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		371,803					447,249	(75,446)
Preferred stock cash dividends	[1]	(17,050)					(17,050)
Stock-based compensation transactions, net		46,998			(179)	(6,254)	(208)		53,639
Common stock cash dividends		(142,526)					(142,526)
Ending 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)
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		112,367					362,174	(249,807)
Preferred stock cash dividends	[1]	(21,765)					(21,765)
Stock-based compensation transactions, net		37,869			(138)	(23,341)	(330)		61,678
Common stock cash dividends		(155,856)					(155,856)
Ending 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)

[1] For the three-months ended March 31, 2022, dividends per preferred share were: Preferred Series E - $16.125; Preferred Series F - $128.125; Preferred Series G - $125.00; and Preferred Series I - $94.306. Dividends per preferred share for the three-months ended March 31, 2021 were: Preferred Series E - $16.125; Preferred Series F - $128.125; Preferred Series G - $125.00.