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Restructuring and Other Costs, Before Tax (Details) - USD ($)
$ in Millions
 12 Months Ended 30 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs $ 13 $ 1 $ 104  
Employee Severance | Hartford Next Program | Other liabilities        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Period Increase (Decrease) 7 25    
Other Operating Income (Expense) [Member] | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 13 1 104 $ 118
Restructuring and Related Cost, Expected Cost 125     125
Other Operating Income (Expense) [Member] | Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs (7) (25) 73 41
Restructuring and Related Cost, Expected Cost 41     41
Other Operating Income (Expense) [Member] | Information Technology | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 8 9 2 19
Restructuring and Related Cost, Expected Cost 24     24
Other Operating Income (Expense) [Member] | Professional fees and other expenses | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 12 $ 17 $ 29 58
Restructuring and Related Cost, Expected Cost $ 60     $ 60