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Property Casualty Loss and Loss Expenses - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters      
Reserve for loss and loss expenses $ 10,780   $ 10,003
Prior accident years (91) $ (100)  
Life Insurance Segment      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters      
Reserve for loss and loss expenses 73 68  
Commercial Insurance      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters      
Prior accident years (43) (38)  
Commercial Insurance | Commercial Property Line      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters      
Prior accident years (35) (22)  
Commercial Insurance | Workers' Compensation Line      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters      
Prior accident years (11) (12)  
Personal Insurance      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters      
Prior accident years (19) (33)  
Personal Insurance | Personal Auto      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters      
Prior accident years   (5)  
Personal Insurance | Homeowner      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters      
Prior accident years (19) (25)  
Excess and Surplus Lines Insurance      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters      
Prior accident years $ (9) $ (3)