Segment Information - Non-insurance Revenue from Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Insurance Commissions and Fees	$ 328	$ 377	$ 1,031	$ 1,107
Other revenues	21	24	56	62
Non-insurance revenues with customers	348	399	1,088	1,170
Installment billing fees [Member] | Operating Segments [Member] | Commercial Lines
Segment Reporting Information [Line Items]
Insurance Commissions and Fees	10	8	29	25
Installment billing fees [Member] | Operating Segments [Member] | Personal Lines
Segment Reporting Information [Line Items]
Insurance Commissions and Fees	8	8	23	24
Insurance servicing revenues | Operating Segments [Member] | Personal Lines
Segment Reporting Information [Line Items]
Other revenues	20	22	56	62
Administrative services | Operating Segments [Member] | Group Benefits
Segment Reporting Information [Line Items]
Insurance Commissions and Fees	46	43	139	136
Advisor, distribution and other management fees | Operating Segments [Member] | Hartford Funds
Segment Reporting Information [Line Items]
Insurance Commissions and Fees	253	306	803	884
Investment management and other fees | Corporate
Segment Reporting Information [Line Items]
Insurance Commissions and Fees	11	12	37	38
Other | Corporate
Segment Reporting Information [Line Items]
Other revenues	$ 0	$ 0	$ 1	$ 1