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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 ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) $ / bbl | Dec. 31, 2015 USD ($) $ / bbl | Dec. 31, 2014 USD ($) $ / bbl
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of Oil and Gas Properties | $ 239 | $ 291 | $ 3,800 | $ 3,700 | $ 3,700 | $ 2,700 | $ 3,100 | $ 4,317 | $ 13,144 | $ 3,737
Foreign currency transaction gains (losses), before tax |  |  |  |  |  |  |  | 32 | (90) | (2)
Transfer to full cost pool |  |  |  |  |  |  |  |  | 6,400 | 2,500
United States oil and gas operations |  |  |  |  |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  |  |  | $ 7 | $ 58 | $ 88
Crude Oil |  |  |  |  |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Average sales price (usd per bbl) | $ / bbl |  |  |  |  |  |  |  | 42.75 | 50.28 | 94.99
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 percentage of recoverable copper material in active copper leach stockpiles. Ultimate recoveries can vary (exceeding the stated percentage) based on the type of copper recovery, mineralogy and particle size of the rock. + References No definition available. + Details
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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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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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