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Segment Information - Net Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Net income | $ 273 | $ 630
Dividends declared on preferred stock | 5 | 5
Net income available to common stockholders | 268 | 625
Corporate |  |
Segment Reporting Information [Line Items] |  |
Net income | (91) | 0
Property and Casualty, Commercial Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income | 121 | 363
Property and Casualty, Personal Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income | 98 | 96
Property & Casualty Other Operations |  |
Segment Reporting Information [Line Items] |  |
Net income | 5 | 23
Group Insurance Policy [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income | 104 | 118
Mutual Fund [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income | $ 36 | $ 30

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