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Commitments - Undiscounted Gathering Processing and Transportation Agreements Commitments Table (Details) - Gathering and Processing Equipment [Member]
$ in Millions
Sep. 30, 2015
USD ($)
Other Commitments [Line Items]  
Gathering, Processing and Transportation Commitment, Remainder of Year $ 461
Gathering, Processing and Transportation Commitment, Due in Second Year 1,927
Gathering, Processing and Transportation Commitment, Due in Third Year 1,939
Gathering, Processing and Transportation Commitment, Due in Fourth Year 1,741
Gathering, Processing and TransportationCommitment, Due in Fifth Year 1,452
Gathering, Processing and Transportation Commitment, Due after Fifth Year 6,828
Gathering, Processing and Transportation Commitment $ 14,348