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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Asset Impairments
Pretax Asset Impairment			$ 4,852	$ 3,402
Proved and unproved properties
Asset Impairments
Pretax Asset Impairment	$ 4,900	$ 3,400
Proved properties
Asset Impairments
Pretax Asset Impairment		2,700
Unproved properties
Asset Impairments
Pretax Asset Impairment	100
Recurring
Assets
Commodity derivative instruments, other current assets	87	24	87	24
Liabilities:
Commodity derivative instruments, accrued liabilities	(1)		(1)
Recurring | Level 2
Assets
Commodity derivative instruments, other current assets	87	$ 24	87	$ 24
Liabilities:
Commodity derivative instruments, accrued liabilities	$ (1)		$ (1)

X

- Definition

The pre-tax charge against earnings resulting from the write down of long lived assets due to the difference between the carrying value and lower fair value.

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- Definition

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

+ References

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=49121117&loc=d3e13433-108611

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- Definition

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.

+ References

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=49121117&loc=d3e13433-108611

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