CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance (shares) at Dec. 31, 2021				4,975,000	685,057,944
Beginning 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)		(2,064)					2,403		(4,467)
Dividends, common stock (shares)					18,408
Dividends, common stock		(251)			$ 0	2	(253)
Dividends, preferred stock		(57)					(57)
Purchases of treasury stock		(2,484)								(2,484)
Issuances of common stock and restricted stock, net of forfeitures (shares)					2,517,691
Issuances of common stock and restricted stock, net of forfeitures		68			$ 0	68
Exercises of stock options (shares)					7,809
Exercises of stock options		1			$ 0	1
Compensation expense for restricted stock units and stock options		103				103
Ending balance (shares) at Mar. 31, 2022				4,975,000	687,601,852
Ending balance at Mar. 31, 2022		56,345		$ 0	$ 7	34,286	53,099		(4,093)	(26,954)
Beginning balance (shares) at Dec. 31, 2022				4,975,000	690,334,422
Beginning balance at Dec. 31, 2022		52,582	$ 48	$ 0	$ 7	34,725	57,184	$ 48	(9,916)	(29,418)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)		2,336					960		1,376
Dividends, common stock (shares)	[1]				26,635
Dividends, common stock	[1]	(234)			$ 0	3	(237)
Dividends, preferred stock		(57)					(57)
Purchases of treasury stock		(246)								(246)
Issuances of common stock and restricted stock, net of forfeitures (shares)					2,972,149
Issuances of common stock and restricted stock, net of forfeitures		76			$ 0	76
Compensation expense for restricted stock units and stock options		148				148
Ending balance (shares) at Mar. 31, 2023				4,975,000	693,333,206
Ending balance at Mar. 31, 2023		$ 54,653		$ 0	$ 7	$ 34,952	$ 57,898		$ (8,540)	$ (29,664)

[1] We declared dividends per share on our common stock of $0.60 in both the first quarters of 2023 and 2022