Derivative Financial Instruments - Summary of Outstanding Oil and Gas Derivative Contracts and Weighted Average Oil and Gas Prices (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 MMBTU $ / MBbls $ / MMBTU $ / bbl MBbls	Dec. 31, 2019 USD ($) MBbls
Subject to Master Netting Agreement with Counter Party
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls		1,800
Fair value of notional MBbls excluded | $		$ 9.0
Crude Options | Put Option | Subject to Master Netting Agreement with Counter Party
Derivative [Line Items]
Fair value of notional MBbls excluded | $		$ 9.0
Crude Options | Forecast | Put Option | Subject to Master Netting Agreement with Counter Party
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	1,800
Three-way collars | Crude Options | Forecast | Put Option
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	7,800
Midland-Cushing Index | Crude Options | Forecast | Swap [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	600
Derivative, Swap Type, Fixed Price | $ / bbl	55.20
Midland-Cushing Index | Crude Options | Forecast | Basis Swap [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	900
Strike price ($/Bbl)	0.25
Houston-Cushing Index | Crude Options | Forecast | Swap [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	780
Derivative, Swap Type, Fixed Price | $ / bbl	56.30
Waha | NGLs (MBbls) | Forecast | Swap [Member]
Derivative [Line Items]
Notional (MBbl) | MMBTU	17,640,000
Strike price ($/Bbl) | $ / MMBTU	0.88
Three Way Collars, WTI Magellan East Houston | Crude Options | Forecast | Put Option
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	15,900
Three way collars, Brent | Crude Options | Forecast | Put Option
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	3,450
Long | Three-way collars | Crude Options | Forecast | Put Option
Derivative [Line Items]
Weighted average strike price (in dollars per unit)	56.00
Long | Three Way Collars, WTI Magellan East Houston | Crude Options | Forecast | Put Option
Derivative [Line Items]
Weighted average strike price (in dollars per unit)	58.55
Long | Three way collars, Brent | Crude Options | Forecast | Put Option
Derivative [Line Items]
Weighted average strike price (in dollars per unit)	62.26
Short | Three-way collars | Crude Options | Forecast | Put Option
Derivative [Line Items]
Weighted average strike price (in dollars per unit)	46.00
Short | Three-way collars | Crude Options | Forecast | Call Option
Derivative [Line Items]
Weighted average strike price (in dollars per unit)	66.92
Short | Three Way Collars, WTI Magellan East Houston | Crude Options | Forecast | Put Option
Derivative [Line Items]
Weighted average strike price (in dollars per unit)	48.55
Short | Three Way Collars, WTI Magellan East Houston | Crude Options | Forecast | Call Option
Derivative [Line Items]
Weighted average strike price (in dollars per unit)	73.24
Short | Three way collars, Brent | Crude Options | Forecast | Put Option
Derivative [Line Items]
Weighted average strike price (in dollars per unit)	52.26
Short | Three way collars, Brent | Crude Options | Forecast | Call Option
Derivative [Line Items]
Weighted average strike price (in dollars per unit)	73.48