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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Entity [Line Items] |  |  |
Contract Liabilities, Contract Term | 5 to 10 years. |  |
Number Of Years Of Service Employees Must Work To Be Entitled To Postretirement Medical And Life Insurance Benefits | 5 years |  |
Impairment of equity investments | $ 0 | $ 37,730 | $ 0
Natural Gas Gathering And Processing |  |  |
Entity [Line Items] |  |  |
Impairment charges |  | 362,300 |
Goodwill, Impairment Loss |  | 153,400 |
Natural Gas Liquids |  |  |
Entity [Line Items] |  |  |
Impairment charges |  | $ 71,600 |
Venice Energy Services Company [Member] | Natural Gas Gathering And Processing |  |  |
Entity [Line Items] |  |  |
Net ownership percentage |  | 10.20% |
Impairment of equity investments |  | $ 30,500 |
Impairment of equity investments - goodwill |  | $ 22,300 |
Chisholm Pipeline Company [Member] | Natural Gas Liquids |  |  |
Entity [Line Items] |  |  |
Net ownership percentage |  | 50.00% |
Impairment of equity investments |  | $ 7,200 |
Northern Border Pipeline [Member] |  |  |
Entity [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Northern Border Pipeline [Member] | Natural Gas Pipelines |  |  |
Entity [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Roadrunner Gas Transmission [Member] |  |  |
Entity [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Roadrunner Gas Transmission [Member] | Natural Gas Pipelines |  |  |
Entity [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Overland Pass Pipeline Company [Member] |  |  |
Entity [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Overland Pass Pipeline Company [Member] | Natural Gas Liquids |  |  |
Entity [Line Items] |  |  |
Net ownership percentage | 50.00% |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=124268079&loc=d3e32787-111569 + Details
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