v3.26.1
Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities, at fair value $ 60,809 $ 59,115
Assets at fair value 76,470 72,025
Fixed Income Securities Valued Based on Nonbinding Broker Quotes    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Assets at fair value 11 12
Municipal Not Rated by Third Party Credit Rating Agencies    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Assets at fair value 3 29
Recurring basis    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities, at fair value 60,809 59,115
Assets at fair value 76,409 71,993
Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Assets at fair value 560 516
Significant unobservable inputs (Level 3) | Recurring basis    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities, at fair value 344 308
Debt securities valued based on third-party discounted cash flow pricing models 203 146
Assets at fair value 499 $ 484
Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 117  
Minimum | Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Investment assets, useful life (in years) 10 years  
Maximum | Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Investment assets, useful life (in years) 12 years