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, 2021		$ 34,838	$ 4,105	$ 88,415	$ 272,268		$ (84)	$ (105,415)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance		0
Redemption		(2,000)
Shares issued and commitments to issue common stock for employee share-based compensation awards, and related tax effects				(155)
Net income	$ 8,282				8,282
Dividends declared:
Preferred stock					(397)
Common stock ($1.00 and $1.00 per share, respectively)					(2,976)
Other comprehensive income/(loss), after-tax	(9,483)						(9,483)
Repurchase								(2,500)
Reissuance								1,001
Ending balance at Mar. 31, 2022	285,899	32,838	4,105	88,260	277,177		(9,567)	(106,914)
Beginning balance at Dec. 31, 2022	292,332	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 ($1.00 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)