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Segment Information - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Income tax expense $ 531 $ 383 $ 475
Operating Segments | P&C Commercial Lines      
Segment Reporting Information [Line Items]      
Income tax expense 402 176 270
Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Income tax expense 95 184 76
Operating Segments | Property & Casualty Other Operations      
Segment Reporting Information [Line Items]      
Income tax expense (28) (46) 12
Operating Segments | Group Benefits [Member]      
Segment Reporting Information [Line Items]      
Income tax expense 53 88 126
Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Income tax expense 56 44 37
Corporate      
Segment Reporting Information [Line Items]      
Income tax expense $ (47) $ (63) $ (46)