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Accounting for Suspended Exploratory Well Costs	9 Months Ended
	Sep. 30, 2017
Capitalized Exploratory Well Costs [Abstract]
Accounting for Suspended Exploratory Well Costs	10. Accounting for Suspended Exploratory Well Costs For the category of exploratory well costs at year-end 2016 that were suspended more than one year, a total of $240 million was expensed in the first nine months of 2017.

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- Definition

The entire disclosure for parts or all of the information related to suspended well costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

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