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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($) |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Jul. 15, 2020 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 30, 2019 | Dec. 19, 2019 | Mar. 22, 2019 | Jan. 04, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 8,885,000,000 | $ 6,597,000,000 | $ 4,652,000,000 |
Net income (loss) |  |  |  |  |  |  |  |  | 904,000,000 | 650,000,000 | $ 806,000,000 |
Percentage of voting interest in company |  |  |  |  |  |  |  |  |  |  |  | 75.00%
Deferred tax liability |  |  |  |  |  |  |  |  | (179,000,000) | 1,024,000,000 |  |
Indian telecom towers operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 17.00% |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 584,000,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition costs recorded | 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 360,000,000 |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 8,000,000 |  |  |
Cash | 584,000,000 |  |  |  |  |  |  |  |  |  |  |
Pro forma revenue |  |  |  |  |  |  |  |  | 9,600,000,000 |  |  |
Pro forma net income |  |  |  |  |  |  |  |  | $ 900,000,000 |  |  |
Indian telecom towers operation | Consortium |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 3,400,000,000 |  |  |  |  |  |  |  |  |  |  |
Columbian Regulated Distribution Operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 6.00% |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |
Percentage of voting interest in company |  | 21.00% |  |  |  |  |  |  |  |  |  |
Equity funded consideration |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |
Loss recognized as a result of partial acquisition |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Columbian Regulated Distribution Operation | Consortium |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 20.00% |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |
Equity funded consideration |  | $ 90,000,000 |  |  |  |  |  |  |  |  |  |
Western Canadian natural gas midstream business |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 29.00% |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 377,000,000 | $ 377,000,000 |  |  |  |  |  | 377,000,000 |  |
Acquisition costs recorded |  |  |  |  |  |  |  |  |  | 8,000,000 |  |
Equity funded consideration |  |  | 246,000,000 | 246,000,000 |  |  |  |  |  | 246,000,000 |  |
Cash |  |  | 377,000,000 | 377,000,000 |  |  |  |  |  | 377,000,000 |  |
Western Canadian natural gas midstream business | Consortium |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | 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 Business |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 9.00% |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 602,000,000 |  |  |  |  |  |  |
Acquisition costs recorded |  |  |  |  |  |  |  |  |  | 38,000,000 |  |
Equity funded consideration |  |  |  |  | 502,000,000 |  |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  |  |  | 0 |  |  |  |  |  |  |
Cash |  |  |  |  | 602,000,000 |  |  |  |  |  |  |
North American Rail Business | Consortium |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | 6,500,000,000 |  |  |  |  |  |  |
Equity funded consideration |  |  |  |  | $ 5,400,000,000 |  |  |  |  |  |  |
U.K. Telecommunications |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  | 25.00% |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 141,000,000 |  |  |  |  |  |
Acquisition costs recorded |  |  |  |  |  |  |  |  |  | 6,000,000 |  |
Cash |  |  |  |  |  | 73,000,000 |  |  |  |  |  |
Deferred consideration |  |  |  |  |  | $ 68,000,000 |  |  |  |  |  |
Period of payable from close of transaction |  |  |  |  |  | 2 years |  |  |  |  |  |
Deferred tax liability |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |
U.K. Telecommunications | Consortium |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 564,000,000 |  |  |  |  |  |
Cash |  |  |  |  |  | 293,000,000 |  |  |  |  |  |
Deferred consideration |  |  |  |  |  | $ 270,000,000 |  |  |  |  |  |
Indian gas transmission operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  | 24.00% |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 443,000,000 |  |  |  |  |
Acquisition costs recorded |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Equity funded consideration |  |  |  |  |  |  | 226,000,000 |  |  |  |  |
Cash |  |  |  |  |  |  | 443,000,000 |  |  |  |  |
Asset level debt raised |  |  |  |  |  |  | 217,000,000 |  |  |  |  |
Indian gas transmission operation | Consortium |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | 1,879,000,000 |  |  |  |  |
Equity funded consideration |  |  |  |  |  |  | 959,000,000 |  |  |  |  |
Asset level debt raised |  |  |  |  |  |  | $ 920,000,000 |  |  |  |  |
Australian data center operation |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  | 29.00% |  |  |  |
Consideration transferred |  |  |  |  |  |  |  | $ 78,000,000 |  |  |  |
Acquisition costs recorded |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |
Equity funded consideration |  |  |  |  |  |  |  | 48,000,000 |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  |  |  |  |  |  | 0 |  |  |  |
Cash |  |  |  |  |  |  |  | 78,000,000 |  |  |  |
Australian data center operation | Consortium |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  | 272,000,000 |  |  |  |
Equity funded consideration |  |  |  |  |  |  |  | $ 166,000,000 |  |  |  |

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