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Derivative Financial Instruments (Details) bbl in Thousands, BTU in Billions	Feb. 17, 2021 BTU $ / Barrels $ / EnergyContent bbl	Dec. 31, 2020 BTU $ / Barrels $ / EnergyContent bbl
NYMEX Oil Swap Contract First Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,613
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		42.91
NYMEX Oil Swap Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		5,072
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		39.90
NYMEX Oil Swap Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		4,862
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		40.10
NYMEX Oil Swap Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		4,744
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		39.85
NYMEX Oil Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		6,601
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		43.99
NYMEX Oil Swap Contract, 2023 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,190
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		45.20
NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		26,082
NYMEX Oil Collar Contract First Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		551
Derivative, Floor Price \| $ / Barrels		48.97
Derivative, Ceiling Price \| $ / Barrels		51.96
NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		551
NYMEX Oil Roll Differential Swap Contract First Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,367
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price \| $ / Barrels		(0.30)
NYMEX Oil Roll Differential Swap Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		4,065
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price \| $ / Barrels		(0.24)
NYMEX Oil Roll Differential Swap Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,708
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price \| $ / Barrels		(0.25)
NYMEX Oil Roll Differential Swap Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,283
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price \| $ / Barrels		(0.24)
NYMEX Oil Roll Differential Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		6,002
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price \| $ / Barrels		(0.04)
NYMEX Oil Roll Differential Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		20,425
WTI Midland NYMEX WTI [Member] \| Oil Basis Swap Contract First Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,223
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels		0.79
WTI Midland NYMEX WTI [Member] \| Oil Basis Swap Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,385
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels		0.78
WTI Midland NYMEX WTI [Member] \| Oil Basis Swap Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		3,574
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels		0.74
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, 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, Weighted-Average Contract Price \| $ / Barrels		1.15
WTI Midland NYMEX WTI [Member] \| Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		23,506
NYMEX WTI ICE Brent [Member] \| Oil Basis Swap Contract First Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		900
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels		(7.86)
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, 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, 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, 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, Weighted-Average Contract Price \| $ / Barrels		(7.78)
NYMEX WTI ICE Brent [Member] \| Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		7,300
WTI Houston MEH NYMEX WTI [Member] \| Oil Basis Swap Contract First Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		173
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels		0.60
WTI Houston MEH NYMEX WTI [Member] \| Oil Basis Swap Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		493
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels		0.60
WTI Houston MEH NYMEX WTI [Member] \| Oil Basis Swap Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		356
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels		0.60
WTI Houston MEH NYMEX WTI [Member] \| Oil Basis Swap Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		466
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels		0.60
WTI Houston MEH NYMEX WTI [Member] \| Oil Basis Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		0
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels		0
WTI Houston MEH NYMEX WTI [Member] \| Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		1,488
IF HSC [Member] \| Gas Swaps Contract First Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure \| BTU		11,592
Derivative, Swap Type, Average Fixed Price \| $ / EnergyContent		2.48
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, Average Fixed 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, Average Fixed 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, Average Fixed Price \| $ / EnergyContent		2.41
IF HSC [Member] \| Gas Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure \| BTU		21,119
Derivative, Swap Type, Average Fixed Price \| $ / EnergyContent		2.48
IF HSC [Member] \| Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure \| BTU		71,370
WAHA [Member] \| Gas Swaps Contract First Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure \| BTU		6,544
Derivative, Swap Type, Average Fixed Price \| $ / EnergyContent		1.76
WAHA [Member] \| Gas Swaps Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure \| BTU		7,230
Derivative, Swap Type, Average Fixed 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, Average Fixed 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, Average Fixed Price \| $ / EnergyContent		1.82
WAHA [Member] \| Gas Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure \| BTU		10,066
Derivative, Swap Type, Average Fixed Price \| $ / EnergyContent		2.30
WAHA [Member] \| Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure \| BTU		39,553
IF WAHA [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps		59.00%
GD Waha [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps		41.00%
OPIS Propane Mont Belvieu Non-TET [Member] \| NGL Swaps Contract First Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		614
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		21.58
OPIS Propane Mont Belvieu Non-TET [Member] \| NGL Swaps Contract Second Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		707
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		21.26
OPIS Propane Mont Belvieu Non-TET [Member] \| NGL Swaps Contract Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		735
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		21.26
OPIS Propane Mont Belvieu Non-TET [Member] \| NGL Swaps Contract Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		714
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		21.30
OPIS Propane Mont Belvieu Non-TET [Member] \| NGL Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		116
Derivative, Swap Type, Average Fixed Price \| $ / Barrels		21.21
OPIS Propane Mont Belvieu Non-TET [Member] \| NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume		2,886
Subsequent Event [Member] \| NYMEX Oil Swap Contract, First Quarter to Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	1,048
Derivative, Swap Type, Average Fixed Price \| $ / Barrels	51.91
Subsequent Event [Member] \| NYMEX Oil Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	1,222
Derivative, Swap Type, Average Fixed Price \| $ / Barrels	48.50
Subsequent Event [Member] \| NYMEX Oil Collar Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	1,095
Derivative, Floor Price \| $ / Barrels	50.00
Derivative, Ceiling Price \| $ / Barrels	53.28
Subsequent Event [Member] \| NYMEX Oil Roll Differential Swap Contract, First Quarter to Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	2,213
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price \| $ / Barrels	0.30
Subsequent Event [Member] \| NYMEX Oil Roll Differential Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	5,276
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price \| $ / Barrels	0.27
Subsequent Event [Member] \| WTI Midland NYMEX WTI [Member] \| Oil Basis Swap Contract, First Quarter to Third Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	1,095
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels	0.95
Subsequent Event [Member] \| WTI Houston MEH NYMEX WTI [Member] \| Oil Basis Swap Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	1,329
Derivative, Oil Basis Swap, Weighted-Average Contract Price \| $ / Barrels	1.25
Subsequent Event [Member] \| IF HSC [Member] \| Gas Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure \| BTU	7,813
Derivative, Swap Type, Average Fixed Price \| $ / EnergyContent	2.64
Subsequent Event [Member] \| IF WAHA [Member] \| Gas Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure \| BTU	3,650
Derivative, Swap Type, Average Fixed Price \| $ / EnergyContent	2.30
Subsequent Event [Member] \| OPIS Propane Mont Belvieu Non-TET [Member] \| NGL Swaps Contract First Quarter to Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	440
Derivative, Swap Type, Average Fixed Price \| $ / Barrels	27.72
Subsequent Event [Member] \| OPIS Propane Mont Belvieu Non-TET [Member] \| NGL Swaps Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	115
Derivative, Swap Type, Average Fixed Price \| $ / Barrels	24.78
Subsequent Event [Member] \| OPIS Propane Mont Belvieu Non-TET [Member] \| NGL Collar Contract, 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	234
Derivative, Floor Price \| $ / Barrels	22.05
Derivative, Ceiling Price \| $ / Barrels	27.30
Subsequent Event [Member] \| OPIS Normal Butane Mont Belvieu Non-TET [Member] \| NGL Swaps Contract First Quarter to Fourth Quarter, 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume	143
Derivative, Swap Type, Average Fixed Price \| $ / Barrels	30.87