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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | $ 41,852,088 | $ 42,304,736
Fixed maturity securities, available for sale, fair value | 46,659,256 | 47,538,893
NAIC, Class 1 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 23,059,347 | 23,330,149
Fixed maturity securities, available for sale, fair value | 25,937,900 | 26,564,542
NAIC, Class 2 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 17,496,467 | 17,312,485
Fixed maturity securities, available for sale, fair value | 19,387,062 | 19,377,013
NAIC, Class 3 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 1,094,635 | 1,292,124
Fixed maturity securities, available for sale, fair value | 1,135,994 | 1,299,455
NAIC, Class 4 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 145,730 | 282,049
Fixed maturity securities, available for sale, fair value | 147,401 | 256,651
NAIC, Class 5 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 31,813 | 29,396
Fixed maturity securities, available for sale, fair value | 29,418 | 16,288
NAIC, Class 6 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 24,096 | 58,533
Fixed maturity securities, available for sale, fair value | $ 21,481 | $ 24,944

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