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Segment Information - Net Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Net Income (Loss) Attributable to Parent | $ 597 | $ 378
Operating Segments | Commercial Lines Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net Income (Loss) Attributable to Parent | 298 | 231
Operating Segments | Personal Lines Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net Income (Loss) Attributable to Parent | 89 | 33
Operating Segments | Property & Casualty Other Operations |  |
Segment Reporting Information [Line Items] |  |
Net Income (Loss) Attributable to Parent | 17 | 24
Operating Segments | Group Benefits Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net Income (Loss) Attributable to Parent | 54 | 45
Operating Segments | Mutual Funds |  |
Segment Reporting Information [Line Items] |  |
Net Income (Loss) Attributable to Parent | 34 | 23
Corporate |  |
Segment Reporting Information [Line Items] |  |
Net Income (Loss) Attributable to Parent | $ 105 | $ 22

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