930)						7,360			(10,290)
Dividends—common stock (shares)	[1]					33,511
Dividends—common stock	[1]	(950)				$ 0	4	(954)
Dividends—preferred stock		(228)						(228)
Purchases of treasury stock		(4,948)										(4,948)
Issuances of common stock and restricted stock, net of forfeitures (shares)						4,909,173
Issuances of common stock and restricted stock, net of forfeitures		276				$ 0	276
Exercises of stock options (shares)						333,794
Exercises of stock options		19				$ 0	19
Compensation expense for restricted stock units and stock options		314					314
Ending balance (shares) at Dec. 31, 2022					4,975,000	690,334,422
Ending balance at Dec. 31, 2022		52,582	$ 37		$ 0	$ 7	34,725	57,184	$ 37		(9,916)	(29,418)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)		6,535						4,887			1,648
Dividends—common stock (shares)	[1]					39,420
Dividends—common stock	[1]	(931)				$ 0	4	(935)
Dividends—preferred stock		(228)						(228)
Purchases of treasury stock		(718)										(718)
Issuances of common stock and restricted stock, net of forfeitures (shares)						5,731,927
Issuances of common stock and restricted stock, net of forfeitures		299				$ 0	299
Exercises of stock options (shares)						136,899
Exercises of stock options		10				$ 0	10
Compensation expense for restricted stock units and stock options		503					503
Ending balance (shares) at Dec. 31, 2023					4,975,000	696,242,668
Ending balance at Dec. 31, 2023		$ 58,089			$ 0	$ 7	$ 35,541	$ 60,945			$ (8,268)	$ (30,136)

[1] We declared dividends per share on our common stock of $0.60 in each quarter of 2023 and 2022, and in the fourth quarter of 2021, $1.20 in the third quarter of 2021 and $0.40 in the first two quarters of 2021.

[2] Impact from the adoption of ASU 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures as of January 1, 2023.

[3] We have equity method investments in certain non-public entities which adopted ASU 2019-10, Financial Instruments - Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842) as of January 1, 2023. The impact to retained earnings was recorded in the second quarter of 2023, on a one quarter lag consistent with our standard operating procedures for equity method investments.