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Commitments - Undiscounted Gathering Processing and Transportation Agreements Commitments Table (Details) - Gas Gathering and Processing Equipment [Member]
$ in Millions
Mar. 31, 2017
USD ($)
Other Commitments [Line Items]  
Gathering, Processing and Transportation Commitment, Due Remainder of Fiscal Year $ 977
Gathering, Processing and Transportation Commitment, Due in Second Year 1,102
Gathering, Processing and Transportation Commitment, Due in Third Year 1,067
Gathering, Processing and Transportation Commitment, Due in Fourth Year 989
Gathering, Processing and Transportation Commitment, Due in Fifth Year 894
Gathering, Processing and Transportation Commitment, Due after Fifth Year 5,212
Gathering, Processing and Transportation Commitment $ 10,241