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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 1 (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Derivative, Fair Value [Line Items]
Assets	$ 67,272,000	$ 100,124,000
(Liabilities)	(295,845,000)	(131,999,000)
Derivative, Net Liability Position, Aggregate Fair Value	0
Notional Amount Of Cash Flow Hedge Instruments Settled	1,000,000,000.0
Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	67,183,000	100,124,000
(Liabilities)	(295,845,000)	(131,999,000)
Derivatives not designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	89,000	0
(Liabilities)	0	0
Natural Gas Pipelines [Member]
Derivative, Fair Value [Line Items]
Derivative, Fair Value, Net	0	0
Other Current Assets [Member] | Commodity contracts (a) | Financial contracts | Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	62,296,000	78,891,000
(Liabilities)	(36,675,000)	(31,793,000)
Other Current Assets [Member] | Commodity contracts (a) | Financial contracts | Derivatives not designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	89,000	0
(Liabilities)	0	0
Other Current Assets [Member] | Commodity contracts (a) | Physical contracts | Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	1,074,000	1,142,000
(Liabilities)	0	0
Other Current Assets [Member] | Interest-rate contracts | Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	0	19,005,000
Other Current Liabilities | Interest-rate contracts | Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
(Liabilities)	(83,082,000)	(15,012,000)
Other Assets [Member] | Commodity contracts (a) | Financial contracts | Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	3,813,000	1,086,000
(Liabilities)	(2,230,000)	(946,000)
Other Deferred Credits | Interest-rate contracts | Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	0	0
(Liabilities)	(173,858,000)	(84,248,000)
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward Contracts [Member]
Derivative, Fair Value [Line Items]
Derivative, Notional Amount, New Contracts	500,000,000
Interest-rate contracts | Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward Contracts [Member]
Derivative, Fair Value [Line Items]
Derivative, Notional Amount	2,500,000,000	3,000,000,000.0
Interest-rate contracts | LIBOR Based Interest Payments [Member] | Cash Flow Hedging [Member] | Forward Contracts [Member]
Derivative, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,300,000,000	$ 1,300,000,000

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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
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