Restructuring and Other Costs, Before Tax (Details) - Other Operating Income (Expense) [Member] - Hartford Next Program - USD ($) $ in Millions	3 Months Ended		21 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 5	$ 11	$ 110
Restructuring and Related Cost, Expected Cost	130		130
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	2	0	46
Restructuring and Related Cost, Expected Cost	46		46
Information Technology
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	2	2	13
Restructuring and Related Cost, Expected Cost	26		26
Professional fees and other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	5	$ 9	51
Restructuring and Related Cost, Expected Cost	$ 58		$ 58