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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)

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