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FAIR VALUE MEASUREMENT FAIR VALUE MEASUREMENT (Unobservable inputs) (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Deferred Option Premiums and Accrued Interest [Member] | Dec. 31, 2013 Crude Oil Options [Member] Minimum [Member] | Dec. 31, 2013 Crude Oil Options [Member] Maximum [Member] | Dec. 31, 2013 Crude Oil Options [Member] Weighted Average [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Crude Oil Options [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Crude Oil Options [Member] Fair Value, Inputs, Level 3 [Member] Sales [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Crude Oil Options [Member] Fair Value, Inputs, Level 3 [Member] Interest Expense [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Crude Oil Options [Member] Fair Value, Inputs, Level 3 [Member] Minimum [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Crude Oil Options [Member] Fair Value, Inputs, Level 3 [Member] Maximum [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Crude Oil Options [Member] Fair Value, Inputs, Level 3 [Member] Weighted Average [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Warrant [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Implied Volatility Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.00% | 45.00% | 23.00% |  |
Deferred Premium Price |  |  |  | 5.15 | 7.22 | 6.33 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability | $ 320 | $ 20 | $ 444 |  |  |  | $ 311 | [1] | $ 0 | [1],[2] | $ 0 |  |  |  |  |  |  | $ 0 |
Derivative financial instruments assumed in the PXP acquisition |  |  |  |  |  |  |  |  |  |  | (83) |  |  |  |  |  |  | (10) |
Net realized losses |  |  |  |  |  |  |  |  |  |  | (38) | [3] | 37 | 1 |  |  |  | 0 |
Net unrealized (losses) gains included in earnings related to assets and liabilities still held at the end of the period |  |  |  |  |  |  |  |  |  |  | (230) | [4] | 228 | 2 |  |  |  | 8 | [5]
Settlement payments |  |  |  |  |  |  |  |  |  |  | 42 |  |  |  |  |  |  | 0 |
Derivative Liability | $ 320 | $ 20 | $ 444 |  |  |  | $ 311 | [1] | $ 0 | [1],[2] | $ (309) |  |  |  |  |  |  | $ (2) |
[1] | Recorded at fair value.
[2] | rude oil options are net of $444 million for deferred premiums and accrued interest.
[3] | Included net realized losses of $37 million recorded in revenues and $1 million of interest expense associated with the deferred premiums for the seven month period from June 1, 2013, to December 31, 2013.
[4] | Included unrealized losses of $228 million recorded in revenues and $2 million of interest expense associated with the deferred premiums.
[5] | Recorded in other (expense) income, net.

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- Definition Amount of assumed financial instruments into level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + 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=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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