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Accrued Restructuring and Other Costs (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)    
Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (1) (4)    
Information Technology | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (5) (8)    
Professional fees and other expenses | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring (7) (12)    
Other Operating Income (Expense) [Member] | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 6 13 1 $ 124
Other Operating Income (Expense) [Member] | Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs (6) (7) (25) 35
Other Operating Income (Expense) [Member] | Information Technology | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 5 8 9 25
Other Operating Income (Expense) [Member] | Professional fees and other expenses | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs 7 12 17 64
Other liabilities | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance 7 18    
Restructuring Reserve, Ending Balance 0 7 18 0
Other liabilities | Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance 7 18    
Restructuring Reserve, Ending Balance 0 7 18 0
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