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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | $ 41,247,540 | $ 42,304,736
Fixed maturity securities, available for sale, fair value | 45,738,097 | 47,538,893
NAIC, Class 1 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 22,823,664 | 23,330,149
Fixed maturity securities, available for sale, fair value | 25,508,437 | 26,564,542
NAIC, Class 2 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 17,170,505 | 17,312,485
Fixed maturity securities, available for sale, fair value | 18,928,256 | 19,377,013
NAIC, Class 3 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 1,066,599 | 1,292,124
Fixed maturity securities, available for sale, fair value | 1,107,418 | 1,299,455
NAIC, Class 4 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 145,455 | 282,049
Fixed maturity securities, available for sale, fair value | 157,196 | 256,651
NAIC, Class 5 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 17,226 | 29,396
Fixed maturity securities, available for sale, fair value | 15,860 | 16,288
NAIC, Class 6 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 24,091 | 58,533
Fixed maturity securities, available for sale, fair value | $ 20,930 | $ 24,944

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