CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Millions		Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	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)		1,614				3,325	(1,711)
Dividends, common stock (shares)	[1]			13,356
Dividends, common stock	[1]	(184)		$ 0	1	(185)
Dividends, preferred stock		(61)				(61)
Purchases of treasury stock		(575)						(575)
Issuances of common stock and restricted stock, net of forfeitures (shares)				2,531,966
Issuances of common stock and restricted stock, net of forfeitures		60		$ 0	60
Exercises of stock options (shares)				283,398
Exercises of stock options		19		$ 0	19
Compensation expense for restricted stock units and stock options		111			111
Ending balance (shares) at Mar. 31, 2021			4,975,000	682,761,557
Ending balance at Mar. 31, 2021		61,188	$ 0	$ 7	33,671	43,167	1,783	(17,440)
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)	[1]			18,408
Dividends, common stock	[1]	(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)

[1] We declared dividends per share on our common stock of $0.60 in the first quarter of 2022 and $0.40 in the first quarter of 2021.