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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) $ / bbl | Dec. 31, 2016 USD ($) $ / bbl | Dec. 31, 2015 USD ($) $ / bbl
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves |  |  |  |  | $ 4,900 |
Impairment of Oil and Gas Properties | $ 200 | $ 300 | $ 3,800 | $ 0 | 4,317 | $ 13,144
Foreign currency transaction gains (losses), before tax |  |  |  | $ (5) | 32 | (90)
Transfer to full cost pool |  |  |  |  |  | 6,400
United States oil and gas operations |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Capitalized interest |  |  |  |  | $ 7 | $ 58
Crude Oil |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Average sales price (usd per bbl) | $ / bbl |  |  |  | 51.34 | 42.75 | 50.28
Copper |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of ultimate copper recovery from leach stockpiles |  |  |  | 90.00% |  |
Percentage of copper ultimately recoverable from newly placed material on active stockpiles extracted during the first year |  |  |  | 80.00% |  |
PT-FI |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage of subsidiary |  |  |  | 90.64% |  |

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- Definition The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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