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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | $ 19,932,190 | $ 19,225,067
Fixed maturity securities - available for sale, Market Value | 20,407,480 | 20,040,173
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 | 1,548,669 | 1,365,793
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost | 6,510,731 | 6,529,189
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost | 4,895,574 | 4,414,211
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost | 1,102,085 | 1,247,816
Fixed maturity securities - available for sale, Due in one year or less, Market Value | 1,559,198 | 1,374,674
Fixed maturity securities - available for sale, Due after one year through five years, Market Value | 6,715,932 | 6,774,785
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value | 5,036,321 | 4,751,903
Fixed maturity securities - available for sale, Due after ten years, Market Value | 1,122,723 | 1,309,773
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 2,615,962 | 2,540,809
Fixed maturity securities - available for sale, Market Value | 2,635,771 | 2,565,802
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 992,442 | 915,923
Fixed maturity securities - available for sale, Market Value | 1,029,317 | 990,303
Agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 2,257,474 | 2,206,139
Fixed maturity securities - available for sale, Market Value | 2,298,973 | 2,267,739
Non-agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 9,253 | 5,187
Fixed maturity securities - available for sale, Market Value | $ 9,245 | $ 5,194

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