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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
	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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Interest rate used as a significant Level 3 unobservable input for assets. [Refer: Level 3 of fair value hierarchy [member]]

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 13
-IssueDate 2017-01-01
-Paragraph B36
-Subparagraph a
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