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Segments of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | $ 985 |  | $ 931 | $ 1,931 |  | $ 1,685
Net investment income | 404 |  | 379 | 792 |  | 740
Other income | 90 |  | 26 | 137 |  | 47
Revenues before realized gains (losses) | 1,542 |  | 1,380 | 2,979 |  | 2,572
Realized gains (losses) on securities | (1) |  | 12 | 18 |  | 31
Realized loss on subsidiaries | 0 |  | 0 | (162) |  | 0
Total revenues | 1,541 |  | 1,392 | 2,835 |  | 2,603
Property and Casualty Insurance [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net investment income | 83 |  | 76 | 162 |  | 143
Other income | 53 | [1] | 2 | 59 | [1] | 4
Revenues before realized gains (losses) | 1,121 |  | 1,009 | 2,152 |  | 1,832
Annuity [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net investment income | 306 |  | 289 | 598 |  | 564
Other income | 22 |  | 19 | 46 |  | 37
Revenues before realized gains (losses) | 328 |  | 308 | 644 |  | 601
Run-off Long-term Care and Life [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues before realized gains (losses) | 49 |  | 48 | 95 |  | 99
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues before realized gains (losses) | 44 |  | 15 | 88 |  | 40
Specialty Property and transportation [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | 327 |  | 324 | 640 |  | 625
Specialty casualty [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | 503 |  | 467 | 993 |  | 780
Specialty financial [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | 129 |  | 116 | 249 |  | 233
Specialty Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total premiums earned | $ 26 |  | $ 24 | $ 49 |  | $ 47
[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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