Revenue from Contracts with Customers (Current Long-Term Contracts Outstanding) (Details) Boe / d in Thousands	Mar. 31, 2020 MMcf / d Boe / d
Q4 2021 | United States
Disaggregation of Revenue [Line Items]
Approximate Volumes | Boe / d	17
Q4 2021 | Canada | Dedicated acreage delivery in GOM
Disaggregation of Revenue [Line Items]
Approximate Volumes	10
Q4 2020 | Canada | Deliveries from dedicated acreage in Eagle Ford
Disaggregation of Revenue [Line Items]
Approximate Volumes	59
Q4 2020 | Canada | Dedicated acreage delivery in GOM
Disaggregation of Revenue [Line Items]
Approximate Volumes	60
Q4 2024 | Canada | Dedicated acreage delivery in GOM
Disaggregation of Revenue [Line Items]
Approximate Volumes	30
Q4 2026 | Canada | Dedicated acreage delivery in GOM
Disaggregation of Revenue [Line Items]
Approximate Volumes	38
Q4 2026 | Canada | Dedicated acreage delivery in GOM
Disaggregation of Revenue [Line Items]
Approximate Volumes	11