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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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Oil And Gas Property Unevaluated Property Costs Transferred To Full Cost Pool.

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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.

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-Publisher SEC
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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.

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Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found.

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