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				111
Net income	$ 12,622				12,622
Dividends declared:
Preferred stock					(356)
Common stock ($1.15 and $1.00 per share, respectively)					(2,963)
Other comprehensive income/(loss), after-tax	2,923						2,923
Repurchase								(2,955)
Reissuance								919
Ending balance at Mar. 31, 2023	303,082	27,404	4,105	89,155	306,208		(14,418)	(109,372)
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		0
Shares issued and commitments to issue common stock for employee share-based compensation awards, and related tax effects				(225)
Net income	13,419				13,419
Dividends declared:
Preferred stock					(397)
Common stock ($1.15 and $1.00 per share, respectively)					(3,348)
Other comprehensive income/(loss), after-tax	(1,196)						(1,196)
Repurchase								(2,858)
Reissuance								1,029
Ending balance at Mar. 31, 2024	$ 336,637	$ 29,900	$ 4,105	$ 89,903	$ 342,414		$ (11,639)	$ (118,046)