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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 2,941 $ 2,778
Fixed income securities 48,865 42,485
Total assets at fair value 56,409 51,358
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 26 70
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 11 21
Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Total assets at fair value 691 641
Recurring Basis    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities 48,865 42,485
Total assets at fair value 56,394 51,335
Recurring Basis | Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities 153 173
Total assets at fair value 676 $ 618
Fair Value    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 175  
Fair Value | Minimum    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Investment assets, useful life 10 years  
Fair Value | Maximum    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Investment assets, useful life 12 years