Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands		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
Beginning balance at Dec. 31, 2021		$ 17,903,405	$ 1,750,000	$ 79,871	$ 1,212	$ 6,635,000	$ 14,646,448	$ (127,578)	$ (5,081,548)
Total comprehensive income		453,877					1,226,292	(772,415)
Common stock issued		8,286,515		9,824		3,256,821			5,019,870
Common stock awards converted		104,810				104,810
Conversion of Series H preferred stock		260,600	260,600
Preferred stock cash dividends	[1]	(71,647)					(71,647)
Purchases of treasury stock		(1,200,000)							(1,200,000)
Stock-based compensation transactions, net		99,228		23	(114)	(2,236)	(970)		102,525
Common stock cash dividends		(580,295)					(580,295)
Ending balance at Sep. 30, 2022		25,256,493	2,010,600	89,718	1,098	9,994,395	15,219,828	(899,993)	(1,159,153)
Beginning balance at Jun. 30, 2022		25,794,531	2,010,600	89,718	1,090	9,986,881	14,808,637	(506,490)	(595,905)
Total comprehensive income		253,093					646,596	(393,503)
Preferred stock cash dividends	[1]	(24,941)					(24,941)
Purchases of treasury stock		(600,000)							(600,000)
Stock-based compensation transactions, net		43,947			8	7,514	(327)		36,752
Common stock cash dividends		(210,137)					(210,137)
Ending balance at Sep. 30, 2022		25,256,493	2,010,600	89,718	1,098	9,994,395	15,219,828	(899,993)	(1,159,153)
Beginning balance at Dec. 31, 2022		25,317,990	2,010,600	89,718	1,112	10,002,891	15,753,978	(790,030)	(1,750,279)
Total comprehensive income		2,106,751					2,258,599	(151,848)
Preferred stock cash dividends	[1]	(74,822)					(74,822)
Purchases of treasury stock	[2]	(599,940)							(599,940)
Stock-based compensation transactions, net	[2]	98,513			(133)	9,547	(1,415)		90,514
Common stock cash dividends		(651,990)					(651,990)
Ending balance at Sep. 30, 2023		26,196,502	2,010,600	89,718	979	10,012,438	17,284,350	(941,878)	(2,259,705)
Beginning balance at Jun. 30, 2023		25,800,933	2,010,600	89,718	972	10,000,335	16,836,810	(864,800)	(2,272,702)
Total comprehensive income		612,863					689,941	(77,078)
Preferred stock cash dividends	[1]	(24,941)					(24,941)
Stock-based compensation transactions, net	[2]	24,638			7	12,103	(469)		12,997
Common stock cash dividends		(216,991)					(216,991)
Ending balance at Sep. 30, 2023		$ 26,196,502	$ 2,010,600	$ 89,718	$ 979	$ 10,012,438	$ 17,284,350	$ (941,878)	$ (2,259,705)

[1] For the three-month and nine-month periods ended September 30, 2023, dividends per preferred share were: Preferred Series E - $16.125 and $48.375, respectively; 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; and Preferred Series I - $87.50 and $262.50, respectively. Dividends per preferred share for the three-month and nine-month periods ended September 30, 2022 were: Preferred Series E - $16.125 and $48.375, respectively; Preferred Series F - $128.125 and $384.375, respectively; Preferred Series G - $125.00 and $375.00, respectively; Preferred Series H - $0.3516 and $0.7031, respectively; and Preferred Series I - $87.50. and $269.31, respectively.

[2] Effective January 1, 2023 amounts are inclusive of 1% U.S. government excise taxes receivable or payable.