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Segment Information - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Income tax expense $ 443 $ 531 $ 383
Operating Segments | P&C Commercial Lines      
Segment Reporting Information [Line Items]      
Income tax expense 426 402 176
Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Income tax expense 22 95 184
Operating Segments | Property & Casualty Other Operations      
Segment Reporting Information [Line Items]      
Income tax expense (52) (28) (46)
Operating Segments | Group Benefits [Member]      
Segment Reporting Information [Line Items]      
Income tax expense 75 53 88
Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Income tax expense 41 56 44
Corporate      
Segment Reporting Information [Line Items]      
Income tax expense $ (69) $ (47) $ (63)