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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
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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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