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Segment Information - Net Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Net income | $ 630 | $ 597
Dividends declared on preferred stock | 5 | 0
Net Income (Loss) Available to Common Stockholders, Basic | 625 | 597
Corporate |  |
Segment Reporting Information [Line Items] |  |
Net income | 0 | 105
Property and Casualty, Commercial Insurance Product Line [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income | 363 | 298
Property and Casualty, Personal Insurance Product Line [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income | 96 | 89
Property & Casualty Other Operations |  |
Segment Reporting Information [Line Items] |  |
Net income | 23 | 17
Group Insurance Policies [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income | 118 | 54
Mutual Fund [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income | $ 30 | $ 34

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