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Subsequent Events (Notes)
3 Months Ended
Mar. 31, 2016
Subsequent Events [Abstract]  
Subsequent Events [Text Block]
Subsequent Event
In September 2015, we announced our intention to scale back our conventional exploration program, with future exploration investment focused on fulfilling our existing commitments in the Gulf of Mexico and Gabon. In April 2016, we made the decision not to drill any of our remaining Gulf of Mexico undeveloped leases. As a result, we expect to record a non-cash impairment between $140 million and $150 million in the second quarter of 2016. We retain our existing deepwater drilling rig commitment, in which we have approximately 200 days of contract term remaining.