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Segment Information - Income Tax Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Income tax expense | $ 475 | $ 268 | $ 985
Commercial Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense | 270 | 267 | 377
Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense | 76 | (19) | 26
Property & Casualty Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense | 12 | (7) | 24
Group Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense | 126 | 84 | 38
Hartford Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense | 37 | 38 | 63
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense | $ (46) | $ (95) | $ 457

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