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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 1 (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Net Liability Position, Aggregate Fair Value | $ 0 |
Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 67,030,000 | $ 100,124,000
(Liabilities) | (231,537,000) | (131,999,000)
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 | 64,858,000 | 78,891,000
(Liabilities) | (26,997,000) | (31,793,000)
Other Current Assets [Member] | Commodity contracts | Physical contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 0 | 1,142,000
(Liabilities) | 0 | 0
Other Current Assets [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 0 | 19,005,000
Other Current Liabilities [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
(Liabilities) | (90,161,000) | (15,012,000)
Other Assets [Member] | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 1,591,000 | 1,086,000
Other Assets [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 581,000 | 0
Other Deferred Credits | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
(Liabilities) | (2,599,000) | (946,000)
Other Deferred Credits | Interest Rate Contracts | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
(Liabilities) | (111,780,000) | (84,248,000)
Interest Rate Contracts | LIBOR Based Interest Payments [Member] | Cash Flow Hedging [Member] | Forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 1,300,000,000 | $ 1,300,000,000

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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