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Restructuring and Other Costs, Before Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 51 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs $ 1 $ 1 $ 2 $ 4  
Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs 1 1 2 4 $ 127
Employee Severance | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs 0 (2) 0 (5) 35
Information Technology | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs 0 2 0 4 25
Professional fees and other expenses | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other costs 1 $ 1 2 $ 5 67
Other Operating Income (Expense) [Member] | Hartford Next Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 127   127   127
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 $ 67   $ 67   $ 67