Consolidated Statement of Changes in Shareholders' Equity - USD ($)		Total	Series J Preferred Stock	Preferred Series E	Preferred Stock	Preferred Stock Series J Preferred Stock	Preferred Stock Preferred Series E	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		$ 25,318,000,000			$ 2,011,000,000			$ 90,000,000	$ 1,000,000	$ 10,002,000,000	$ 15,754,000,000	$ (790,000,000)	$ (1,750,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		2,107,000,000									2,259,000,000
Preferred stock cash dividends	[1]	(75,000,000)									(75,000,000)
Purchases of treasury stock		(600,000,000)											(600,000,000)
Stock-based compensation transactions, net		99,000,000								10,000,000	(1,000,000)		90,000,000
Common stock cash dividends		(653,000,000)									(653,000,000)
Ending balance at Sep. 30, 2023		26,196,000,000			2,011,000,000			90,000,000	1,000,000	10,012,000,000	17,284,000,000	(942,000,000)	(2,260,000,000)
Beginning balance at Jun. 30, 2023		25,801,000,000			2,011,000,000			90,000,000	1,000,000	10,000,000,000	16,837,000,000	(865,000,000)	(2,273,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		613,000,000									690,000,000
Preferred stock cash dividends	[1]	(25,000,000)									(25,000,000)
Stock-based compensation transactions, net		25,000,000								12,000,000			13,000,000
Common stock cash dividends		(218,000,000)									(218,000,000)
Ending balance at Sep. 30, 2023		26,196,000,000			2,011,000,000			90,000,000	1,000,000	10,012,000,000	17,284,000,000	(942,000,000)	(2,260,000,000)
Beginning balance at Dec. 31, 2023		26,957,000,000			2,011,000,000			90,000,000	1,000,000	10,020,000,000	17,524,000,000	(459,000,000)	(2,230,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		2,339,000,000									1,907,000,000	432,000,000
Redemption of Series E preferred stock				$ (350,000,000)			$ (350,000,000)
Preferred stock cash dividends	[1]	(99,000,000)									(99,000,000)
Issuance of Series J preferred stock			$ 733,000,000			$ 733,000,000
Purchases of treasury stock		(200,000,000)											(200,000,000)
Stock-based compensation transactions, net		167,000,000								(34,000,000)	(2,000,000)		203,000,000
Common stock cash dividends		(671,000,000)									(671,000,000)
Ending balance at Sep. 30, 2024		28,876,000,000			2,394,000,000			90,000,000	1,000,000	9,986,000,000	18,659,000,000	(27,000,000)	(2,227,000,000)
Beginning balance at Jun. 30, 2024		28,424,000,000			2,744,000,000			90,000,000	1,000,000	9,976,000,000	18,211,000,000	(551,000,000)	(2,047,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		1,245,000,000									721,000,000	524,000,000
Redemption of Series E preferred stock				$ (350,000,000)			$ (350,000,000)
Preferred stock cash dividends	[1]	(47,000,000)									(47,000,000)
Purchases of treasury stock		(200,000,000)											(200,000,000)
Stock-based compensation transactions, net		29,000,000								10,000,000	(1,000,000)		20,000,000
Common stock cash dividends		(225,000,000)									(225,000,000)
Ending balance at Sep. 30, 2024		$ 28,876,000,000			$ 2,394,000,000			$ 90,000,000	$ 1,000,000	$ 9,986,000,000	$ 18,659,000,000	$ (27,000,000)	$ (2,227,000,000)

[1] For the three-month and nine-month periods ended September 30, 2024, dividends per share for Preferred Series E were $23.50 and $62.575, respectively. For the three-month and nine-month periods ended September 30, 2023, dividends per share for Preferred Series E were $16.125 and $48.375, respectively. For the three-month and nine-month periods ended September 30, 2024 and 2023, dividends per preferred share were: Preferred Series F - $128.125 and $384.375, respectively; Preferred Series G - $125.00 and $375.00, respectively; Preferred Series H - $0.3516 and $1.0547, respectively; Preferred Series I - $87.50 and $262.50, respectively. For the three-month and nine-month periods ended September 30, 2024, dividends per share for Preferred Series J were $254.17.