Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	$ 13,163,547	$ 8,094,261
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(597,201)	(127,800)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	2,149,506	1,240,691
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(209,551)	(75,330)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	15,313,053	9,334,952
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(806,752)	(203,130)
No Recorded Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	13,144,717
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(596,109)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	2,149,506
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(209,551)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	15,294,223
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(805,660)
Due In One Year Or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	170,052	129,860
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(2,305)	(2,415)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	105,909	136,827
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(9,957)	(11,832)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	275,961	266,687
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(12,262)	(14,247)
Due In One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	3,852,436	2,165,467
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(164,170)	(35,264)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	755,276	446,247
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(55,787)	(28,685)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	4,607,712	2,611,714
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(219,957)	(63,949)
Due in Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	2,843,780	1,727,823
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(178,654)	(47,413)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	628,985	244,454
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(82,375)	(22,038)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,472,765	1,972,277
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(261,029)	(69,451)
Due After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	1,099,724	791,645
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(102,342)	(16,482)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	86,196	50,991
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(14,147)	(2,574)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,185,920	842,636
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(116,489)	(19,056)
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	3,072,751	1,954,079
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(51,294)	(11,180)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	41,984	41,823
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(3,000)	(668)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,114,735	1,995,902
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(54,294)	(11,848)
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	2,105,974	1,325,387
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(97,344)	(15,046)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	531,156	320,349
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(44,285)	(9,533)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	2,637,130	1,645,736
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(141,629)	(24,579)
Recorded an Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	18,830
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,092)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	18,830	15,700
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (1,092)	$ (400)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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