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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
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 9,132,925
Current period change	(297,903)	$ 246,446
Balance	8,580,944	8,389,273
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	304,425	(179,392)
Current period change	(247,999)	231,417
Balance	56,426	51,851
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change		(174)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(201,717)	(215,747)
Current period change	(50,824)	14,052
Balance	(252,541)	(201,695)
Benefit Plan Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(74,556)	(67,418)
Current period change	920	1,151
Balance	(73,636)	(66,267)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	28,152	(462,557)
Current period change	(297,903)	246,446
Balance	$ (269,751)	$ (216,111)

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