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Restructuring and Other Costs, Before Tax (Details) - USD ($)
$ in Millions
 12 Months Ended 54 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs $ 2 $ 6 $ 13  
Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 2 6 13 $ 127
Restructuring and Related Cost, Expected Cost 127     127
Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 0 (6) (7) 35
Restructuring and Related Cost, Expected Cost 35     35
Restructuring Reserve, Period Increase (Decrease)   6 7  
Information Technology | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 0 5 8 25
Restructuring and Related Cost, Expected Cost 25     25
Professional fees and other expenses | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 2 $ 7 $ 12 67
Restructuring and Related Cost, Expected Cost $ 67     $ 67