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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Additional Information (Details)								3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 19, 2019	Oct. 21, 2019 USD ($)	Oct. 21, 2019	Oct. 07, 2019	Jul. 31, 2019 USD ($)	Jun. 25, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Disclosure Of Associates And Joint Ventures [Line Items]
Proceeds from sales of investments accounted for using equity method								$ 0	$ 135,000,000	$ 0	$ 135,000,000
Investments Reclassified as Held for Sale										2,000,000		$ 38,000,000
Acquisitions										$ 0		$ 587,000,000
Ramones II Sur [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership Interest			11.00%
Proportion of voting rights held in associate										45.00%
Los Ramones [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Acquisitions		$ 140,000,000
North American Natural Gas Transmission Operation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Loans and receivables								$ 500,000,000		$ 500,000,000
European port operation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Proceeds from sales of investments accounted for using equity method						$ 135,000,000
Ownership Interest						40.00%
Texas electricity transmission project [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Investments Reclassified as Held for Sale										$ 2,000,000
Ownership Interest	11.00%
Brazilian Data Center Operation [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership Interest							12.00%
Acquisitions							$ 190,000,000
Proportion of voting rights held in associate							50.00%
New Zealand Data Distribution Business [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership Interest					12.00%
Acquisitions					$ 170,000,000
Proportion of voting rights held in associate					50.00%
Ramones II Norte [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership Interest				13.00%
Proportion of voting rights held in associate										50.00%
European Telecommunications Infrastructure Operations [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Number of Towers and Rooftop Sites								7,000		7,000
Kilometers of Fiber Backbone								5,500		5,500
Forecast [Member] | Texas electricity transmission project [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Proceeds from sales of investments accounted for using equity method										$ 60,000,000

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Acquisitions Of Joint Ventures And Associates

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[Line Items] for Disclosure Of Associates And Joint Ventures [Table]

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The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets]

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The proportion of the voting rights in an associate held by the entity. [Refer: Associates [member]]

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