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v3.25.0.1

Summary of Significant Accounting Policies (Recent accounting change) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net after tax unamortized periodic pension cost | $ (8,407,439) | $ (7,469,237) |  |
Fixed maturity securities, allowance for credit loss | 671 | 36,751 |  |
Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net after tax unamortized periodic pension cost | (12,265,070) | (11,040,908) | $ (10,161,005) | $ (9,015,135)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net after tax unamortized periodic pension cost | $ 517,170 | $ 586,354 | $ 892,905 | $ (90,900)

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- Definition Line items represent financial concepts included in a table. 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