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Contingencies and Commitments - Gathering, Processing and Transportation Agreements and Service Contract (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Gathering, Processing and Transportation Agreement  
Other Commitment, Fiscal Year Maturity [Abstract]  
2020 $ 1,136
2021 1,033
2022 913
2023 789
2024 690
2025 – 2034 3,479
Total 8,040
Service Contract  
Other Commitment, Fiscal Year Maturity [Abstract]  
2020 7
2021 7
2022 2
Total $ 16