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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES, Part 2 (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) MMcf MMBbls	Dec. 31, 2018 USD ($) MMcf MMBbls
Derivative [Line Items]
Notional Amount Of Cash Flow Hedge Instruments Settled	$ 1,800,000
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMcf	0	0
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMcf	(39,600)	(29,900)
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMcf	0	0
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMcf	(39,600)	(29,900)
Designated as Hedging Instrument [Member] | Futures, forwards, swaps and options | - Crude oil and NGLs (MMBbl) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBbls	9.2	6.5
Designated as Hedging Instrument [Member] | Futures, forwards, swaps and options | - Crude oil and NGLs (MMBbl) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBbls	(20.1)	(13.8)
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Purchased/ Payor
Derivative [Line Items]
Derivative, Notional Amount	$ 3,100,000	$ 4,300,000
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Sold/ Receiver
Derivative [Line Items]
Derivative, Notional Amount	0	0
LIBOR Based Interest Payments [Member] | Cash Flow Hedging [Member] | Forward Contracts [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,300,000	1,300,000
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount, New Contracts	625,000
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward Contracts [Member] | Interest Rate Contract [Member]
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
Notes Payable from Public Offering Due 2024, 2029 and 2049 [Member]
Derivative [Line Items]
Senior Notes, Noncurrent	$ 2,000,000

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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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