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, 2023		$ 27,404	$ 4,105	$ 90,128	$ 332,901	$ (161)	$ (10,443)	$ (116,217)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance		2,496
Redemption		(8,250)
Shares issued and commitments to issue common stock for employee share-based compensation awards, and related tax effects				496
Other				14
Net income	$ 44,466				44,466
Preferred stock dividends					(1,000)
Common stock dividends ($1.50 and $1.25 per share and $4.30 and $3.55 per share, respectively)					(10,240)
Other comprehensive income, after-tax	3,659						3,659
Repurchase								(14,652)
Reissuance								1,130
Ending balance at Sep. 30, 2024	345,836	21,650	4,105	90,638	365,966		(6,784)	(129,739)
Beginning balance at Jun. 30, 2024		23,900	4,105	90,328	356,924		(11,338)	(123,367)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance		0
Redemption		(2,250)
Shares issued and commitments to issue common stock for employee share-based compensation awards, and related tax effects				307
Other				3
Net income	12,898				12,898
Preferred stock dividends					(286)
Common stock dividends ($1.50 and $1.25 per share and $4.30 and $3.55 per share, respectively)					(3,570)
Other comprehensive income, after-tax	4,554						4,554
Repurchase								(6,423)
Reissuance								51
Ending balance at Sep. 30, 2024	345,836	21,650	4,105	90,638	365,966		(6,784)	(129,739)
Beginning balance at Dec. 31, 2024	344,758	20,050	4,105	90,911	376,166		(12,456)	(134,018)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance		2,995
Redemption		(3,000)
Shares issued and commitments to issue common stock for employee share-based compensation awards, and related tax effects				(29)
Other				(17)
Net income	44,023				44,023
Preferred stock dividends					(819)
Common stock dividends ($1.50 and $1.25 per share and $4.30 and $3.55 per share, respectively)					(11,969)
Other comprehensive income, after-tax	6,578						6,578
Repurchase								(23,582)
Reissuance								1,274
Ending balance at Sep. 30, 2025	360,212	20,045	4,105	90,865	407,401		(5,878)	(156,326)
Beginning balance at Jun. 30, 2025		20,045	4,105	90,576	397,424		(7,243)	(147,983)
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				289
Other				0
Net income	14,393				14,393
Preferred stock dividends					(282)
Common stock dividends ($1.50 and $1.25 per share and $4.30 and $3.55 per share, respectively)					(4,134)
Other comprehensive income, after-tax	1,365						1,365
Repurchase								(8,397)
Reissuance								54
Ending balance at Sep. 30, 2025	$ 360,212	$ 20,045	$ 4,105	$ 90,865	$ 407,401		$ (5,878)	$ (156,326)