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Restructuring and Related Activities (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
Payments for Restructuring (2) (13)    
Restructuring and Related Cost, Expected Cost 127     127
Hartford Next Program | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 0 (6) (7) 35
Payments for Restructuring 0 (1)    
Restructuring Reserve, Period Increase (Decrease)   6 7  
Restructuring and Related Cost, Expected Cost 35     35
Hartford Next Program | Information Technology        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 0 5 8 25
Payments for Restructuring 0 (5)    
Restructuring and Related Cost, Expected Cost 25     25
Hartford Next Program | Professional fees and other expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 2 7 12 67
Payments for Restructuring (2) (7)    
Restructuring and Related Cost, Expected Cost 67     67
Hartford Next Program | Other liabilities        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve 0 0 7 0
Hartford Next Program | Other liabilities | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve 0 0 7 0
Hartford Next Program | Other liabilities | Information Technology        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve 0 0 0 0
Hartford Next Program | Other liabilities | Professional fees and other expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve $ 0 $ 0 $ 0 $ 0