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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	$ (1,745)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,225,067	16,473,491
Allowance for credit losses	(1,745)
Unrealized Appreciation	941,663	472,622
Unrealized Depreciation	(124,812)	(121,169)
Market Value	20,040,173	16,824,944
OTTI in AOCI		987
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,325,156	1,489,660
Allowance for credit losses
Unrealized Appreciation	49,084	28,357
Unrealized Depreciation	(7,134)	(2,214)
Market Value	1,367,106	1,515,803
OTTI in AOCI
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	543,895	507,353
Allowance for credit losses
Unrealized Appreciation	34,654	29,651
Unrealized Depreciation	(1,254)	(89)
Market Value	577,295	536,915
OTTI in AOCI
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,824,800	6,227,661
Allowance for credit losses	(1,220)
Unrealized Appreciation	380,677	185,052
Unrealized Depreciation	(55,231)	(37,767)
Market Value	7,149,026	6,374,946
OTTI in AOCI		469
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,540,809	892,373
Allowance for credit losses
Unrealized Appreciation	30,691	6,818
Unrealized Depreciation	(5,698)	(1,858)
Market Value	2,565,802	897,333
OTTI in AOCI
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	915,923	814,570
Allowance for credit losses
Unrealized Appreciation	75,275	31,236
Unrealized Depreciation	(895)	(1,249)
Market Value	990,303	844,557
OTTI in AOCI
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,206,139	2,173,099
Allowance for credit losses
Unrealized Appreciation	64,663	36,361
Unrealized Depreciation	(3,063)	(10,879)
Market Value	2,267,739	2,198,581
OTTI in AOCI
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,187	5,723
Allowance for credit losses
Unrealized Appreciation	9
Unrealized Depreciation	(2)	(20)
Market Value	5,194	5,703
OTTI in AOCI
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,565,260	1,492,315
Allowance for credit losses	(22)
Unrealized Appreciation	102,587	47,148
Unrealized Depreciation	(22,450)	(33,513)
Market Value	1,645,375	1,505,950
OTTI in AOCI		71
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,297,898	2,870,737
Allowance for credit losses	(503)
Unrealized Appreciation	204,023	107,999
Unrealized Depreciation	(29,085)	(33,580)
Market Value	$ 3,472,333	2,945,156
OTTI in AOCI		$ 447

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- Definition

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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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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