Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands		Total	Series I Preferred Stock [Member]	Series H Preferred Stocks [Member]	Preferred Stock [Member]	Preferred Stock [Member] Series I Preferred Stock [Member]	Preferred Stock [Member] Series H Preferred Stocks [Member]	Common Stock [Member]	Common Stock Issuable [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Series I Preferred Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2020		$ 16,187,283			$ 1,250,000			$ 79,871	$ 1,344	$ 6,617,404		$ 13,444,428	$ (63,032)	$ (5,142,732)
Total comprehensive income		1,253,391										1,400,778	(147,387)
Preferred stock cash dividends	[1]	(51,150)										(51,150)
Issuance of preferred stock			$ 495,000			$ 500,000					$ (5,000)
Stock-based compensation transactions, net		71,774							(148)	12,252		(616)		60,286
Common stock cash dividends		(427,527)										(427,527)
Ending balance at Sep. 30, 2021		17,528,771			1,750,000			79,871	1,196	6,624,656		14,365,913	(210,419)	(5,082,446)
Beginning balance at Jun. 30, 2021		16,720,304			1,250,000			79,871	1,179	6,620,528		14,030,215	(176,974)	(5,084,515)
Total comprehensive income		462,015										495,460	(33,445)
Preferred stock cash dividends	[1]	(17,050)										(17,050)
Issuance of preferred stock			$ 495,000			$ 500,000					$ (5,000)
Stock-based compensation transactions, net		11,007							17	9,128		(207)		2,069
Common stock cash dividends		(142,505)										(142,505)
Ending balance at Sep. 30, 2021		17,528,771			1,750,000			79,871	1,196	6,624,656		14,365,913	(210,419)	(5,082,446)
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)

[1] For the three-month and nine-month periods ended September 30, 2022, 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 $0.7031, respectively; and Preferred Series I - $87.50 and $269.31, respectively. Dividends per preferred share for the three-month and nine-month periods ended September 30, 2021 were: Preferred Series E - $16.125 and $48.375, respectively; Preferred Series F - $128.125 and $384.375, respectively; and Preferred Series G - $125.00 and $375.00, respectively.