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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($) $ in Millions |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2021 | Aug. 31, 2020 | Jul. 15, 2020 | Jun. 30, 2021
Aggregated individually immaterial business combinations |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total consideration |  |  |  | $ 96
Pro Forma [Member] |  |  |  |
Business Acquisition, Proforma Revenue |  |  |  | 5,400
Business Acquisition, Proforma Income |  |  |  | $ 1,700
Indian Telecom Towers Operation |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  | 17.00% |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  | $ 15 |  |
Total consideration |  | 584 |  |
Indian Telecom Towers Operation | Consortium |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total consideration |  | $ 3,400 |  |
Columbian Regulated Distribution Operation |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 6.00% |
Equity funded consideration |  |  | $ 25 |
Percentage of voting interest in company |  |  | 21.00% |
Total consideration |  |  | $ 45 |
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination |  |  | $ (10) |
Columbian Regulated Distribution Operation | Consortium |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 20.00% |
Equity funded consideration |  |  | $ 90 |
Total consideration |  |  | $ 150 |
Brazilian Regulated Gas Transmission Operation |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Proportion of ownership interest in subsidiary | 3.00% |  |  |
Percentage of voting interest in company | 31.00% |  |  |
Total consideration | $ 87 |  |  |
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination | $ (32) |  |  |
Brazilian Regulated Gas Transmission Operation | Consortium |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Proportion of ownership interest in subsidiary | 10.00% |  |  |
Total consideration | $ 283 |  |  |

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