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Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 9,726,176				$ 9,726,176
Current period change	$ (153,445)			$ 114,461			(331,166)	$ 383,446
Balance	9,978,635			9,591,292			9,978,635	9,591,292
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	517,639		724,159	600,922		$ 304,425	724,159	304,425
Current period change	(101,409)			52,027			(307,929)	348,524
Balance	416,230	$ 517,639		652,949	$ 600,922		416,230	652,949
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(90,677)		(115,390)	(231,955)		(201,717)	(115,390)	(201,717)
Current period change	(53,599)			60,628			(28,886)	30,390
Balance	(144,276)	(90,677)		(171,327)	(231,955)		(144,276)	(171,327)
Benefit Plan Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(69,784)		(73,870)	(71,830)		(74,556)	(73,870)	(74,556)
Current period change	1,563			1,806			5,649	4,532
Balance	(68,221)	(69,784)		(70,024)	(71,830)		(68,221)	(70,024)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	357,178	235,079	534,899	297,137	(269,751)	28,152	534,899	28,152
Current period change	(153,445)	122,099	(299,820)	114,461	566,888	(297,903)
Balance	$ 203,733	$ 357,178	$ 235,079	$ 411,598	$ 297,137	$ (269,751)	$ 203,733	$ 411,598

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