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Consolidated Balance Sheets (Parenthetical) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Statement of Financial Position [Abstract] |  |
Amortized cost | $ 1,871,260,000 | $ 2,094,826,000
Allowance for credit losses for available-for-sale securities | $ 0 | $ 0
Common Stock, stated value (in dollars per share) | $ 1 | $ 1
Common Stock, shares authorized (in shares) | 45,000,000 | 45,000,000

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