Restructuring and Related Activities (Details) - USD ($) $ in Millions	12 Months Ended			30 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	$ 13	$ 1	$ 104
Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring	(24)	(37)
Hartford Next Program | Employee Severance
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring	(4)	(11)
Hartford Next Program | Information Technology
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring	(8)	(9)
Hartford Next Program | Professional fees and other expenses
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring	(12)	(17)
Hartford Next Program | Other liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	7	18	54	$ 7
Hartford Next Program | Other liabilities | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	7	18	54	7
Restructuring Reserve, Period Increase (Decrease)	7	25
Hartford Next Program | Other liabilities | Information Technology
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	0	0
Hartford Next Program | Other liabilities | Professional fees and other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	0	0
Other Operating Income (Expense) [Member] | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	13	1	104	118
Other Operating Income (Expense) [Member] | Hartford Next Program | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	(7)	(25)	73	41
Other Operating Income (Expense) [Member] | Hartford Next Program | Information Technology
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	8	9	2	19
Other Operating Income (Expense) [Member] | Hartford Next Program | Professional fees and other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	$ 12	$ 17	$ 29	$ 58