DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Instruments (Detail) - 3 months ended Mar. 31, 2019 bbl in Thousands, MMBTU in Thousands, £ in Millions, $ in Millions	USD ($) MMBTU Counterparty $ / MMBTU $ / bbl bbl	GBP (£) $ / MMBTU $ / bbl
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative counterparties \| Counterparty	14
Put Options \| April—September 2019 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| bbl	4,941
Weighted Average Price Differential \| $ / bbl	(8.60)	(8.60)
Put Options \| October—December 2019 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| bbl	1,380
Weighted Average Price Differential \| $ / bbl	(3.72)	(3.72)
Collars \| April—June 2019 \| Natural Gas \| NYMEX Henry Hub/Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, energy \| MMBTU	9,100
Derivative, weighted average floor price (USD per bbl)	3.00	3.00
Derivative, weighted average ceiling price (USD per bbl)	3.92	3.92
Collars \| January—December 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, weighted average floor price (USD per bbl)	1.20	1.20
Derivative, weighted average ceiling price (USD per bbl)	1.35	1.35
Derivative, notional amount \| £		£ 12.5
Basis Swap Purchased \| April—June 2019 \| Natural Gas \| NYMEX Henry Hub/Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential	(1.74)	(1.74)
Derivative, nonmonetary notional amount, energy \| MMBTU	10,920
Basis Swap Purchased \| April—June 2019 \| Natural Gas \| NYMEX Henry Hub/EP Permian
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential	0	0
Derivative, nonmonetary notional amount, energy \| MMBTU	0
Basis Swap Purchased \| April—December 2019 \| Natural Gas \| NYMEX Henry Hub/Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential	0	0
Derivative, nonmonetary notional amount, energy \| MMBTU	0
Basis Swap Sold \| April—June 2019 \| Natural Gas \| NYMEX Henry Hub/Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential	(0.53)	(0.53)
Derivative, nonmonetary notional amount, energy \| MMBTU	16,380
Basis Swap Sold \| April—June 2019 \| Natural Gas \| NYMEX Henry Hub/EP Permian
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential	(1.58)	(1.58)
Derivative, nonmonetary notional amount, energy \| MMBTU	10,920
Basis Swap Sold \| April—December 2019 \| Natural Gas \| NYMEX Henry Hub/Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential	(0.45)	(0.45)
Derivative, nonmonetary notional amount, energy \| MMBTU	11,000
Treasury lock contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount \| $	$ 400

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- Definition

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+ References

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

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Nominal energy measure used to calculate payments on a derivative instrument.

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Nominal volume used to calculate payments on a derivative instrument.

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