Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Basic earnings per share
Net income	$ 16,494	$ 14,643
Less: Preferred stock dividends	276	255
Net income applicable to common equity	16,218	14,388
Less: Dividends and undistributed earnings allocated to participating securities	70	71
Net income applicable to common stockholders	$ 16,148	$ 14,317
Total weighted-average basic shares outstanding (in shares)	2,716.2	2,819.4
Net income per share (in dollars per share)	$ 5.95	$ 5.08
Diluted earnings per share
Net income applicable to common stockholders	$ 16,148	$ 14,317
Total weighted-average basic shares outstanding (in shares)	2,716.2	2,819.4
Add: Dilutive impact of unvested PSUs, nondividend-earning RSUs and SARs (in shares)	4.0	4.9
Total weighted-average diluted shares outstanding (in shares)	2,720.2	2,824.3
Net income per share (in dollars per share)	$ 5.94	$ 5.07