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Property, Plant and Equipment - Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Property, Plant and Equipment [Abstract] |  |  |
Cumulative full cost ceiling limitation impairment charges | $ 3,500,000,000 | $ 3,500,000,000 |
Full cost ceiling impairments | $ 0 | $ 0 | $ 0
Average depreciation and depletion rate (per Boe) | 16.81 | 16.93 | 13.57
Expected completion of evaluation activities on majority of unproved properties | 10 years |  |

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- Definition Average depreciation and depletion rate on oil and gas properties. + References No definition available. + Details
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- Definition Expected years to complete majority of evaluation activities on unproved properties. + References No definition available. + Details
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- Definition Oil and Gas Property, Cumulative Impairment based on Ceiling Test Calculation. + References No definition available. + Details
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- Details
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- Definition The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 4(ii) -Article 4 + Details
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