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Property, Plant and Equipment - Additional Information (Details) (USD $)	12 Months Ended
	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

X

- Definition

Average depreciation and depletion rate on oil and gas properties.

+ References

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+ Details

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- Definition

Expected years to complete majority of evaluation activities on unproved properties.

+ References

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- Definition

Oil and Gas Property, Cumulative Impairment based on Ceiling Test Calculation.

+ References

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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

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