Restructuring and Other Costs, Before Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		36 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	$ 3	$ 2	$ 3	$ 7
Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			(7)	(16)
Hartford Next Program | Other liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			7	18
Restructuring Reserve, Ending Balance	3	9	3	9	$ 3
Employee Severance | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			(1)	(2)
Employee Severance | Hartford Next Program | Other liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			7	18
Restructuring Reserve, Ending Balance	3	9	3	9	3
Information Technology | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			(2)	(5)
Information Technology | Hartford Next Program | Other liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			0	0
Restructuring Reserve, Ending Balance	0	0	0	0	0
Professional fees and other expenses | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			(4)	(9)
Professional fees and other expenses | Hartford Next Program | Other liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			0	0
Restructuring Reserve, Ending Balance	0	0	0	0	0
Other Operating Income (Expense) [Member] | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	3	2	3	7	121
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 other costs	0	(5)	(3)	(7)	38
Restructuring and Related Cost, Expected Cost	38		38		38
Other Operating Income (Expense) [Member] | Information Technology | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	1	3	2	5	21
Restructuring and Related Cost, Expected Cost	24		24		24
Other Operating Income (Expense) [Member] | Professional fees and other expenses | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	2	$ 4	4	$ 9	62
Restructuring and Related Cost, Expected Cost	$ 65		$ 65		$ 65