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PROPERTY, PLANT AND EQUIPMENT - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Utilities |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Right-of-use assets | $ 159 | $ 156
Transport |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Right-of-use assets | 1,187 | 1,329
Midstream |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Right-of-use assets | 113 | 116
Data |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Right-of-use assets | 2,643 | 560
Accumulated fair value adjustments: |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Gain from revaluation | 786 | 719
Accumulated fair value adjustments: | Utilities |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Gain from revaluation | 652 | 582
Accumulated fair value adjustments: | Transport |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Gain from revaluation | 113 | 45
Accumulated fair value adjustments: | Midstream |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Gain from revaluation | 21 | 92
Accumulated fair value adjustments: | Data |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Gain from revaluation | $ 0 | $ 0

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from revaluations to fair value. [Refer: Property, plant and equipment; Revaluation surplus] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_iv&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 77 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_77_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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