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Environmental Liabilities and Expenditures (Tables) | 9 Months Ended
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Sep. 30, 2018
Environmental Remediation Obligations [Abstract] |
Schedule of current and non-current environmental remediation reserves by categories of sites |
|  | Number of Sites |  | Reserve Balance (in millions) |
NPL sites |  | 34 |  |  | $ | 453 |  |
Third-party sites |  | 69 |  |  | 172 |  |
Occidental-operated sites |  | 14 |  |  | 114 |  |
Closed or non-operated Occidental sites |  | 29 |  |  | 137 |  |
Total |  | 146 |  |  | $ | 876 |  |

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