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%