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Commitments - Gathering Processing and Transportation Commitments Table (Details) - Gathering, processing and transportation agreement [Member]
$ in Millions
Mar. 31, 2018
USD ($)
Other Commitments [Line Items]  
Gathering, processing and transportation commitment, 2018 $ 815
Gathering, processing and transportation commitment, 2019 1,052
Gathering, processing and transportation commitment, 2020 980
Gathering, processing and transportation commitment, 2021 884
Gathering, processing and transportation commitment, 2022 772
Gathering, processing and transportation commitment, 2023-2035 4,406
Gathering, processing and transportation commitment, total $ 8,909