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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				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 9,726,176			$ 9,726,176
Current period change	$ 122,099		$ 566,888		(177,721)	$ 268,984
Balance	10,416,789		9,286,299		10,416,789	9,286,299
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	431,878	724,159	56,426	$ 304,425	724,159	304,425
Current period change	85,761		544,496		(206,520)	296,496
Balance	517,639	431,878	600,922	56,426	517,639	600,922
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(124,972)	(115,390)	(252,541)	(201,717)	(115,390)	(201,717)
Current period change	34,295		20,586		24,713	(30,238)
Balance	(90,677)	(124,972)	(231,955)	(252,541)	(90,677)	(231,955)
Benefit Plan Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(71,827)	(73,870)	(73,636)	(74,556)	(73,870)	(74,556)
Current period change	2,043		1,806		4,086	2,726
Balance	(69,784)	(71,827)	(71,830)	(73,636)	(69,784)	(71,830)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	235,079	534,899	(269,751)	28,152	534,899	28,152
Current period change	122,099	(299,820)	566,888	(297,903)
Balance	$ 357,178	$ 235,079	$ 297,137	$ (269,751)	$ 357,178	$ 297,137

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