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Restructuring and Other Costs, Before Tax (Details) - USD ($)
$ in Millions
3 Months Ended 33 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]      
Restructuring and other costs $ 0 $ 5  
Hartford Next Program      
Restructuring Cost and Reserve [Line Items]      
Payments for Restructuring (3) (7)  
Hartford Next Program | Other liabilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 7 18  
Restructuring Reserve, Ending Balance 4 16 $ 4
Employee Severance | Hartford Next Program      
Restructuring Cost and Reserve [Line Items]      
Payments for Restructuring 0 0  
Employee Severance | Hartford Next Program | Other liabilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 7 18  
Restructuring Reserve, Ending Balance 4 16 4
Information Technology | Hartford Next Program      
Restructuring Cost and Reserve [Line Items]      
Payments for Restructuring (1) (2)  
Information Technology | Hartford Next Program | Other liabilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 0 0  
Restructuring Reserve, Ending Balance 0 0 0
Professional fees and other expenses | Hartford Next Program      
Restructuring Cost and Reserve [Line Items]      
Payments for Restructuring (2) (5)  
Professional fees and other expenses | Hartford Next Program | Other liabilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 0 0  
Restructuring Reserve, Ending Balance 0 0 0
Other Operating Income (Expense) [Member] | Hartford Next Program      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other costs 0 5 118
Restructuring and Related Cost, Expected Cost 121   121
Other Operating Income (Expense) [Member] | Employee Severance | Hartford Next Program      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other costs (3) (2) 38
Restructuring and Related Cost, Expected Cost 38   38
Other Operating Income (Expense) [Member] | Information Technology | Hartford Next Program      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other costs 1 2 20
Restructuring and Related Cost, Expected Cost 23   23
Other Operating Income (Expense) [Member] | Professional fees and other expenses | Hartford Next Program      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other costs 2 $ 5 60
Restructuring and Related Cost, Expected Cost $ 60   $ 60