Revenue from Contracts with Customers - Current Long-Term Contracts Outstanding (Details) - Canada	Sep. 30, 2023 MMcf
Q4 2025 | Contracts to sell natural gas at USD index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	25
Q4, 2023 | Contracts to sell natural gas at CAD fixed prices
Disaggregation of Revenue [Line Items]
Remaining performance obligation	38
Q4 2024 | Contracts to sell natural gas at USD index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	31
Q4 2024 | Contracts to sell natural gas at CAD fixed prices
Disaggregation of Revenue [Line Items]
Remaining performance obligation	100
Q4 2024 | Contracts to sell natural gas at USD index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	15
Q4 2024 | Contracts to sell natural gas at CAD fixed prices
Disaggregation of Revenue [Line Items]
Remaining performance obligation	34
Q4 2024 | Contracts to sell natural gas at CAD fixed prices
Disaggregation of Revenue [Line Items]
Remaining performance obligation	28
Q4 2026 | Contracts to sell natural gas at USD index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	49
Q4 2027 | Contracts to sell natural gas at USD index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	20