FAIR VALUE MEASUREMENTS (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Level 2
Assets
Commodity derivative instruments, other current assets	$ 66	$ 24
Liabilities:
Commodity derivative instruments, accrued liabilities	4
Total Fair Value
Assets
Commodity derivative instruments, other current assets	66	$ 24
Liabilities:
Commodity derivative instruments, accrued liabilities	$ 4

Fair value as of the balance sheet date of price risk derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities on the balance sheet.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant