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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES, Part 2 (Details) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) Bcf MMBbls	Dec. 31, 2019 USD ($) Bcf MMBbls
Derivative [Line Items]
Realized Loss on Settled Interest Rate Swaps Recorded in AOCI | $	$ 48,300		$ 48,300
Notional Amount Of Cash Flow Hedge Instruments Settled | $		$ 750,000	$ 1,300,000
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			5.8	0
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			(45.4)	(59.0)
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			5.8	0
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			(45.4)	(59.0)
Designated as Hedging Instrument [Member] | Options | - Natural gas (Bcf) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			0	0
Designated as Hedging Instrument [Member] | Options | - Natural gas (Bcf) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			(31.5)	0
Designated as Hedging Instrument [Member] | Futures, forwards and swaps | - Crude oil and NGLs (MMBbl) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			13.8	7.9
Designated as Hedging Instrument [Member] | Futures, forwards and swaps | - Crude oil and NGLs (MMBbl) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			(22.5)	(17.4)
Designated as Hedging Instrument [Member] | Interest-rate contracts | Purchased/ Payor
Derivative [Line Items]
Derivative, Notional Amount | $	1,100,000		$ 1,100,000	$ 3,100,000
Designated as Hedging Instrument [Member] | Interest-rate contracts | Sold/ Receiver
Derivative [Line Items]
Derivative, Notional Amount | $	0		$ 0	$ 0
Not Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			1.8	0
Not Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			(1.8)	0
Not Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			1.8	0
Not Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume			(1.8)	0
LIBOR Based Interest Payments [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest-rate contracts
Derivative [Line Items]
Derivative, Notional Amount | $	0		$ 0	$ 1,300,000
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest-rate contracts
Derivative [Line Items]
Derivative, Notional Amount | $	$ 1,100,000		$ 1,100,000	$ 1,800,000
Notes Payable from Public Offering Due 2025, 2030 and 2050 [Member]
Derivative [Line Items]
Senior notes, noncurrent | $		$ 1,750,000

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