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Restructuring and Other Costs, Before Tax (Details) - Other Operating Income (Expense) [Member] - Hartford Next Program
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost $ 0 $ 11 $ 115
Restructuring and Related Cost, Expected Cost 152 152 152
Employee Severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost (9) (9) 64
Restructuring and Related Cost, Expected Cost 64 64 64
Information Technology      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 2 4 6
Restructuring and Related Cost, Expected Cost 27 27 27
Professional fees and other expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 7 16 45
Restructuring and Related Cost, Expected Cost $ 61 $ 61 $ 61