Consolidated Statement of Changes in Shareholders' Equity - USD ($) shares in Millions, $ in Millions		Total	Series J Preferred Stock	Preferred Stock	Preferred Stock Series J Preferred Stock	Common Stock	Common Stock Issuable	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net	Treasury Stock
Beginning balance at Dec. 31, 2022		$ 25,318		$ 2,011		$ 90	$ 1	$ 10,002	$ 15,754	$ (790)	$ (1,750)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		1,494							1,569
Preferred stock cash dividends	[1]	(50)							(50)
Stock-based compensation transactions, net		74						(2)	(1)		77
Common stock cash dividends		(435)							(435)
Purchases of treasury stock		(600)									(600)
Ending balance at Jun. 30, 2023		25,801		2,011		90	1	10,000	16,837	(865)	(2,273)
Beginning balance at Mar. 31, 2023		25,377		2,011		90	1	9,986	16,212	(645)	(2,278)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		647							867
Preferred stock cash dividends	[1]	(25)							(25)
Stock-based compensation transactions, net		19						14	0		5
Common stock cash dividends		(217)							(217)
Ending balance at Jun. 30, 2023		25,801		2,011		90	1	10,000	16,837	(865)	(2,273)
Beginning balance at Dec. 31, 2023		26,957		2,011		90	1	10,020	17,524	(459)	(2,230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		1,094							1,186
Preferred stock cash dividends	[1]	(52)							(52)
Issuance of Series J preferred stock (in shares)					733
Issuance of Series J preferred stock			$ 733
Stock-based compensation transactions, net		138						(44)	(1)		183
Common stock cash dividends		(446)							(446)
Ending balance at Jun. 30, 2024		28,424		2,744		90	1	9,976	18,211	(551)	(2,047)
Beginning balance at Mar. 31, 2024		27,169		2,011		90	1	9,976	17,812	(589)	(2,132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		693							655
Preferred stock cash dividends	[1]	(27)							(27)
Issuance of Series J preferred stock (in shares)					733
Issuance of Series J preferred stock			$ 733
Stock-based compensation transactions, net		84							(1)		85
Common stock cash dividends		(228)							(228)
Ending balance at Jun. 30, 2024		$ 28,424		$ 2,744		$ 90	$ 1	$ 9,976	$ 18,211	$ (551)	$ (2,047)

[1] For the three-month and six-month periods ended June 30, 2024, dividends per share for Preferred Series E were $22.95 and $39.075, respectively. For the three-month and six-month periods ended June 30, 2023 dividends per share for Preferred Series E were $16.125 and $32.25, respectively. For the three-month and six-month periods ended June 30, 2024 and 2023, dividends per preferred share were: Preferred Series F - $128.125 and $256.25, respectively; Preferred Series G - $125.00 and $250.00, respectively; Preferred Series H - $0.3516 and $0.7031, respectively; and Preferred Series I - $87.50 and $175.00, respectively.