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Segment Information - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Income tax expense $ 383 $ 475 $ 268
Operating Segments | P&C Commercial Lines      
Segment Reporting Information [Line Items]      
Income tax expense 176 270 267
Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Income tax expense 184 76 (19)
Operating Segments | Property & Casualty Other Operations      
Segment Reporting Information [Line Items]      
Income tax expense (46) 12 (7)
Operating Segments | Group Benefits [Member]      
Segment Reporting Information [Line Items]      
Income tax expense 88 126 84
Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Income tax expense 44 37 38
Corporate      
Segment Reporting Information [Line Items]      
Income tax expense $ (63) $ (46) $ (95)