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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Fixed maturity securities, available for sale, due in one year or less, amortized cost	$ 1,371,424
Fixed maturity securities, available for sale, due after one year through five years, amortized cost	4,924,030
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost	4,686,405
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost	7,569,350
Fixed maturity securities, available for sale, due after twenty years, amortized cost	8,876,797
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost	27,428,006
Amortized cost	38,537,462	$ 44,866,019
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Fixed maturity securities, available for sale, due in one year or less, fair value	1,368,322
Fixed maturity securities, available for sale, due after one year through five years, fair value	4,787,802
Fixed maturity securities, available for sale, due after five years through ten years, fair value	4,325,294
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value	6,754,603
Fixed maturity securities, available for sale, due after twenty years, fair value	7,131,215
Fixed maturity securities, available for sale, securities with a single maturity date, fair value	24,367,236
Fair value	34,780,482	39,804,617	[1]
Residential mortgage backed securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost	1,503,639
Amortized cost	1,503,639	1,492,242
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Fixed maturity securities, available for sale, securities without a single maturity date, fair value	1,402,501
Fair value	1,402,501	1,377,611
Commercial mortgage backed securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost	3,405,647
Amortized cost	3,405,647	4,098,755
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Fixed maturity securities, available for sale, securities without a single maturity date, fair value	2,952,547
Fair value	2,952,547	3,687,478
Other asset backed securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost	6,200,170
Amortized cost	6,200,170	6,289,923
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Fixed maturity securities, available for sale, securities without a single maturity date, fair value	6,058,198
Fair value	$ 6,058,198	$ 5,908,702
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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