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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, 2018 | Dec. 31, 2017
Utilities | Bottom of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Discount Rate | 7.00% | 7.00%
Terminal Value Multiple | 8 | 7
Investment Horizon | 10 years | 10 years
Utilities | Top of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Discount Rate | 14.00% | 12.00%
Terminal Value Multiple | 22 | 21
Investment Horizon | 20 years | 20 years
Transport | Bottom of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Discount Rate | 10.00% | 10.00%
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] |  |
Discount Rate | 13.00% | 15.00%
Terminal Value Multiple | 14 | 14
Investment Horizon | 20 years | 20 years
Energy |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Investment Horizon | 10 years | 10 years
Energy | Bottom of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Discount Rate | 12.00% | 12.00%
Terminal Value Multiple | 10 | 8
Energy | Top of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Discount Rate | 15.00% | 15.00%
Terminal Value Multiple | 14 | 13
Data Infrastructure [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Investment Horizon | 10 years | 0 years
Data Infrastructure [Member] | Bottom of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Discount Rate | 13.00% | 0.00%
Terminal Value Multiple | 10 | 0
Data Infrastructure [Member] | Top of range |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Discount Rate | 15.00% | 0.00%
Terminal Value Multiple | 11 | 0

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- Definition Interest rate used as a significant Level 3 unobservable input for assets. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph B36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_B36_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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