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Commitments - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Crew
Drilling Rig Leases [Member]  
Long-term Purchase Commitment [Line Items]  
Contractual Obligation $ 144
Drilling Rig Leases [Member] | Minimum [Member]  
Long-term Purchase Commitment [Line Items]  
Lease Term 1 year
Drilling Rig Leases [Member] | Maximum [Member]  
Long-term Purchase Commitment [Line Items]  
Lease Term 3 years
Pressure Pumping Leases [Member]  
Long-term Purchase Commitment [Line Items]  
Percent of Total 50.00%
Operating Leases, Future Minimum Payments Due $ 79
Pressure Pumping Leases [Member] | Through June 30, 2017 [Member]  
Long-term Purchase Commitment [Line Items]  
Number of Crews | Crew 3