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Segment Information - Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 196 | $ 432 | $ 582 | $ 597 | $ (3,703) | $ 234 | $ (40) | $ 378 | $ 1,807 | $ (3,131) | $ 896
Preferred stock dividends | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 0
Net income (loss) available to common stockholders | $ 190 | $ 432 | $ 582 | $ 597 | $ (3,703) | $ 234 | $ (40) | $ 378 | 1,801 | (3,131) | 896
Commercial Lines |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 1,212 | 865 | 994
Personal Lines |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (32) | (9) | (9)
Property & Casualty Other Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 15 | 69 | (529)
Group Benefits |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 340 | 294 | 230
Hartford Funds |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 148 | 106 | 78
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ 124 | $ (4,456) | $ 132

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