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Segments of Operations - Revenues by segment and sub-segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Total premiums earned |  | $ 1,159 | $ 1,173 | $ 3,184 | $ 3,104
Net investment income |  | 433 | 425 | 1,267 | 1,217
Other income |  | 46 | 43 | 172 | 185
Revenues before realized gains (losses) |  | 1,703 | 1,698 | 4,791 | 4,682
Realized gains (losses) on securities |  | 2 | (16) | (32) | 2
Realized gains (losses) on subsidiaries |  | 0 | 5 | 2 | (157)
Total revenues |  | 1,705 | 1,687 | 4,761 | 4,527
Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total premiums earned |  | 1,159 | 1,173 | 3,184 | 3,104
Net investment income |  | 93 | 83 | 265 | 245
Other income | [1] | 3 | 2 | 46 | 61
Revenues before realized gains (losses) |  | 1,255 | 1,258 | 3,495 | 3,410
Annuity |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net investment income |  | 351 | 317 | 1,010 | 915
Other income |  | 26 | 24 | 76 | 75
Revenues before realized gains (losses) |  | 377 | 341 | 1,086 | 990
Run-off Long-term Care and Life |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues before realized gains (losses) | [2] | 13 | 50 | 37 | 145
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues before realized gains (losses) |  | 58 | 49 | 173 | 137
Specialty Property and transportation | Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total premiums earned |  | 493 | 517 | 1,197 | 1,157
Specialty casualty | Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total premiums earned |  | 497 | 503 | 1,496 | 1,496
Specialty financial | Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total premiums earned |  | 145 | 131 | 416 | 380
Other specialty | Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total premiums earned |  | $ 24 | $ 22 | $ 75 | $ 71
[1] | Includes pretax income of $32 million (before noncontrolling interest) from the sale of an apartment property in the second quarter of 2016 and $51 million (before noncontrolling interest) from the sale of the Le Pavillon Hotel in the second quarter of 2015.
[2] | AFG sold substantially all of its run-off long-term care insurance business in December 2015.

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