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Commitments - Undiscounted Gathering Processing and Transportation Agreements Commitments Table (Details) - Gathering and Processing Equipment [Member]
$ in Millions
Sep. 30, 2016
USD ($)
Other Commitments [Line Items]  
Gathering, Processing and Transportation Commitment, Remainder of Year $ 465
Gathering, Processing and Transportation Commitment, Due in Second Year 1,872
Gathering, Processing and Transportation Commitment, Due in Third Year 1,667
Gathering, Processing and Transportation Commitment, Due in Fourth Year 1,382
Gathering, Processing and Transportation Commitment, Due in Fifth Year 1,052
Gathering, Processing and Transportation Commitment, Due after Fifth Year 6,590
Gathering, Processing and Transportation Commitment $ 13,028