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Fair Value - Additional Information (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Item
Dec. 31, 2023
USD ($)
Item
Dec. 31, 2022
USD ($)
Fair Value Disclosures [Line Items]      
Fair value, assets, level 1 to level 2 transfers, amount $ 0 $ 0  
Fair value, assets, level 2 to level 1 transfers, amount 0 0  
Fair value, liabilities, level 1 to level 2 transfers, amount 0 0  
Fair value, liabilities, level 2 to level 1 transfers, amount 0 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 141,000,000 $ 145,000,000  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | Item 274 306  
Investment Income, Interest and Dividend $ 8,000,000 $ 7,000,000  
Other Investment Income      
Fair Value Disclosures [Line Items]      
Investment Income, Interest and Dividend     $ 6,000,000
Available-for-sale Securities      
Fair Value Disclosures [Line Items]      
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 0