Segment Information - Net Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net income	$ 442	$ 905	$ 887	$ 1,154
Preferred stock dividends	5	5	10	10
Net income available to common stockholders	437	900	877	1,144
Corporate
Segment Reporting Information [Line Items]
Net income	(71)	(21)	(130)	(79)
Commercial Lines | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	389	569	772	698
Personal Lines | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	6	118	83	253
Property & Casualty Other Operations | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	(20)	17	(12)	4
Group Benefits | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	104	170	98	179
Hartford Funds | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	$ 34	$ 52	$ 76	$ 99