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PROPERTY, PLANT AND EQUIPMENT - Valuation Technique (Details) - Property, plant and equipment - Recurring fair value measurement - Discounted cash flow model | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Utilities | Bottom of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Terminal Value Multiple | 7 | 8
Investment Horizon | 10 years | 10 years
Utilities | Top of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Terminal Value Multiple | 23 | 21
Investment Horizon |  | 20 years
Transport | Bottom of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Terminal Value Multiple | 9 | 9
Investment Horizon | 10 years | 10 years
Transport | Top of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Terminal Value Multiple | 14 | 14
Investment Horizon |  | 20 years
Midstream | Bottom of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Terminal Value Multiple | 10 | 10
Investment Horizon | 5 years | 5 years
Midstream | Top of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Investment Horizon | 10 years | 10 years
Interest rate, measurement input | Utilities | Bottom of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets | 0.07 | 0.07
Interest rate, measurement input | Utilities | Top of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets | 0.14 | 0.14
Interest rate, measurement input | Transport | Bottom of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets | 0.07 | 0.07
Interest rate, measurement input | Transport | Top of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets | 0.13 | 0.13
Interest rate, measurement input | Midstream | Top of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets | 0.15 | 0.15

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- Definition The value of significant unobservable input used in the measurement of the fair value of assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_d&doctype=Standard -URIDate 2020-01-01 + Details
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