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Segment Information - Net Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Net income	$ 445	$ 249
Preferred stock dividends	5	5
Net income available to common stockholders	440	244
Corporate
Segment Reporting Information [Line Items]
Net income	(59)	(58)
Commercial Lines | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	383	129
Personal Lines | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	77	135
Property & Casualty Other Operations | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	8	(13)
Group Benefits | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	(6)	9
Hartford Funds | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	$ 42	$ 47

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