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Acquisitions (Unaudited) Pro Forma Information (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Mar. 31, 2014 Plains Exploration & Production Company and McMoRan Exploration Co [Member] | Jun. 30, 2013 Plains Exploration & Production Company and McMoRan Exploration Co [Member] | Jun. 30, 2013 Plains Exploration & Production Company and McMoRan Exploration Co [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenues |  |  |  |  |  | $ 5,330,000,000 | $ 11,025,000,000
Business Acquisition, Pro Forma Operating Income |  |  |  |  |  | 1,330,000,000 | 2,910,000,000
Business Acquisition, Pro Forma Income from Continuing Operations |  |  |  |  |  | 722,000,000 | 1,635,000,000
Business Acquisition, Pro Forma Net Income |  |  |  |  |  | 585,000,000 | 1,313,000,000
Business Acquisition, Pro Forma Earnings Per Share, Basic |  |  |  |  |  | $ 0.56 | $ 1.26
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  |  |  |  |  | $ 0.56 | $ 1.26
Business Combination, Acquisition Related Costs, Including Acquiree Costs |  |  |  |  |  | 506,000,000 |
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances | 58,000,000 | (183,000,000) | 58,000,000 | (183,000,000) |  | (183,000,000) |
Gain on investment in MMR | 0 | 128,000,000 | 0 | 128,000,000 |  | 128,000,000 |
Gain (Loss) on Sale of Oil and Gas Property, Excluded for Full Cost Accounting |  |  |  |  | $ 77,000,000 |  |

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- Definition The pro forma operating income (loss), for the period as if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities, including costs incurred by the acquiree. + References No definition available. + Details
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- Definition Income tax expense (benefit) related to changes in deferred tax liabilities and deferred tax asset valuation allowances. + References No definition available. + Details
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- Details
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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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