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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | $ 49,364,915 | $ 46,999,183
Fixed maturity securities, available for sale, fair value | 49,662,120 | 51,305,943
NAIC, Class 1 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 27,701,587 | 26,157,531
Fixed maturity securities, available for sale, fair value | 28,064,072 | 28,785,839
NAIC, Class 2 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 20,740,585 | 19,758,594
Fixed maturity securities, available for sale, fair value | 20,701,013 | 21,396,020
NAIC, Class 3 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 772,726 | 909,311
Fixed maturity securities, available for sale, fair value | 748,881 | 941,210
NAIC, Class 4 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 117,725 | 133,070
Fixed maturity securities, available for sale, fair value | 122,867 | 147,160
NAIC, Class 5 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 3,259 | 16,496
Fixed maturity securities, available for sale, fair value | 3,259 | 15,357
NAIC, Class 6 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 29,033 | 24,181
Fixed maturity securities, available for sale, fair value | $ 22,028 | $ 20,357

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