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Contingencies and Commitments - Gathering Processing and Transportation Commitments Table (Details) - Gathering, processing and transportation agreement [Member]
$ in Millions
Sep. 30, 2018
USD ($)
Other Commitments [Line Items]  
Gathering, processing and transportation commitment, 2018 $ 269
Gathering, processing and transportation commitment, 2019 1,048
Gathering, processing and transportation commitment, 2020 992
Gathering, processing and transportation commitment, 2021 900
Gathering, processing and transportation commitment, 2022 792
Gathering, processing and transportation commitment, 2023-2035 4,443
Gathering, processing and transportation commitment, total $ 8,444