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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 2 (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) MMcf MMBbls	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) MMcf MMBbls
Derivative [Line Items]
Notional Amount Of Cash Flow Hedge Instruments Settled	$ 1,800,000
Derivatives designated as hedging instruments | Futures and swaps | Natural gas (Bcf) | Fixed price | Purchased/Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMcf	0			0
Derivatives designated as hedging instruments | Futures and swaps | Natural gas (Bcf) | Fixed price | Sold/Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMcf	(59,000.0)			(29,900)
Derivatives designated as hedging instruments | Futures and swaps | Natural gas (Bcf) | Basis | Purchased/Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMcf	0			0
Derivatives designated as hedging instruments | Futures and swaps | Natural gas (Bcf) | Basis | Sold/Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMcf	(59,000.0)			(29,900)
Derivatives designated as hedging instruments | Futures, forwards and swaps | Crude oils and NGLs (MMBbl) | Fixed price | Purchased/Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBbls	7.9			6.5
Derivatives designated as hedging instruments | Futures, forwards and swaps | Crude oils and NGLs (MMBbl) | Fixed price | Sold/Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBbls	(17.4)			(13.8)
Derivatives designated as hedging instruments | Interest Rate Contracts | Purchased/Payor
Derivative [Line Items]
Derivative, Notional Amount	$ 3,100,000			$ 4,300,000
Derivatives designated as hedging instruments | Interest Rate Contracts | Sold/Receiver
Derivative [Line Items]
Derivative, Notional Amount	0			0
LIBOR Based Interest Payments [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest Rate Contracts
Derivative [Line Items]
Derivative, Notional Amount	1,300,000			1,300,000
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward contracts
Derivative [Line Items]
Derivative, Notional Amount, New Contracts	625,000
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest Rate Contracts
Derivative [Line Items]
Derivative, Notional Amount	1,800,000			$ 3,000,000
Notes Payable from Public Offering Due 2029 and 2048 [Member]
Derivative [Line Items]
Senior Notes, Noncurrent	1,250,000		$ 1,250,000
Notes Payable from Public Offering Due 2024, 2029 and 2049 [Member]
Derivative [Line Items]
Senior Notes, Noncurrent	$ 2,000,000	$ 2,000,000

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Aggregate notional amount specified by the derivative(s) of new contracts entered into during the period. Expressed as an absolute value.

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Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
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