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Commitments - Undiscounted Gathering Processing and Transportation Agreements Commitments Table (Details) - Gathering and Processing Equipment [Member]
$ in Millions
Jun. 30, 2015
USD ($)
Other Commitments [Line Items]  
Gathering, Processing and Transportation Commitment, Remainder of Year $ 914
Gathering, Processing and Transportation Commitment, Due in Second Year 1,936
Gathering, Processing and Transportation Commitment, Due in Third Year 1,941
Gathering, Processing and Transportation Commitment, Due in Fourth Year 1,723
Gathering, Processing and TransportationCommitment, Due in Fifth Year 1,437
Gathering, Processing and Transportation Commitment, Due after Fifth Year 6,227
Gathering, Processing and Transportation Commitment $ 14,178