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Commitments - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2011
USD ($)
Mar. 31, 2016
USD ($)
a
well
Crew
Long-term Purchase Commitment [Line Items]    
Gathering Fee Escalation Rate   15.00%
Noncontrolling Interest, Chesapeake Granite Wash Trust [Member]    
Long-term Purchase Commitment [Line Items]    
Productive Oil Wells, Number of Wells, Gross | well   69
Development Wells Drilled, Net Productive | well   106
Number Of Gross Acres | a   45,400
Number Of Net Acres | a   29,000
Maximum Amount Recoverable By Trust Under Lien | $ $ 263 $ 27
Noncontrolling Interest, Chesapeake Granite Wash Trust [Member] | Wells, Initial Number of Wells [Member]    
Long-term Purchase Commitment [Line Items]    
Development Wells Drilled, Net Productive | well   118
Minimum [Member] | Noncontrolling Interest, Chesapeake Granite Wash Trust [Member]    
Long-term Purchase Commitment [Line Items]    
Percentage Of Proceeds From Royalty Interest Conveyed To Trust   50.00%
Maximum [Member] | Noncontrolling Interest, Chesapeake Granite Wash Trust [Member]    
Long-term Purchase Commitment [Line Items]    
Percentage Of Proceeds From Royalty Interest Conveyed To Trust   90.00%
Drilling Rig Leases [Member]    
Long-term Purchase Commitment [Line Items]    
Contractual Obligation | $   $ 218
Drilling Rig Leases [Member] | Minimum [Member]    
Long-term Purchase Commitment [Line Items]    
Lease Term   3 months
Drilling Rig Leases [Member] | Maximum [Member]    
Long-term Purchase Commitment [Line Items]    
Lease Term   3 years
Pressure Pumping Leases [Member] | Seven Seven Energy Inc. [Member]    
Long-term Purchase Commitment [Line Items]    
Percent of Total   50.00%
Operating Leases, Future Minimum Payments Due | $   $ 161
Pressure Pumping Leases [Member] | Seven Seven Energy Inc. [Member] | Pressure Pumping Crew Agreement Through June 30, 2016 [Member]    
Long-term Purchase Commitment [Line Items]    
Number of Crews | Crew   5
Pressure Pumping Leases [Member] | Seven Seven Energy Inc. [Member] | Pressure Pumping Crew Agreement Through June 30, 2017 [Member]    
Long-term Purchase Commitment [Line Items]    
Number of Crews | Crew   3