Restructuring and Other Costs, Before Tax (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)
Other Operating Income (Expense) [Member] | Hartford Next Program
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	127		127		$ 127
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 Related Cost, Expected Cost	41		41		41
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 Related Cost, Expected Cost	26		26		26
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 Related Cost, Expected Cost	60		60		60
Restructuring and other costs	$ 2	$ 1	$ 11	$ 17	$ 57