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Segments of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | $ 1,173 |  | $ 1,132 | $ 3,104 |  | $ 2,817
Net investment income | 425 |  | 377 | 1,217 |  | 1,117
Other income | 40 |  | 28 | 177 |  | 75
Revenues before realized gains (losses) | 1,695 |  | 1,568 | 4,674 |  | 4,140
Realized gains (losses) on securities | (16) |  | 13 | 2 |  | 44
Realized gain (loss) on subsidiaries | 5 |  | 0 | (157) |  | 0
Total revenues | 1,684 |  | 1,581 | 4,519 |  | 4,184
Property and Casualty Insurance [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net investment income | 83 |  | 76 | 245 |  | 219
Other income | 2 | [1] | 4 | 61 | [1] | 8
Revenues before realized gains (losses) | 1,258 |  | 1,212 | 3,410 |  | 3,044
Annuity [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net investment income | 317 |  | 287 | 915 |  | 851
Other income | 22 |  | 20 | 68 |  | 57
Revenues before realized gains (losses) | 339 |  | 307 | 983 |  | 908
Run-off Long-term Care and Life [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues before realized gains (losses) | 49 |  | 48 | 144 |  | 147
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues before realized gains (losses) | 49 |  | 1 | 137 |  | 41
Specialty Property and transportation [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | 517 |  | 504 | 1,157 |  | 1,129
Specialty casualty [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | 503 |  | 486 | 1,496 |  | 1,266
Specialty financial [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | 131 |  | 115 | 380 |  | 348
Specialty Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | $ 22 |  | $ 27 | $ 71 |  | $ 74
[1] | Includes pretax income of $51 million (before noncontrolling interest) from the sale of the Le Pavillon Hotel in the second quarter of 2015.

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