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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 3,345,000,000 $ 2,941,000,000
Fixed income securities 52,747,000,000 48,865,000,000
Total assets at fair value 63,521,000,000 56,409,000,000
Fixed Income Securities Valued Based on Nonbinding Broker Quotes    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Total assets at fair value 22,000,000 26,000,000
Municipal Not Rated by Third Party Credit Rating Agencies    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Total assets at fair value 2,000,000 11,000,000
Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Total assets at fair value 805,000,000 691,000,000
Recurring Basis    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities 52,747,000,000 48,865,000,000
Total assets at fair value 63,518,000,000 56,394,000,000
Recurring Basis | Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities 248,000,000 153,000,000
Debt securities valued based on third-party discounted cash flow pricing models 87,000,000 0
Total assets at fair value 802,000,000 $ 676,000,000
Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 158,000,000  
Limited partnership interests | Minimum    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Investment assets, useful life (in years) 10 years  
Limited partnership interests | Maximum    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Investment assets, useful life (in years) 12 years