Derivatives - Derivative Instruments (Details) - 2021 Settlement	Jun. 30, 2021 MMBTU MMBbls $ / Barrel
Crude Oil
Derivative [Line Items]
Derivative instrument (MMbbl and MMbtu) | MMBbls	64.4
Crude Oil | Short position
Derivative [Line Items]
Ceiling sold price (dollars per barrel)	74.16
Natural Gas
Derivative [Line Items]
Derivative instrument (MMbbl and MMbtu) | MMBTU	96.4
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