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Segments of Operations - Earnings before income taxes by segment and sub-segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings before realized gains (losses) and income taxes |  | $ 210 | $ 41 | $ 706 | $ 458
Realized gains (losses) on securities |  | 34 | (12) | (28) | (1)
Earnings before income taxes |  | 244 | 29 | 678 | 457
Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property and casualty insurance underwriting |  | 38 | (81) | 201 | 69
Investment and other income, net | [1] | 101 | 87 | 300 | 271
Earnings before realized gains (losses) and income taxes |  | 139 | 6 | 501 | 340
Annuity |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings before realized gains (losses) and income taxes |  | 117 | 102 | 341 | 283
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings before realized gains (losses) and income taxes | [2] | (46) | (67) | (136) | (165)
Specialty Property and transportation | Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property and casualty insurance underwriting |  | 0 | 6 | 56 | 70
Specialty casualty | Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property and casualty insurance underwriting |  | 49 | 2 | 119 | 46
Specialty financial | Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property and casualty insurance underwriting |  | 9 | (3) | 46 | 42
Other specialty | Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property and casualty insurance underwriting |  | (3) | 4 | (1) | 3
Other lines | Property and Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property and casualty insurance underwriting | [3] | $ (17) | $ (90) | $ (19) | $ (92)
[1] | Includes income of $13 million (before noncontrolling interest) from the sale of a hotel in the first quarter of 2017.
[2] | Includes holding company interest and expenses, including losses on retirement of debt of $4 million in the third quarter of 2017 and $7 million in the second quarter of 2017, and special charges of $9 million and $24 million in the third quarter of 2018 and 2017, respectively, to increase A&E reserves related to AFG’s former railroad and manufacturing operations.
[3] | Includes special charges of $18 million and $89 million in the third quarter of 2018 and 2017, respectively, to increase asbestos and environmental (“A&E”) reserves.

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