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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 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	$ 1,425,811
Fixed maturity securities, available for sale, due after one year through five years, amortized cost	4,298,107
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost	4,868,547
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost	7,384,698
Fixed maturity securities, available for sale, due after twenty years, amortized cost	9,199,778
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost	27,176,941
Amortized Cost	37,813,550	$ 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	1,423,194
Fixed maturity securities, available for sale, due after one year through five years, fair value	4,048,402
Fixed maturity securities, available for sale, due after five years through ten years, fair value	4,242,544
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value	6,057,753
Fixed maturity securities, available for sale, due after twenty years, fair value	6,595,269
Fixed maturity securities, available for sale, securities with a single maturity date, fair value	22,367,162
Fair Value	32,084,932	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	1,501,200
Amortized Cost	1,501,200	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	1,342,984
Fair Value	1,342,984	1,377,611
Commercial Mortgage-Backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost	3,520,832
Amortized Cost	3,520,832	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	2,983,030
Fair Value	2,983,030	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	5,614,577
Amortized Cost	5,614,577	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	5,391,756
Fair Value	$ 5,391,756	$ 5,908,702
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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