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Accrued Restructuring and Other Costs (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  
Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (24) (37)    
Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (4) (11)    
Information Technology | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (8) (9)    
Professional fees and other expenses | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (12) (17)    
Other Operating Income (Expense) [Member] | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 13 1 104 $ 118
Other Operating Income (Expense) [Member] | Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs (7) (25) 73 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
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
Other liabilities | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance 18 54    
Restructuring Reserve, Ending Balance 7 18 54 7
Other liabilities | Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance 18 54    
Restructuring Reserve, Ending Balance 7 18 54 7
Other liabilities | Information Technology | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance 0 0    
Restructuring Reserve, Ending Balance 0 0 0 0
Other liabilities | Professional fees and other expenses | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance 0 0    
Restructuring Reserve, Ending Balance $ 0 $ 0 $ 0 $ 0