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Commitments - Undiscounted Gathering Processing and Transportation Agreements Commitments Table (Details) - Gathering and Processing Equipment [Member]
$ in Millions
Mar. 31, 2016
USD ($)
Other Commitments [Line Items]  
Gathering, Processing and Transportation Commitment, Remainder of Year $ 1,383
Gathering, Processing and Transportation Commitment, Due in Second Year 1,880
Gathering, Processing and Transportation Commitment, Due in Third Year 1,676
Gathering, Processing and Transportation Commitment, Due in Fourth Year 1,378
Gathering, Processing and TransportationCommitment, Due in Fifth Year 1,051
Gathering, Processing and Transportation Commitment, Due after Fifth Year 6,696
Gathering, Processing and Transportation Commitment $ 14,064