Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic earnings per share
Net income	$ 49,552	$ 37,676	$ 48,334
Less: Preferred stock dividends	1,501	1,595	1,600
Net income applicable to common equity	48,051	36,081	46,734
Less: Dividends and undistributed earnings allocated to participating securities	291	189	231
Net income applicable to common stockholders	$ 47,760	$ 35,892	$ 46,503
Total weighted-average basic shares outstanding (in shares)	2,938.6	2,965.8	3,021.5
Net income per share (in dollars per share)	$ 16.25	$ 12.10	$ 15.39
Diluted earnings per share
Net income applicable to common stockholders	$ 47,760	$ 35,892	$ 46,503
Total weighted-average basic shares outstanding (in shares)	2,938.6	2,965.8	3,021.5
Add: Dilutive impact of unvested PSUs, nondividend-earning RSUs and SARs (in shares)	4.5	4.2	5.1
Total weighted-average diluted shares outstanding (in shares)	2,943.1	2,970.0	3,026.6
Net income per share (in dollars per share)	$ 16.23	$ 12.09	$ 15.36