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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 16,493,187,000
Allowance for Credit Losses	(21,774,000)	$ 0
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,493,187,000	16,473,491,000
Allowance for Credit Losses	(21,774,000)
Unrealized Appreciation	515,329,000	472,622,000
Unrealized Depreciation	(440,847,000)	(121,169,000)
Market Value	16,545,895,000	16,824,944,000
OTTI in AOCI		987,000
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,346,812,000	1,489,660,000
Allowance for Credit Losses
Unrealized Appreciation	86,893,000	28,357,000
Unrealized Depreciation	(894,000)	(2,214,000)
Market Value	1,432,811,000	1,515,803,000
OTTI in AOCI
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	508,158,000	507,353,000
Allowance for Credit Losses
Unrealized Appreciation	21,737,000	29,651,000
Unrealized Depreciation	(4,993,000)	(89,000)
Market Value	524,902,000	536,915,000
OTTI in AOCI
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,422,137,000	6,227,661,000
Allowance for Credit Losses	(17,305,000)
Unrealized Appreciation	145,334,000	185,052,000
Unrealized Depreciation	(202,844,000)	(37,767,000)
Market Value	6,347,322,000	6,374,946,000
OTTI in AOCI		469,000
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	981,323,000	892,373,000
Allowance for Credit Losses
Unrealized Appreciation	1,987,000	6,818,000
Unrealized Depreciation	(79,157,000)	(1,858,000)
Market Value	904,153,000	897,333,000
OTTI in AOCI
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	816,098,000	814,570,000
Allowance for Credit Losses
Unrealized Appreciation	29,302,000	31,236,000
Unrealized Depreciation	(5,301,000)	(1,249,000)
Market Value	840,099,000	844,557,000
OTTI in AOCI
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,156,914,000	2,173,099,000
Allowance for Credit Losses
Unrealized Appreciation	67,111,000	36,361,000
Unrealized Depreciation	(2,854,000)	(10,879,000)
Market Value	2,221,171,000	2,198,581,000
OTTI in AOCI
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,153,000	5,723,000
Allowance for Credit Losses
Unrealized Appreciation
Unrealized Depreciation	(156,000)	(20,000)
Market Value	3,997,000	5,703,000
OTTI in AOCI
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,471,398,000	1,492,315,000
Allowance for Credit Losses	(519,000)
Unrealized Appreciation	57,335,000	47,148,000
Unrealized Depreciation	(50,496,000)	(33,513,000)
Market Value	1,477,718,000	1,505,950,000
OTTI in AOCI		71,000
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,786,194,000	2,870,737,000
Allowance for Credit Losses	(3,950,000)
Unrealized Appreciation	105,630,000	107,999,000
Unrealized Depreciation	(94,152,000)	(33,580,000)
Market Value	$ 2,793,722,000	2,945,156,000
OTTI in AOCI		$ 447,000

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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