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Accounting for Suspended Exploratory Wells	6 Months Ended
Accounting for Suspended Exploratory Wells	Jun. 30, 2014
Accounting for Suspended Exploratory Wells [Abstract]
Accounting for Suspended Exploratory Wells	Accounting for Suspended Exploratory Wells The capitalized cost of suspended wells at June 30, 2014, was $3.9 billion, a net increase of $656 million from year-end 2013, primarily due to drilling activities.