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Restructuring and Related Activities (Details) - USD ($)
$ in Millions
 12 Months Ended 42 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs $ 6 $ 13 $ 1  
Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (13) (24)    
Hartford Next Program | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (1) (4)    
Hartford Next Program | Information Technology        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (5) (8)    
Hartford Next Program | Professional fees and other expenses        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (7) (12)    
Hartford Next Program | Other liabilities        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve 0 7 18 $ 0
Hartford Next Program | Other liabilities | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve 0 7 18 0
Restructuring Reserve, Period Increase (Decrease) 6 7    
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
Other Operating Income (Expense) [Member] | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 6 13 1 124
Restructuring and Related Cost, Expected Cost 126     126
Other Operating Income (Expense) [Member] | Hartford Next Program | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs (6) (7) (25) 35
Restructuring and Related Cost, Expected Cost 35     35
Other Operating Income (Expense) [Member] | Hartford Next Program | Information Technology        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 5 8 9 25
Restructuring and Related Cost, Expected Cost 25     25
Other Operating Income (Expense) [Member] | Hartford Next Program | Professional fees and other expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 7 $ 12 $ 17 64
Restructuring and Related Cost, Expected Cost $ 66     $ 66