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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 1 (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Derivative, Fair Value [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	$ 0
Notional Amount Of Cash Flow Hedge Instruments Settled	1,800,000,000
Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	80,895,000	$ 100,124,000
(Liabilities)	(317,278,000)	(131,999,000)
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	72,995,000	78,891,000
(Liabilities)	(36,186,000)	(31,793,000)
Other Current Assets [Member] | Commodity contracts (a) | Physical contracts | Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	579,000	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)	(14,672,000)	(15,012,000)
Other Assets [Member] | Commodity contracts (a) | Financial contracts | Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	7,321,000	1,086,000
(Liabilities)	(4,227,000)	(946,000)
Other Deferred Credits | Interest-rate contracts | Derivatives designated as hedging instruments
Derivative, Fair Value [Line Items]
Assets	0	0
(Liabilities)	(262,193,000)	(84,248,000)
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward Contracts [Member]
Derivative, Fair Value [Line Items]
Derivative, Notional Amount, New Contracts	625,000,000
Interest-rate contracts | Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward Contracts [Member]
Derivative, Fair Value [Line Items]
Derivative, Notional Amount	1,800,000,000	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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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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