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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($) |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 30, 2019 | Dec. 19, 2019 | Mar. 22, 2019 | Jan. 04, 2019 | Dec. 31, 2019 | Jun. 30, 2020
Indian Natural Gas Operation [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 24.00% |  |  |
Total consideration |  |  |  |  | $ 443,000,000 |  |  |
Equity funded consideration |  |  |  |  | 226,000,000 |  |  |
Asset level debt raised |  |  |  |  | 217,000,000 |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  | $ 3,000,000 |
Cash |  |  |  |  | 443,000,000 |  |  |
Indian Natural Gas Operation [Member] | Consortium |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total consideration |  |  |  |  | 1,879,000,000 |  |  |
Equity funded consideration |  |  |  |  | 959,000,000 |  |  |
Asset level debt raised |  |  |  |  | $ 920,000,000 |  |  |
Australian Data Center Operation [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  | 29.00% |  |
Total consideration |  |  |  |  |  | $ 78,000,000 |  |
Equity funded consideration |  |  |  |  |  | 48,000,000 |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  | 11,000,000 |
Goodwill expected to be deductible for tax purposes |  |  |  |  |  | 0 |  |
Cash |  |  |  |  |  | 78,000,000 |  |
Australian Data Center Operation [Member] | Consortium |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  | 272,000,000 |  |
Equity funded consideration |  |  |  |  |  | $ 166,000,000 |  |
Western Canadian Natural Gas Gathering and Processing Operation [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 29.00% |  |  |  |  |  |  |
Total consideration | $ 377,000,000 | $ 377,000,000 |  |  |  |  | 377,000,000 |
Equity funded consideration | 246,000,000 | 246,000,000 |  |  |  |  | 246,000,000 |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  | 8,000,000 |
Cash | 377,000,000 | 377,000,000 |  |  |  |  | 377,000,000 |
Western Canadian Natural Gas Gathering and Processing Operation [Member] | Consortium |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total consideration | 1,300,000,000 | 1,300,000,000 |  |  |  |  | 1,300,000,000 |
Equity funded consideration | $ 861,000,000 | 861,000,000 |  |  |  |  | 861,000,000 |
North American Rail Operation |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 9.00% |  |  |  |  |
Total consideration |  |  | $ 602,000,000 |  |  |  |  |
Equity funded consideration |  |  | 502,000,000 |  |  |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  | 38,000,000 |
Goodwill expected to be deductible for tax purposes |  |  | 0 |  |  |  |  |
Cash |  |  | 602,000,000 |  |  |  |  |
North American Rail Operation | Consortium |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total consideration |  |  | 6,500,000,000 |  |  |  |  |
Equity funded consideration |  |  | $ 5,400,000,000 |  |  |  |  |
U.K. Telecommunications [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  | 25.00% |  |  |  |
Total consideration |  |  |  | $ 141,000,000 |  |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  | $ 6,000,000 |
Cash |  |  |  | 73,000,000 |  |  |  |
Increase through business combinations, deferred tax liability |  | $ 25,000,000 |  |  |  |  |  |
Deferred consideration, acquisition-date fair value |  |  |  | 68,000,000 |  |  |  |
U.K. Telecommunications [Member] | Consortium |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total consideration |  |  |  | 564,000,000 |  |  |  |
Cash |  |  |  | 293,000,000 |  |  |  |
Deferred consideration, acquisition-date fair value |  |  |  | $ 270,000,000 |  |  |  |
Aggregated individually immaterial business combinations |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  | $ 54,000,000
Cash |  |  |  |  |  |  |  | $ 24,000,000

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