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Restructuring and Other Costs, Before Tax (Details) - Other Operating Income (Expense) [Member] - Hartford Next Program - USD ($)
$ in Millions
 12 Months Ended 18 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost $ 1 $ 104 $ 105
Restructuring and Related Cost, Expected Cost 130   130
Employee Severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 25 73 48
Restructuring and Related Cost, Expected Cost 48   48
Information Technology      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 9 2 11
Restructuring and Related Cost, Expected Cost 21   21
Professional fees and other expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 17 $ 29 46
Restructuring and Related Cost, Expected Cost $ 61   $ 61