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Restructuring and Other Costs, Before Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 48 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs $ 0 $ 3 $ 1 $ 3  
Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs 0 3 1 3 $ 125
Employee Severance | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs 0 0 0 (3) 35
Information Technology | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs 0 1 0 2 25
Professional fees and other expenses | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs 0 $ 2 1 $ 4 65
Other Operating Income (Expense) [Member] | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 126   126   126
Other Operating Income (Expense) [Member] | Employee Severance | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 35   35   35
Other Operating Income (Expense) [Member] | Information Technology | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 25   25   25
Other Operating Income (Expense) [Member] | Professional fees and other expenses | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost $ 66   $ 66   $ 66