Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic earnings per share
Net income	$ 12,622	$ 8,282
Less: Preferred stock dividends	356	397
Net income applicable to common equity	12,266	7,885
Less: Dividends and undistributed earnings allocated to participating securities	73	40
Net income applicable to common stockholders	$ 12,193	$ 7,845
Total weighted-average basic shares outstanding (in shares)	2,968.5	2,977.0
Net income per share (in dollars per share)	$ 4.11	$ 2.64
Diluted earnings per share
Net income applicable to common stockholders	$ 12,193	$ 7,845
Total weighted-average basic shares outstanding (in shares)	2,968.5	2,977.0
Add: Dilutive impact of unvested PSUs, nondividend-earning RSUs and SARs (in shares)	4.2	4.0
Total weighted-average diluted shares outstanding (in shares)	2,972.7	2,981.0
Net income per share (in dollars per share)	$ 4.10	$ 2.63