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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type) (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)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	735,568	504,168
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(31,508)	(6,264)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	140,967	91,735
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(9,915)	(4,094)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	876,535	595,903
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(41,423)	(10,358)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	135,080	51,094
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(8,844)	(1,038)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	12,751	2,558
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1,683)	(112)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	147,831	53,652
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(10,527)	(1,150)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	3,552,799	2,132,576
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(191,372)	(38,316)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	804,526	472,831
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(71,842)	(24,264)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	4,357,325	2,605,407
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(263,214)	(62,580)
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: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	696,096	221,852
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(29,358)	(2,854)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	19,307	40,496
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(2,546)	(2,836)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	715,403	262,348
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(31,904)	(5,690)
Mortgage Backed Securities: Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	1,405,047	1,101,215
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(67,884)	(12,178)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	511,034	279,697
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(41,727)	(6,695)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,916,081	1,380,912
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(109,611)	(18,873)
Mortgage Backed Securities: Non-agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	4,831	2,320
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(102)	(14)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	815	156
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(12)	(2)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	5,646	2,476
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(114)	(16)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	868,416	392,447
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(37,826)	(9,709)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	173,278	100,673
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(31,144)	(18,370)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,041,694	493,120
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(68,970)	(28,079)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	2,674,129	1,734,510
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(177,921)	(46,247)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	444,844	210,722
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(47,682)	(18,289)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,118,973	1,945,232
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(225,603)	(64,536)
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)

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