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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	Jun. 30, 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	$ 16,646,452	$ 8,094,261
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,251,844)	(127,800)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	2,291,464	1,240,691
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(313,749)	(75,330)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	18,937,916	9,334,952
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,565,593)	(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	16,639,239
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,250,755)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	2,291,464
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(313,749)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	18,930,703
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,564,504)
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	949,790	504,168
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(39,469)	(6,264)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	199,364	91,735
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(15,102)	(4,094)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,149,154	595,903
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(54,571)	(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	210,645	51,094
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(21,935)	(1,038)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	12,067	2,558
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(2,366)	(112)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	222,712	53,652
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(24,301)	(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	4,911,170	2,132,576
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(420,055)	(38,316)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	779,916	472,831
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(104,127)	(24,264)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	5,691,086	2,605,407
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(524,182)	(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	3,623,327	1,954,079
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(180,189)	(11,180)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	42,484	41,823
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(3,052)	(668)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,665,811	1,995,902
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(183,241)	(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	926,417	221,852
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(69,573)	(2,854)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	21,217	40,496
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(3,247)	(2,836)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	947,634	262,348
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(72,820)	(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	1,939,847	1,101,215
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(116,105)	(12,178)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	579,272	279,697
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(70,551)	(6,695)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	2,519,119	1,380,912
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(186,656)	(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	4,402	2,320
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(188)	(14)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	739	156
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(20)	(2)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	5,141	2,476
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(208)	(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	972,856	392,447
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(73,986)	(9,709)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	177,226	100,673
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(41,435)	(18,370)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,150,082	493,120
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(115,421)	(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	3,100,785	1,734,510
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(329,255)	(46,247)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	479,179	210,722
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(73,849)	(18,289)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,579,964	1,945,232
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(403,104)	(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	7,213
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,089)
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	7,213	15,700
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (1,089)	$ (400)

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