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Segment Information - Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net income | $ 535 | $ 432 | $ 1,537 | $ 1,611
Dividends declared on preferred stock | 11 | 0 | 16 | 0
Net income available to common stockholders | 524 | 432 | 1,521 | 1,611
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | (99) | (35) | (142) | 136
Property and Casualty, Commercial Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | 336 | 289 | 890 | 959
Property and Casualty, Personal Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | 94 | 51 | 252 | 146
Property & Casualty Other Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | 18 | 9 | 52 | 31
Group Insurance Policy [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | 146 | 77 | 377 | 227
Mutual Fund [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income | $ 40 | $ 41 | $ 108 | $ 112

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