Derivative Financial Instruments (Details) bbl in Thousands, BTU in Billions	Apr. 29, 2021 $ / Barrels bbl	Mar. 31, 2021 BTU $ / Barrels $ / EnergyContent bbl
NYMEX Oil Swap Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		5,508
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		40.88
NYMEX Oil Swap Contract Third Quarter, 2021
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		5,363
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		41.16
NYMEX Oil Swap Contract Fourth Quarter, 2021
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		4,744
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		39.85
NYMEX Oil Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		7,823
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		44.69
NYMEX Oil Swap Contract, 2023
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,190
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		45.20
NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		24,628
NYMEX Oil Collar Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,224
Derivative, Weighted-Average Floor Price | $ / Barrels		50.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels		54.89
NYMEX Oil Calendar Month Average Roll Differential Second Quarter, 2021
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		4,743
Derivative, Roll Differential Swap Type, Weighted-Average Contract Price | $ / Barrels		(0.16)
NYMEX Oil Calendar Month Average Roll Differential Contract Third Quarter, 2021
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		4,326
Derivative, Roll Differential Swap Type, Weighted-Average Contract Price | $ / Barrels		(0.18)
NYMEX Oil Calendar Month Average Roll Differential Fourth Quarter, 2021
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,831
Derivative, Roll Differential Swap Type, Weighted-Average Contract Price | $ / Barrels		(0.16)
NYMEX Oil Calendar Month Average Roll Differential Contract, 2022
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		11,278
Derivative, Roll Differential Swap Type, Weighted-Average Contract Price | $ / Barrels		0.11
NYMEX Oil Calendar Month Average Roll Differential Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		24,178
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		4,172
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		0.81
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,756
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		0.75
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,824
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		0.71
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		9,500
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		1.15
WTI Midland NYMEX WTI [Member] | Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		21,252
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		910
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		(7.86)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		920
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		(7.86)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		920
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		(7.86)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,650
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		(7.78)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		6,400
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		493
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		0.60
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		356
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		0.60
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		466
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		0.60
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,329
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels		1.25
WTI Houston MEH NYMEX WTI | Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		2,644
IF HSC [Member] | Gas Swaps Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		13,672
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		2.45
IF HSC [Member] | Gas Swaps Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		12,575
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		2.40
IF HSC [Member] | Gas Swaps Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		12,412
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		2.41
IF HSC [Member] | Gas Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		28,932
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		2.52
IF HSC [Member] | Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		67,591
WAHA [Member] | Gas Swaps Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		7,230
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		1.76
WAHA [Member] | Gas Swaps Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		8,086
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		1.88
WAHA [Member] | Gas Swaps Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		7,627
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		1.82
WAHA [Member] | Gas Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		13,716
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		2.30
WAHA [Member] | Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		36,659
IF WAHA [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps		65.00%
GD WAHA [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps		35.00%
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		818
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		22.14
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		854
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		22.16
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		824
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		22.15
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		231
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		22.99
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		2,727
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Collar Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		234
Derivative, Weighted-Average Floor Price | $ / Barrels		22.05
Derivative, Weighted-Average Ceiling Price | $ / Barrels		27.30
OPIS Normal Butane Mont Belvieu | NGL Swaps Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		37
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		30.87
OPIS Normal Butane Mont Belvieu | NGL Swaps Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		37
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		30.87
OPIS Normal Butane Mont Belvieu | NGL Swaps Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		36
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		30.87
OPIS Normal Butane Mont Belvieu | NGL Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		0
OPIS Normal Butane Mont Belvieu | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		110
Subsequent Event [Member] | NYMEX Oil Collar Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	180
Derivative, Weighted-Average Floor Price | $ / Barrels	50.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels	65.00