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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
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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