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LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES - LEGAL MATTERS (Details) - Arbitration Demand Filed By Andes Petroleum Ecuador Ltd - USD ($) $ in Billions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Long-term Purchase Commitment [Line Items] |  |
Proceeds from settlement |  | $ 1.0
Recovery of amount awarded in settlement amount (as a percent) |  | 60.00%
Claim to a settlement amount (as a percent) | 40.00% |
Own economic interest (as a percent) | 60.00% |

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