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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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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 |  | $ 1,184,147 |
Fixed maturity securities, available for sale, due after one year through five years, amortized cost |  | 5,641,072 |
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost |  | 6,254,569 |
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost |  | 9,853,998 |
Fixed maturity securities, available for sale, due after twenty years, amortized cost |  | 10,051,313 |
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost |  | 32,985,099 |
Fixed maturity securities, available for sale, amortized cost | [1] | 44,866,019 | $ 46,999,183
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, due in one year or less, fair value |  | 1,180,124 |
Fixed maturity securities, available for sale, due after one year through five years, fair value |  | 5,406,059 |
Fixed maturity securities, available for sale, due after five years through ten years, fair value |  | 5,672,730 |
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value |  | 8,817,815 |
Fixed maturity securities, available for sale, due after twenty years, fair value |  | 7,754,098 |
Fixed maturity securities, available for sale, securities with a single maturity date, fair value |  | 28,830,826 |
Fixed maturity securities, available for sale |  | 39,804,617 | 51,305,943
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 |  | 1,492,242 |
Fixed maturity securities, available for sale, amortized cost | [1] | 1,492,242 | 1,056,778
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value |  | 1,377,611 |
Fixed maturity securities, available for sale |  | 1,377,611 | 1,125,049
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 |  | 4,098,755 |
Fixed maturity securities, available for sale, amortized cost | [1] | 4,098,755 | 4,708,878
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value |  | 3,687,478 |
Fixed maturity securities, available for sale |  | 3,687,478 | 4,840,311
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 |  | 6,289,923 |
Fixed maturity securities, available for sale, amortized cost | [1] | 6,289,923 | 5,226,660
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value |  | 5,908,702 |
Fixed maturity securities, available for sale |  | $ 5,908,702 | $ 5,271,857
[1] | Amortized cost excludes accrued interest receivable of $425.4 million and $400.7 million as of December 31, 2022 and 2021, respectively.

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