Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Basic earnings per share
Net income	$ 14,393	$ 12,898	$ 44,023	$ 44,466
Less: Preferred stock dividends	282	286	819	1,000
Net income applicable to common equity	14,111	12,612	43,204	43,466
Less: Dividends and undistributed earnings allocated to participating securities	68	75	213	267
Net income applicable to common stockholders	$ 14,043	$ 12,537	$ 42,991	$ 43,199
Total weighted-average basic shares outstanding (in shares)	2,762.4	2,860.6	2,790.2	2,886.2
Net income per share (in dollars per share)	$ 5.08	$ 4.38	$ 15.41	$ 14.97
Diluted earnings per share
Net income applicable to common stockholders	$ 14,043	$ 12,537	$ 42,991	$ 43,199
Total weighted-average basic shares outstanding (in shares)	2,762.4	2,860.6	2,790.2	2,886.2
Add: Dilutive impact of unvested PSUs, nondividend-earning RSUs and SARs (in shares)	5.2	5.3	5.0	5.0
Total weighted-average diluted shares outstanding (in shares)	2,767.6	2,865.9	2,795.2	2,891.2
Net income per share (in dollars per share)	$ 5.07	$ 4.37	$ 15.38	$ 14.94