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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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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 |  | $ 890,969 |
Fixed maturity securities, available for sale, due after one year through five years, amortized cost |  | 6,970,380 |
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost |  | 7,771,264 |
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost |  | 9,332,336 |
Fixed maturity securities, available for sale, due after twenty years, amortized cost |  | 6,481,165 |
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost |  | 31,446,114 |
Fixed maturity securities, available for sale, amortized cost | [1] | 42,114,459 | $ 42,304,736
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, due in one year or less, fair value |  | 899,102 |
Fixed maturity securities, available for sale, due after one year through five years, fair value |  | 7,416,931 |
Fixed maturity securities, available for sale, due after five years through ten years, fair value |  | 8,448,559 |
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value |  | 10,859,556 |
Fixed maturity securities, available for sale, due after twenty years, fair value |  | 7,182,073 |
Fixed maturity securities, available for sale, securities with a single maturity date, fair value |  | 34,806,221 |
Fixed maturity securities, available for sale, fair value |  | 45,690,341 | 47,538,893
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 |  | 1,263,013 |
Fixed maturity securities, available for sale, amortized cost | [1] | 1,263,013 | 1,399,956
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value |  | 1,346,473 |
Fixed maturity securities, available for sale, fair value |  | 1,346,473 | 1,512,831
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 |  | 4,019,810 |
Fixed maturity securities, available for sale, amortized cost | [1] | 4,019,810 | 4,119,650
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value |  | 4,177,242 |
Fixed maturity securities, available for sale, fair value |  | 4,177,242 | 4,261,227
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 |  | 5,385,522 |
Fixed maturity securities, available for sale, amortized cost | [1] | 5,385,522 | 5,593,169
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value |  | 5,360,405 |
Fixed maturity securities, available for sale, fair value |  | $ 5,360,405 | $ 5,549,849
[1] | Amortized cost excludes accrued interest receivable of $389.2 million and $377.5 million as of March 31, 2021 and December 31, 2020, respectively.

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