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Contingencies and Commitments - Gathering Processing and Transportation Commitments Table (Details) - Gathering, processing and transportation agreement
$ in Millions
Mar. 31, 2019
USD ($)
Other Commitments [Line Items]  
Gathering, processing and transportation commitment, 2019 $ 627
Gathering, processing and transportation commitment, 2020 783
Gathering, processing and transportation commitment, 2021 687
Gathering, processing and transportation commitment, 2022 585
Gathering, processing and transportation commitment, 2023 472
Gathering, processing and transportation commitment, 2024-2035 2,443
Gathering, processing and transportation commitment, total $ 5,597