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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 19,225,067	$ 16,473,491
Fixed maturity securities - available for sale, Market Value	20,040,173	16,824,944
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	1,365,793	1,456,960
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	6,529,189	6,757,107
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	4,414,211	3,471,370
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	1,247,816	902,289
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,374,674	1,457,919
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	6,774,785	6,869,359
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	4,751,903	3,609,816
Fixed maturity securities - available for sale, Due after ten years, Market Value	1,309,773	941,676
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,540,809	892,373
Fixed maturity securities - available for sale, Market Value	2,565,802	897,333
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	915,923	814,570
Fixed maturity securities - available for sale, Market Value	990,303	844,557
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,206,139	2,173,099
Fixed maturity securities - available for sale, Market Value	2,267,739	2,198,581
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	5,187	5,723
Fixed maturity securities - available for sale, Market Value	$ 5,194	$ 5,703

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