Accounting for Suspended Exploratory Wells (Details) (USD $)	3 Months Ended
Mar. 31, 2015
Accounting for Suspended Exploratory Wells [Abstract]
Capitalized cost of exploratory wells	$ 4,300,000,000us-gaap_CapitalizedExploratoryWellCosts
Increase in capitalized cost of suspended wells from the prior year end	127,000,000
Capitalized exploratory well cost, charged to expense	$ 95,000,000

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Capitalized exploratory well costs that were expensed during the year because proved reserves were not found at the exploratory well.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 1B

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=51678428&loc=SL6806780-109447

+ Details

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Period Type:	duration

- Definition

The change during the reporting period in capitalized exploratory well costs. This change comprises additions of capitalized costs where proven reserves have not been found, reclassification of capitalized costs where proved reserves were found, and capitalized costs that were expensed when proved reserves were definitively not found.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 1B

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=51678428&loc=SL6806780-109447

+ Details

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- Definition

The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 1B

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=51678428&loc=SL6806780-109447

+ Details

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