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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, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 22,693,029	$ 22,063,592
Fixed maturity securities - available for sale, Market Value	21,998,415	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	1,391,977	1,398,742
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	7,302,421	7,075,077
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	4,896,715	5,003,792
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	1,640,754	1,606,298
Fixed maturity securities - available for sale, Amortized Cost	22,693,029	22,063,592
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,391,679	1,398,006
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	7,112,007	7,154,468
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	4,673,737	5,100,672
Fixed maturity securities - available for sale, Due after ten years, Market Value	1,542,088	1,627,163
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	4,046,636	3,579,439
Fixed maturity securities - available for sale, Market Value	3,997,891	3,581,729
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	1,021,013	1,032,506
Fixed maturity securities - available for sale, Market Value	991,871	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	2,387,754	2,361,208
Fixed maturity securities - available for sale, Market Value	2,283,497	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	5,759	6,530
Fixed maturity securities - available for sale, Market Value	$ 5,645	$ 6,536

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