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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | $ 38,537,462 | $ 44,866,019 |
Fair value | 34,780,482 | 39,804,617 | [1]
NAIC, Class 1 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 22,493,843 | 27,061,903 |
Fair value | 20,209,842 | 24,211,086 |
NAIC, Class 2 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 14,910,687 | 17,023,157 |
Fair value | 13,529,169 | 14,944,131 |
NAIC, Class 3 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 583,131 | 595,193 |
Fair value | 527,556 | 510,392 |
NAIC, Class 4 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 201,610 | 109,409 |
Fair value | 168,191 | 91,495 |
NAIC, Class 5 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 88,581 | 61,721 |
Fair value | 68,538 | 36,738 |
NAIC, Class 6 Designation |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 9,400 | 14,636 |
Fair value | 10,132 | 10,775 |
Fixed Maturities, NAIC Rated Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 38,287,252 | 44,866,019 |
Fair value | 34,513,428 | $ 39,804,617 |
Fixed Maturities, Residual Tranche Securities, Not Rated |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 250,210 |  |
Fair value | $ 267,054 |  |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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