Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Preferred stock	Common stock	Additional paid-in capital	Retained earnings	Retained earnings Cumulative effect of change in accounting principles	Accumulated other comprehensive income/(loss)	Treasury stock, at cost
Beginning balance at Dec. 31, 2022		$ 27,404	$ 4,105	$ 89,044	$ 296,456	$ 449	$ (17,341)	$ (107,336)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance		0
Redemption		0
Shares issued and commitments to issue common stock for employee share-based compensation awards, and related tax effects				534
Other				0
Net income	$ 27,094				27,094
Preferred stock dividends					(729)
Common stock dividends ($1.15 and $1.00 per share and $2.30 and $2.00 per share, respectively)					(5,911)
Other comprehensive income/(loss), after-tax	3,051						3,051
Repurchase								(5,271)
Reissuance								967
Ending balance at Jun. 30, 2023	312,516	27,404	4,105	89,578	317,359		(14,290)	(111,640)
Beginning balance at Mar. 31, 2023		27,404	4,105	89,155	306,208		(14,418)	(109,372)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance		0
Redemption		0
Shares issued and commitments to issue common stock for employee share-based compensation awards, and related tax effects				423
Other				0
Net income	14,472				14,472
Preferred stock dividends					(373)
Common stock dividends ($1.15 and $1.00 per share and $2.30 and $2.00 per share, respectively)					(2,948)
Other comprehensive income/(loss), after-tax	128						128
Repurchase								(2,316)
Reissuance								48
Ending balance at Jun. 30, 2023	312,516	27,404	4,105	89,578	317,359		(14,290)	(111,640)
Beginning balance at Dec. 31, 2023	327,878	27,404	4,105	90,128	332,901	$ (161)	(10,443)	(116,217)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance		2,496
Redemption		(6,000)
Shares issued and commitments to issue common stock for employee share-based compensation awards, and related tax effects				189
Other				11
Net income	31,568				31,568
Preferred stock dividends					(714)
Common stock dividends ($1.15 and $1.00 per share and $2.30 and $2.00 per share, respectively)					(6,670)
Other comprehensive income/(loss), after-tax	(895)						(895)
Repurchase								(8,229)
Reissuance								1,079
Ending balance at Jun. 30, 2024	340,552	23,900	4,105	90,328	356,924		(11,338)	(123,367)
Beginning balance at Mar. 31, 2024		29,900	4,105	89,903	342,414		(11,639)	(118,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance		0
Redemption		(6,000)
Shares issued and commitments to issue common stock for employee share-based compensation awards, and related tax effects				414
Other				11
Net income	18,149				18,149
Preferred stock dividends					(317)
Common stock dividends ($1.15 and $1.00 per share and $2.30 and $2.00 per share, respectively)					(3,322)
Other comprehensive income/(loss), after-tax	301						301
Repurchase								(5,371)
Reissuance								50
Ending balance at Jun. 30, 2024	$ 340,552	$ 23,900	$ 4,105	$ 90,328	$ 356,924		$ (11,338)	$ (123,367)