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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 36,009,821 | $ 38,537,462
Fair value | 32,044,379 | 34,780,482
Fixed Maturities, NAIC Rated Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 35,791,759 | 38,287,252
Fair value | 31,850,067 | 34,513,428
NAIC, Class 1 Designation |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 21,333,429 | 22,493,843
Fair value | 18,916,331 | 20,209,842
NAIC, Class 2 Designation |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 13,523,795 | 14,910,687
Fair value | 12,096,461 | 13,529,169
NAIC, Class 3 Designation |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 657,003 | 583,131
Fair value | 613,090 | 527,556
NAIC, Class 4 Designation |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 183,294 | 201,610
Fair value | 152,918 | 168,191
NAIC, Class 5 Designation |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 88,840 | 88,581
Fair value | 67,345 | 68,538
NAIC, Class 6 Designation |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 5,398 | 9,400
Fair value | 3,922 | 10,132
Fixed Maturities, Residual Tranche Securities, Not Rated |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 218,062 | 250,210
Fair value | $ 194,312 | $ 267,054

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