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Commitments - Undiscounted Gathering Processing and Transportation Agreements Commitments Table (Details) - Gathering, Processing and Transportation Agreement [Member]
$ in Millions
Sep. 30, 2017
USD ($)
Other Commitments [Line Items]  
Gathering, Processing and Transportation Commitment, Due Remainder of Fiscal Year $ 331
Gathering, Processing and Transportation Commitment, Due in Second Year 1,096
Gathering, Processing and Transportation Commitment, Due in Third Year 1,062
Gathering, Processing and Transportation Commitment, Due in Fourth Year 990
Gathering, Processing and Transportation Commitment, Due in Fifth Year 894
Gathering, Processing and Transportation Commitment, Due after Fifth Year 5,214
Gathering, Processing and Transportation Commitment $ 9,587