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Accrued Restructuring and Other Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs $ 12 $ (87) $ 1 $ (87)
Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring     (33) (12)
Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring     (10) (3)
Restructuring Reserve, Ending Balance 20   20  
Information Technology | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring     (6) 0
Professional fees and other expenses | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Payments for Restructuring     (17) (9)
Other Operating Income (Expense) [Member] | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs     (1) (87)
Other Operating Income (Expense) [Member] | Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs     (24) (78)
Other Operating Income (Expense) [Member] | Information Technology | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs     (6) 0
Other Operating Income (Expense) [Member] | Professional fees and other expenses | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other costs     (17) (9)
Other liabilities | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance     54 0
Restructuring Reserve, Ending Balance 20 75 20 75
Other liabilities | Employee Severance | Hartford Next Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance     54 0
Restructuring Reserve, Ending Balance 20 75 20 75
Restructuring Reserve, Period Increase (Decrease)       24
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