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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 ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 8,836,817,000	$ 8,389,273,000	$ 7,860,797,000	$ 8,208,613,000	$ 8,320,552,000	$ 8,340,736,000	$ 7,860,797,000	$ 8,340,736,000
Current period change	91,173,000			(24,979,000)			508,828,000	(308,225,000)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01									$ 0		$ 1,201,000
Balance	8,983,258,000	8,836,817,000	8,389,273,000	8,289,045,000	8,208,613,000	8,320,552,000	8,983,258,000	8,289,045,000
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	247,741,000		(179,392,000)	(192,155,000)		49,969,000	(179,392,000)	49,969,000
Current period change	93,190,000			(20,868,000)			521,919,000	(261,982,000)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01											(1,201,000)
Balance	340,978,000	247,741,000		(213,020,000)	(192,155,000)		340,978,000	(213,020,000)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change	47,000			3,000			(1,549,000)	194,000
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(227,527,000)		(215,747,000)	(184,884,000)		(138,931,000)	(215,747,000)	(138,931,000)
Current period change	(3,426,000)			(5,930,000)			(15,206,000)	(51,883,000)
Balance	(230,953,000)	(227,527,000)		(190,814,000)	(184,884,000)		(230,953,000)	(190,814,000)
Benefit Plan Net Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(65,116,000)		(67,418,000)	(68,299,000)		(71,929,000)	(67,418,000)	(71,929,000)
Current period change	1,363,000			1,816,000			3,665,000	5,446,000
Balance	(63,753,000)	(65,116,000)		(66,483,000)	(68,299,000)		(63,753,000)	(66,483,000)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(44,902,000)	(216,111,000)	(462,557,000)	(445,338,000)	(341,974,000)	(160,891,000)	(462,557,000)	(160,891,000)
Current period change	91,174,000	171,209,000	246,446,000	(24,979,000)	(103,364,000)	(179,882,000)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01											$ (1,201,000)
Balance	$ 46,272,000	$ (44,902,000)	$ (216,111,000)	$ (470,317,000)	$ (445,338,000)	$ (341,974,000)	$ 46,272,000	$ (470,317,000)

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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