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 [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		791,376					905,318	(113,942)
Preferred stock cash dividends	[1]	(34,100)					(34,100)
Stock-based compensation transactions, net		60,767			(165)	3,124	(409)		58,217
Common stock cash dividends		(285,022)					(285,022)
Ending 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)
Beginning balance at Mar. 31, 2021		16,446,508	1,250,000	79,871	1,165	6,611,150	13,731,893	(138,478)	(5,089,093)
Total comprehensive income		419,573					458,069	(38,496)
Preferred stock cash dividends	[1]	(17,050)					(17,050)
Stock-based compensation transactions, net		13,769			14	9,378	(201)		4,578
Common stock cash dividends		(142,496)					(142,496)
Ending 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)
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		200,784					579,696	(378,912)
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]	(46,706)					(46,706)
Purchases of treasury stock		(600,000)							(600,000)
Stock-based compensation transactions, net		55,281		23	(122)	(9,750)	(643)		65,773
Common stock cash dividends		(370,158)					(370,158)
Ending 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)
Beginning balance at Mar. 31, 2022		17,876,020	1,750,000	79,871	1,074	6,611,659	14,830,671	(377,385)	(5,019,870)
Total comprehensive income		88,417					217,522	(129,105)
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]	(24,941)					(24,941)
Purchases of treasury stock		(600,000)							(600,000)
Stock-based compensation transactions, net		17,412		23	16	13,591	(313)		4,095
Common stock cash dividends		(214,302)					(214,302)
Ending 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)

[1] For the three-month and six-month periods ended June 30, 2022, dividends per preferred share were: Preferred Series E - $16.125 and $32.25, respectively; Preferred Series F - $128.125 and $256.25, respectively; Preferred Series G - $125.00 and $250.00 respectively; and Preferred Series I - $87.50 and $181.81, respectively. Dividends per preferred share for the converted Preferred Series H were $0.3516 for the three-month period ended June 30, 2022. Dividends per preferred share for the three-month and six-month periods ended June 30, 2021 were: Preferred Series E - $16.125 and $32.25, respectively; Preferred Series F - $128.125 and $256.25, respectively; Preferred Series G - $125.00 and $250.00, respectively.