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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 1 (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Assets | $ 110,498 | $ 67,030
(Liabilities) | (349,018) | (231,537)
Derivative, Net Liability Position, Aggregate Fair Value | 0 |
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 35,100 |
Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 107,461 | 67,030
(Liabilities) | (345,980) | (231,537)
Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 3,037 | 0
(Liabilities) | (3,038) | 0
Natural Gas Pipelines |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Fair Value, Net | 0 | 0
Other Current Assets [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 107,461 | 64,858
(Liabilities) | (142,573) | (26,997)
Other Current Assets [Member] | Commodity contracts | Financial contracts | Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 3,037 | 0
(Liabilities) | (3,038) | 0
Other Current Liabilities [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 0 | 0
(Liabilities) | 0 | (90,161)
Other Deferred Credits | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 0 | 1,591
(Liabilities) | 0 | (2,599)
Other Deferred Credits | Interest Rate Contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 0 | 581
(Liabilities) | $ (203,407) | (111,780)
Interest Rate Contracts | LIBOR Based Interest Payments [Member] | Cash Flow Hedging [Member] | Forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount |  | $ 1,300,000

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