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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 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 | $ 1,285,124 |
Fixed maturity securities, available for sale, due after one year through five years, amortized cost | 8,050,284 |
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost | 7,228,862 |
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost | 10,741,247 |
Fixed maturity securities, available for sale, due after twenty years, amortized cost | 10,551,772 |
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost | 37,857,289 |
Fixed maturity securities, available for sale, amortized cost | 49,364,915 | $ 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 | 1,294,473 |
Fixed maturity securities, available for sale, due after one year through five years, fair value | 8,089,245 |
Fixed maturity securities, available for sale, due after five years through ten years, fair value | 7,278,595 |
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value | 11,453,442 |
Fixed maturity securities, available for sale, due after twenty years, fair value | 10,188,959 |
Fixed maturity securities, available for sale, securities with a single maturity date, fair value | 38,304,714 |
Fixed maturity securities, available for sale, fair value | 49,662,120 | $ 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 | 1,195,436 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 1,210,559 |
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 | 4,873,980 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 4,769,867 |
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 | 5,438,210 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | $ 5,376,980 |

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