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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				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period		$ 7,903,804,000			$ 7,903,804,000
Current period change	$ 171,209,000		$ (103,364,000)		417,655,000	$ (283,246,000)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01							$ 0		$ 1,201,000
Balance, end of period	8,884,160,000		8,241,349,000		8,884,160,000	8,241,349,000
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	51,851,000	(179,392,000)	(150,628,000)	$ 49,969,000	(179,392,000)	49,969,000
Current period change	197,312,000		(41,928,000)		428,729,000	(241,114,000)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01		0		0				$ 0	(1,201,000)
Balance, end of period	247,741,000	51,851,000	(192,155,000)	(150,628,000)	247,741,000	(192,155,000)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change	(1,422,000)		401,000		(1,596,000)	191,000
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(201,695,000)	(215,747,000)	(121,232,000)	(138,931,000)	(215,747,000)	(138,931,000)
Current period change	(25,832,000)		(63,652,000)		(11,780,000)	(45,953,000)
Balance, end of period	(227,527,000)	(201,695,000)	(184,884,000)	(121,232,000)	(227,527,000)	(184,884,000)
Benefit Plan Net Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(66,267,000)	(67,418,000)	(70,114,000)	(71,929,000)	(67,418,000)	(71,929,000)
Current period change	1,151,000		1,815,000		2,302,000	3,630,000
Balance, end of period	(65,116,000)	(66,267,000)	(68,299,000)	(70,114,000)	(65,116,000)	(68,299,000)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(216,111,000)		(341,974,000)	(160,891,000)		(160,891,000)
Current period change	171,209,000	246,446,000	(103,364,000)	(179,882,000)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01								$ 0	$ (1,201,000)
Balance, end of period	$ (44,902,000)	$ (216,111,000)	$ (445,338,000)	$ (341,974,000)	$ (44,902,000)	$ (445,338,000)

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

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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