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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 24, 2021 | Oct. 28, 2021 | Sep. 03, 2021 | Aug. 20, 2021 | Aug. 19, 2021 | Apr. 30, 2021 | Feb. 26, 2021 | Aug. 31, 2020 | Jul. 15, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 25, 2021 | Mar. 31, 2020 | Dec. 30, 2019
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 11,537 | $ 8,885 | $ 6,597 |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 2,719 | $ 904 | $ 650 |  |  |
Percentage of voting interest in company |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |
Brazilian electricity transmission operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary, additional | 15.00% |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 31.00% |  |  |  |  |  | 31.00% |  |  |  |  |  |  |  |
Consideration transferred | $ 148 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | 56 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-existing interest in business | $ 92 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Canadian diversified midstream operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary, additional |  | 14.00% | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 59.00% | 45.00% | 41.00% | 3.00% |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 900 |  | $ 2,766 |  |  |  |  |  | 315 |  |  |  |  |
Cash funded consideration |  |  |  | 800 |  |  |  |  |  |  |  |  |  |  |
Cash |  | 400 |  | 1,268 |  |  |  |  |  |  |  |  |  |  |
BIPC exchangeable LP units |  | 500 | $ 11 | 245 |  |  |  |  |  |  |  |  |  |  |
BIPC exchangeable shares |  | 500 |  | 1,061 |  |  |  |  |  |  |  |  | $ 79 |  |
Asset level debt raised |  |  |  | 500 |  |  |  |  |  |  |  |  |  |  |
Pre-existing interest in business |  |  |  | 192 |  |  |  |  |  |  |  |  |  |  |
Acquisition costs recorded |  |  |  | $ 65 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on acquisition of business |  | $ 30 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 906 |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 59 |  |  |  |  |
Canadian diversified midstream operation | Consortium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 24.00% | 7.00% | 69.00% | 10.00% |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 1,600 |  | $ 4,700 |  |  |  |  |  | 530 |  |  |  |  |
Cash funded consideration |  |  |  | 1,900 |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ 1,100 | $ 440 |  |  |  |  |  |  |  |  |  |  |  |
Asset level debt raised |  |  |  | 900 |  |  |  |  |  |  |  |  |  |  |
Pre-existing interest in business |  |  |  | $ 600 |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interest in company |  | 100.00% |  | 76.00% |  |  |  |  |  |  |  |  |  |  |
Indian Telecom Towers Operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  | 17.00% |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  | $ 584 |  |  |  |  |  |  |
Acquisition costs recorded |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |
Indian Telecom Towers Operation | Consortium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  | $ 3,400 |  |  |  |  |  |  |
Columbian Regulated Distribution Operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  | $ 45 |  |  |  |  |  |
Percentage of voting interest in company |  |  |  |  |  |  |  |  | 21.00% |  |  |  |  |  |
Equity funded consideration |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |
Loss recognized as a result of partial acquisition |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |  |
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 |  |  |  |  |  |
Equity funded consideration |  |  |  |  |  |  |  |  | $ 90 |  |  |  |  |  |
North American Rail Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 584
Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 584
Brazilian regulated gas transmission operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary, additional |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 87 |  |  |  |  |  |  |  |  |
Percentage of voting interest in company |  |  |  |  |  | 31.00% |  |  |  |  |  |  |  |  |
Loss recognized as a result of partial acquisition |  |  |  |  |  | $ (32) |  |  |  |  |  |  |  |  |
Brazilian regulated gas transmission operation | Consortium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 283 |  |  |  |  |  |  |  |  |
Individually Insignificant Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  | 84 |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  | 79 |  |  |  |  |
Brazil Electricity Transmission And Individually Insignificant Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma revenue |  |  |  |  |  |  |  |  |  | 13,100 |  |  |  |  |
Pro forma net income |  |  |  |  |  |  |  |  |  | $ 2,900 |  |  |  |  |

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