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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | $ 37,813,550 | $ 44,866,019 |
Fair value | 32,084,932 | 39,804,617 | [1]
Fixed Maturities, NAIC Rated Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 37,755,156 | 44,866,019 |
Fair value | 32,004,591 | 39,804,617 |
NAIC, Class 1 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 22,103,730 | 27,061,903 |
Fair value | 18,644,092 | 24,211,086 |
NAIC, Class 2 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 14,909,260 | 17,023,157 |
Fair value | 12,739,371 | 14,944,131 |
NAIC, Class 3 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 554,568 | 595,193 |
Fair value | 469,819 | 510,392 |
NAIC, Class 4 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 116,264 | 109,409 |
Fair value | 98,929 | 91,495 |
NAIC, Class 5 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 61,334 | 61,721 |
Fair value | 45,253 | 36,738 |
NAIC, Class 6 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 10,000 | 14,636 |
Fair value | 7,127 | $ 10,775 |
Fixed Maturities, Residual Tranche Securities, Not Rated |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 58,394 |  |
Fair value | $ 80,341 |  |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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