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Segment Information - Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net income (loss) | $ 582 | $ (40) | $ 1,179 | $ 338
Property and Casualty, Commercial Insurance Product Line [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income (loss) | 372 | 258 | 670 | 489
Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income (loss) | 6 | 24 | 95 | 57
Property & Casualty Other Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income (loss) | 5 | 20 | 22 | 44
Group Insurance Policies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income (loss) | 96 | 69 | 150 | 114
Mutual Fund [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income (loss) | 37 | 24 | 71 | 47
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income (loss) | $ 66 | $ (435) | $ 171 | $ (413)

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