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Commitments - Undiscounted Gathering Processing and Transportation Agreements Commitments Table (Details) - Gas Gathering and Processing Equipment [Member]
$ in Millions
Dec. 31, 2016
USD ($)
Other Commitments [Line Items]  
Gathering, Processing and Transportation Commitment, Due in First Year $ 1,434
Gathering, Processing and Transportation Commitment, Due in Second Year 1,229
Gathering, Processing and Transportation Commitment, Due in Third Year 1,178
Gathering, Processing and Transportation Commitment, Due in Fourth Year 1,074
Gathering, Processing and Transportation Commitment, Due in Fifth Year 970
Gathering, Processing and Transportation Commitment, Due after Fifth Year 5,225
Gathering, Processing and Transportation Commitment $ 11,110