CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock
Beginning balance (shares) at Dec. 31, 2019				4,975,000	672,969,391
Beginning balance at Dec. 31, 2019		$ 58,011	$ (2,192)	$ 0	$ 7	$ 32,980	$ 40,340	$ (2,184)	$ 1,156	$ (8)	$ (16,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)		5,060					2,714		2,346
Dividends, common stock (shares)	[1]				32,466
Dividends, common stock	[1]	(460)			$ 0	3	(463)
Dividends, preferred stock		(280)					(280)
Purchases of treasury stock		(393)									(393)
Issuances of common stock and restricted stock, net of forfeitures (shares)					5,539,010
Issuances of common stock and restricted stock, net of forfeitures		241			$ 0	241
Exercises of stock options (shares)					1,391,970
Exercises of stock options		62			$ 0	62
Issuances of preferred stock (shares)				1,375,000
Issuances of preferred stock		1,330		$ 0		1,330
Redemptions of preferred stock		(1,375)		$ 0		(1,336)	(39)
Redemptions of preferred stock (shares)				(1,375,000)
Compensation expense for restricted stock units and stock options		200				200
Ending balance (shares) at Dec. 31, 2020				4,975,000	679,932,837
Ending 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		(2,100)		$ 0		(2,054)	(46)
Redemptions of preferred stock (shares)				(2,100,000)
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		$ 0	$ 7	$ 34,725	$ 57,184		$ (9,916)		$ (29,418)

[1] We declared dividends per share on our common stock of $0.60 in each quarter of 2022 and the fourth quarter of 2021, $1.20 in the third quarter of 2021, $0.40 in the first two quarters of both 2021 and 2020, and $0.10 in the last two quarters of 2020.