Segment Information - Net Income (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]
Net income	$ 339	$ 482	$ 1,226	$ 1,636
Preferred stock dividends	6	6	16	16
Net income available to common stockholders	333	476	1,210	1,620
Corporate
Segment Reporting Information [Line Items]
Net income	(44)	(32)	(174)	(111)
Commercial Lines | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	286	357	1,058	1,055
Personal Lines | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	(36)	51	47	304
Property & Casualty Other Operations | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	6	22	(6)	26
Group Benefits | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	86	28	184	207
Hartford Funds | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	$ 41	$ 56	$ 117	$ 155