Accrued Restructuring and Other Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		27 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	$ 3	$ (12)	$ 10	$ (1)
Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			(21)	(33)
Employee Severance | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			(4)	(10)
Information Technology | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			(6)	(6)
Professional fees and other expenses | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			(11)	(17)
Other Operating Income (Expense) [Member] | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	3	(12)	10	(1)	$ 115
Other Operating Income (Expense) [Member] | Employee Severance | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	0	(15)	(7)	(24)	41
Other Operating Income (Expense) [Member] | Information Technology | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	1	2	6	6	17
Other Operating Income (Expense) [Member] | Professional fees and other expenses | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs	2	1	11	17	57
Other liabilities | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			18	54
Restructuring Reserve, Ending Balance	7	20	7	20	7
Other liabilities | Employee Severance | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			18	54
Restructuring Reserve, Ending Balance	7	20	7	20	7
Other liabilities | Information Technology | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			0	0
Restructuring Reserve, Ending Balance	0	0	0	0	0
Other liabilities | Professional fees and other expenses | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			0	0
Restructuring Reserve, Ending Balance	$ 0	$ 0	$ 0	$ 0	$ 0