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Derivative Financial Instruments (Details) bbl in Thousands, BTU in Billions | Nov. 01, 2019 BTU $ / Barrels $ / EnergyContent bbl | Sep. 30, 2019 BTU $ / Barrels $ / EnergyContent bbl
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NYMEX Oil Swap Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 1,685
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 61.38
NYMEX Oil Swap Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 7,441
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 59.64
NYMEX Oil Swap Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 9,126
NYMEX Oil Collar Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 3,168
Derivative, Weighted-Average Floor Price | $ / Barrels |  |  | 50.54
Derivative, Weighted-Average Ceiling Price | $ / Barrels |  |  | 62.49
NYMEX Oil Collar Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 6,010
Derivative, Weighted-Average Floor Price | $ / Barrels |  |  | 55.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels |  |  | 62.95
NYMEX Oil Collar Contract, Year 3 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 329
Derivative, Weighted-Average Floor Price | $ / Barrels |  |  | 55.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels |  |  | 56.70
NYMEX Oil Collar Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 9,507
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 3,338
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels | [1] |  | (2.87)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 14,090
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels | [1] |  | (0.73)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, Year 3 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 3,708
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels | [1] |  | 0.33
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, Year 4 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 0
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels | [1] |  | 0
WTI Midland NYMEX WTI [Member] | Oil Basis Swap [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 21,136
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 0
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels | [2] |  | 0
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 2,750
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels | [2] |  | (8.03)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract, Year 3 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 3,650
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels | [2] |  | (7.86)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract, Year 4 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 3,650
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price | $ / Barrels | [2] |  | (7.78)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 10,050
WAHA [Member] | Gas Swaps Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent |  |  | 1.75
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  |  | 2,962
WAHA [Member] | Gas Swaps Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent |  |  | 1.70
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  |  | 4,977
WAHA [Member] | Gas Swaps Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU | [3] |  | 7,939
IF HSC [Member] | Gas Swaps Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent |  |  | 2.88
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  |  | 14,433
IF HSC [Member] | Gas Swaps Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent |  |  | 2.87
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  |  | 11,773
IF HSC [Member] | Gas Swaps Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU | [3] |  | 26,206
IF HSC [Member] | Gas Collar Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Weighted-Average Floor Price | $ / EnergyContent |  |  | 2.50
Derivative, Weighted-Average Ceiling Price | $ / EnergyContent |  |  | 2.83
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  |  | 4,818
IF HSC [Member] | Gas Collar Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  |  | 4,818
IF WAHA [Member] |  |  |
Derivative Financial Instruments |  |  |
Index percent of natural gas fixed swaps |  |  | 56.00%
GD WAHA [Member] |  |  |
Derivative Financial Instruments |  |  |
Index percent of natural gas fixed swaps |  |  | 44.00%
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 896
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 12.36
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 711
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 11.38
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 1,607
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 660
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 31.60
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 1,187
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 23.58
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 1,847
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 39
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 35.64
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 0
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 39
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 29
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 35.70
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 0
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 29
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter of Current Fiscal Year [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 50
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 50.93
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  |  | 0
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 50
Subsequent Event [Member] | NYMEX Oil Swap Contract, Third Quarter of Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 900 |
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  | 51.61 |
Subsequent Event [Member] | IF HSC [Member] | Gas Swaps Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent |  | 2.28 |
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  | 9,725 |
Subsequent Event [Member] | IF WAHA [Member] | Gas Swaps Contract,Year 2 and Year 3 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent |  | 1.06 |
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  | 12,229 |
Subsequent Event [Member] | OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2 [Member] |  |  |
Derivative Financial Instruments |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 500 |
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels |  | 19.27 |
[1] | (1) Represents the price differential between WTI Midland (Midland, Texas) and NYMEX WTI (Cushing, Oklahoma).
[2] | (2) Represents the price differential between NYMEX WTI (Cushing, Oklahoma) and ICE Brent (North Sea).
[3] | (1) The Company has natural gas swaps in place that settle against Inside FERC Houston Ship Channel (“IF HSC”), Inside FERC West Texas (“IF WAHA”), and Platt’s Gas Daily West Texas (“GD WAHA”). As of September 30, 2019, WAHA volumes were comprised of 56 percent IF WAHA and 44 percent GD WAHA.

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