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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent Event On August 1, 2017, we completed the sale of our enhanced oil recovery assets in the Permian Basin for total consideration of approximately $600 million. As a result of the sale, we will recognize a pre-tax gain of approximately $270 million ($270 million after income taxes) in the third quarter of 2017. These assets produced an average of 8,000 barrels of oil equivalent per day during the first six months of 2017.