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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 3,244 $ 3,345
Fixed income securities 59,115 52,747
Total assets at fair value 72,025 63,521
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 12 22
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 29 2
Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Total assets at fair value 516 805
Recurring Basis    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities 59,115 52,747
Total assets at fair value 71,993 63,518
Recurring Basis | Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities 308 248
Debt securities valued based on third-party discounted cash flow pricing models 146 87
Total assets at fair value 484 $ 802
Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 125  
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