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Segments of Operations (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Total premiums earned |  | $ 998 | $ 946
Net investment income |  | 411 | 388
Other income |  | 46 | 50
Revenues before realized gains (losses) |  | 1,493 | 1,440
Realized gains (losses) on securities |  | (18) | 19
Realized losses on subsidiaries |  | 0 | (162)
Total revenues |  | 1,475 | 1,297
Property and Casualty Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income |  | 83 | 79
Other income |  | 3 | 6
Revenues before realized gains (losses) |  | 1,084 | 1,031
Annuity [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income |  | 315 | 292
Other income |  | 26 | 27
Revenues before realized gains (losses) |  | 341 | 319
Run-off Long-term Care and Life [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before realized gains (losses) | [1] | 12 | 46
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before realized gains (losses) |  | 56 | 44
Specialty Property and transportation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total premiums earned |  | 339 | 313
Specialty casualty [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total premiums earned |  | 502 | 490
Specialty financial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total premiums earned |  | 132 | 120
Specialty Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total premiums earned |  | $ 25 | $ 23
[1] | AFG sold substantially all of its run-off long-term care insurance business in December 2015

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