Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Basic earnings per share
Net income	$ 12,898	$ 13,151	$ 44,466	$ 40,245
Less: Preferred stock dividends	286	386	1,000	1,115
Net income applicable to common equity	12,612	12,765	43,466	39,130
Less: Dividends and undistributed earnings allocated to participating securities	75	80	267	241
Net income applicable to common stockholders	$ 12,537	$ 12,685	$ 43,199	$ 38,889
Total weighted-average basic shares outstanding (in shares)	2,860.6	2,927.5	2,886.2	2,946.6
Net income per share (in dollars per share)	$ 4.38	$ 4.33	$ 14.97	$ 13.20
Diluted earnings per share
Net income applicable to common stockholders	$ 12,537	$ 12,685	$ 43,199	$ 38,889
Total weighted-average basic shares outstanding (in shares)	2,860.6	2,927.5	2,886.2	2,946.6
Add: Dilutive impact of unvested PSUs, nondividend-earning RSUs and SARs (in shares)	5.3	4.6	5.0	4.4
Total weighted-average diluted shares outstanding (in shares)	2,865.9	2,932.1	2,891.2	2,951.0
Net income per share (in dollars per share)	$ 4.37	$ 4.33	$ 14.94	$ 13.18