Derivatives - Derivative Instruments (Details) - 2021 Settlement	Sep. 30, 2021 millionsOfMMBTU MMBbls $ / MMBTU $ / Barrel
Crude Oil
Derivative [Line Items]
Derivative instrument (MMbbl and MMbtu) | MMBbls	32.2
Crude Oil | Short position
Derivative [Line Items]
Ceiling sold price (dollars per barrel) | $ / Barrel	74.16
Natural Gas
Derivative [Line Items]
Derivative instrument (MMbbl and MMbtu) | millionsOfMMBTU	38.4
Natural Gas | Short position
Derivative [Line Items]
Ceiling sold price (dollars per barrel)	3.61
Natural Gas | Long position
Derivative [Line Items]
Purchase price (dollars per barrel)	2.50