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Segment Information - Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net income | $ 432 | $ 234 | $ 1,611 | $ 572
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | (35) | 21 | 136 | (392)
Property and Casualty, Commercial Insurance Product Line [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | 289 | 90 | 959 | 579
Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | 51 | 8 | 146 | 65
Property & Casualty Other Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | 9 | 18 | 31 | 62
Group Insurance Policies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | 77 | 71 | 227 | 185
Mutual Fund [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | $ 41 | $ 26 | $ 112 | $ 73

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