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Contingencies and Commitments - Gathering Processing and Transportation Commitments Table (Details) - Gathering, processing and transportation agreement [Member]
$ in Millions
Jun. 30, 2018
USD ($)
Other Commitments [Line Items]  
Gathering, processing and transportation commitment, 2018 $ 537
Gathering, processing and transportation commitment, 2019 1,047
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 4,434
Gathering, processing and transportation commitment, total $ 8,702