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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | $ 23,408,417 | $ 22,063,592
Fixed maturity securities - available for sale | 21,880,443 | 22,308,272
Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Due in one year or less, Amortized Cost | 1,261,875 | 1,398,742
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost | 7,565,293 | 7,075,077
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost | 4,746,315 | 5,003,792
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost | 1,849,409 | 1,606,298
Fixed maturity securities - available for sale, Amortized Cost | 23,408,417 | 22,063,592
Fixed maturity securities - available for sale, Due in one year or less, Market Value | 1,263,628 | 1,398,006
Fixed maturity securities - available for sale, Due after one year through five years, Market Value | 7,187,705 | 7,154,468
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value | 4,285,866 | 5,100,672
Fixed maturity securities - available for sale, Due after ten years, Market Value | 1,596,674 | 1,627,163
Fixed maturity securities - available for sale | 21,880,443 | 22,308,272
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 4,081,011 | 3,579,439
Fixed maturity securities - available for sale | 3,898,679 | 3,581,729
Mortgage-Backed Securities: Commercial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 1,024,591 | 1,032,506
Fixed maturity securities - available for sale | 951,895 | 1,064,366
Mortgage Backed Securities: Agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 2,874,574 | 2,361,208
Fixed maturity securities - available for sale | 2,690,855 | 2,375,332
Mortgage Backed Securities: Non-agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 5,349 | 6,530
Fixed maturity securities - available for sale | $ 5,141 | $ 6,536

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