Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic earnings per share
Net income	$ 8,649	$ 11,948	$ 16,931	$ 26,248
Less: Preferred stock dividends	410	393	807	772
Net income applicable to common equity	8,239	11,555	16,124	25,476
Less: Dividends and undistributed earnings allocated to participating securities	44	59	85	130
Net income applicable to common stockholders	$ 8,195	$ 11,496	$ 16,039	$ 25,346
Total weighted-average basic shares outstanding (in shares)	2,962.2	3,036.6	2,969.6	3,054.9
Net income per share (in dollars per share)	$ 2.77	$ 3.79	$ 5.40	$ 8.30
Diluted earnings per share
Net income applicable to common stockholders	$ 8,195	$ 11,496	$ 16,039	$ 25,346
Total weighted-average basic shares outstanding (in shares)	2,962.2	3,036.6	2,969.6	3,054.9
Add: Dilutive impact of SARs and employee stock options, unvested PSUs and nondividend-earning RSUs (in shares)	4.1	5.3	4.1	5.4
Total weighted-average diluted shares outstanding (in shares)	2,966.3	3,041.9	2,973.7	3,060.3
Net income per share (in dollars per share)	$ 2.76	$ 3.78	$ 5.39	$ 8.28