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Segments of Operations - Earnings before income taxes by segment and sub-segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Earnings before realized gains (losses) and income taxes |  | $ 719 | $ 766 | $ 745
Realized gains (losses) on securities |  | 5 | 19 | (19)
Realized gains (losses) on subsidiaries |  | 0 | 2 | (161)
Earnings before income taxes |  | 724 | 787 | 565
Property and casualty insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting |  | 242 | 236 | 225
Investment and other income, net | [1] | 349 | 341 | 351
Earnings before realized gains (losses) and income taxes |  | 591 | 577 | 576
Annuity |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings before realized gains (losses) and income taxes |  | 380 | 368 | 331
Run-off long-term care and life |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings before realized gains (losses) and income taxes | [2] | 6 | 2 | 14
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings before realized gains (losses) and income taxes | [3] | (258) | (181) | (176)
Property and transportation | Property and casualty insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting |  | 154 | 166 | 48
Specialty casualty | Property and casualty insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting |  | 104 | 78 | 146
Specialty financial | Property and casualty insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting |  | 61 | 84 | 87
Other specialty | Property and casualty insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting |  | (2) | 9 | 14
Other lines | Property and casualty insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting | [4] | $ (75) | $ (101) | $ (70)
[1] | Includes income of $32 million (before noncontrolling interest) from the sale of an apartment property in 2016 and $66 million (before noncontrolling interest) from the sales of a hotel and an apartment property in 2015.
[2] | AFG sold substantially all of its run-off long-term care insurance business in December 2015.
[3] | Primarily holding company interest and expenses, including losses on retirement of debt of $51 million in 2017 and $4 million in 2015, and special charges to increase A&E reserves related to AFG’s former railroad and manufacturing operations ($24 million in 2017, $5 million in 2016 and $12 million in 2015).
[4] | Includes special charges to increase asbestos and environmental (“A&E”) reserves of $89 million, $36 million and $67 million in 2017, 2016 and 2015, respectively. Also includes $18 million in favorable development related to the Neon exited lines recorded in connection with a reinsurance to close transaction in 2017 and a charge of $65 million related to Neon exited lines in 2016.

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