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Fair Value Measurement (Unaudited) Unobservable Inputs (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2014 Plains Offshore Warrants [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2014 Crude Oil Options [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2014 Crude Oil Options [Member] Minimum [Member] | Jun. 30, 2014 Crude Oil Options [Member] Minimum [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2014 Crude Oil Options [Member] Maximum [Member] | Jun. 30, 2014 Crude Oil Options [Member] Maximum [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2014 Crude Oil Options [Member] Weighted Average [Member] | Jun. 30, 2014 Crude Oil Options [Member] Weighted Average [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2014 Sales [Member] Crude Oil Options [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2014 Interest Expense [Member] Crude Oil Options [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Implied Volatilities |  |  |  |  |  |  |  |  |  |  |  | 14.00% |  | 55.00% |  | 21.00% |  |
Deferred Premium Price |  |  |  |  |  |  |  |  |  |  | 5.15 |  | 7.22 |  | 6.49 |  |  |
Derivative Liability | $ (317) | $ (320) | $ (298) | [1],[2] | $ (311) | [1] | $ (2) |  | $ (309) |  |  |  |  |  |  |  |  |
Net realized losses |  |  |  |  |  |  | 0 |  | (6) | [3] |  |  |  |  |  |  |  |
Net unrealized (losses) gains included in earnings related to assets and liabilities still held at the end of the period |  |  |  |  |  |  | 2 | [4] | (100) | [5] |  |  |  |  |  |  | (98) | (2)
Settlement payments |  |  |  |  |  |  | 0 |  | 117 |  |  |  |  |  |  |  |  |
Derivative Liability | $ (317) | $ (320) | $ (298) | [1],[2] | $ (311) | [1] | $ 0 |  | $ (298) |  |  |  |  |  |  |  |  |
[1] | Recorded at fair value.
[2] | Refer to Note 7 for further discussion and balance sheet classifications. Crude oil options are net of $329 million at June 30, 2014, and $444 million at December 31, 2013, for deferred premiums and accrued interest.
[3] | Recorded in revenues.
[4] | Recorded in other (expense) income, net.
[5] | Included net unrealized losses of $98 million recorded in revenues and $2 million of interest expense associated with the deferred premiums.

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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 liabilities 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=35750535&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=35750535&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=34720828&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=36459792&loc=SL20226008-175313 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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