Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Millions		Total	Preferred Stock [Member]	Common Stock [Member]	Common Stock Issuable [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2022		$ 25,318	$ 2,011	$ 90	$ 1	$ 10,002	$ 15,754	$ (790)	$ (1,750)
Total comprehensive income		847					702	145
Preferred stock cash dividends	[1]	(25)					(25)
Purchases of treasury stock		(600)							(600)
Stock-based compensation transactions, net		55				(16)	(1)		72
Common stock cash dividends		(218)					(218)
Ending balance at Mar. 31, 2023		25,377	2,011	90	1	9,986	16,212	(645)	(2,278)
Beginning balance at Dec. 31, 2023		26,957	2,011	90	1	10,020	17,524	(459)	(2,230)
Total comprehensive income		401					531	(130)
Preferred stock cash dividends	[1]	(25)					(25)
Stock-based compensation transactions, net		54				(44)			98
Common stock cash dividends		(218)					(218)
Ending balance at Mar. 31, 2024		$ 27,169	$ 2,011	$ 90	$ 1	$ 9,976	$ 17,812	$ (589)	$ (2,132)

[1] For the three-month periods ended March 31, 2024 and 2023, dividends per preferred share were: Preferred Series E - $16.125; Preferred Series F - $128.125; Preferred Series G - $125.00; Preferred Series H - $0.3516; and Preferred Series I - $87.50.