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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | $ 44,866,019 | $ 46,999,183
Fixed maturity securities, available for sale |  | 39,804,617 | 51,305,943
NAIC, Class 1 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 27,061,903 | 26,157,531
Fixed maturity securities, available for sale |  | 24,211,086 | 28,785,839
NAIC, Class 2 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 17,023,157 | 19,758,594
Fixed maturity securities, available for sale |  | 14,944,131 | 21,396,020
NAIC, Class 3 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 595,193 | 909,311
Fixed maturity securities, available for sale |  | 510,392 | 941,210
NAIC, Class 4 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 109,409 | 133,070
Fixed maturity securities, available for sale |  | 91,495 | 147,160
NAIC, Class 5 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 61,721 | 16,496
Fixed maturity securities, available for sale |  | 36,738 | 15,357
NAIC, Class 6 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 14,636 | 24,181
Fixed maturity securities, available for sale |  | $ 10,775 | $ 20,357
[1] | Amortized cost excludes accrued interest receivable of $425.4 million and $400.7 million as of December 31, 2022 and 2021, respectively.

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