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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Fixed maturity securities, available for sale, due in one year or less, amortized cost | $ 635,069 |
Fixed maturity securities, available for sale, due after one year through five years, amortized cost | 5,295,239 |
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost | 4,174,379 |
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost | 7,149,272 |
Fixed maturity securities, available for sale, due after twenty years, amortized cost | 8,632,830 |
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost | 25,886,789 |
Amortized Cost | 36,009,821 | $ 38,537,462
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, due in one year or less, fair value | 628,657 |
Fixed maturity securities, available for sale, due after one year through five years, fair value | 5,166,955 |
Fixed maturity securities, available for sale, due after five years through ten years, fair value | 3,788,971 |
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value | 6,209,035 |
Fixed maturity securities, available for sale, due after twenty years, fair value | 6,748,289 |
Fixed maturity securities, available for sale, securities with a single maturity date, fair value | 22,541,907 |
Fair Value | 32,044,379 | 34,780,482
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 | 1,093,654 |
Amortized Cost | 1,093,654 | 1,503,639
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 995,130 |
Fair Value | 995,130 | 1,402,501
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 | 3,121,755 |
Amortized Cost | 3,121,755 | 3,405,647
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 2,734,085 |
Fair Value | 2,734,085 | 2,952,547
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 | 5,907,623 |
Amortized Cost | 5,907,623 | 6,200,170
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 5,773,257 |
Fair Value | $ 5,773,257 | $ 6,058,198

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