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DISPOSITION OF BUSINESSES (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 16, 2021 | Jul. 06, 2021 | Jun. 07, 2021 | May 12, 2021 | Dec. 07, 2020 | Feb. 15, 2020 | Feb. 06, 2020 | Jan. 14, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of partial interest to non-controlling interest, net of taxes. |  |  |  |  |  |  |  |  | $ 0 | $ 168 | $ 165
Australian Export Terminal |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  | 22.00% |  |  |  |  |  |
Proceeds from disposition of subsidiary |  |  |  |  | $ 55 |  |  |  |  |  |
Gain on sale of associate |  |  |  |  | 400 |  |  |  |  |  |
Net losses relating to foreign currency translation and net investment hedges reclassified |  |  |  |  | $ 35 |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 49.00% |  |  |  |  |  |
Australian Export Terminal | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposition of subsidiary |  |  |  |  | $ 265 |  |  |  |  |  |
Gain on sale of associate |  |  |  |  | 575 |  |  |  |  |  |
Net losses relating to foreign currency translation and net investment hedges reclassified |  |  |  |  | $ 70 |  |  |  |  |  |
Chilean toll roads |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage | 17.00% |  |  |  |  |  |  |  |  |  |
Gain on sale of associate | $ 140 |  |  |  |  |  |  |  |  |  |
Net losses relating to foreign currency translation and net investment hedges reclassified | (8) |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 165 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  | 0.00% | 17.00% |
Chilean toll roads | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage | 34.00% |  |  |  |  |  |  |  |  |  |
Gain on sale of associate | $ 270 |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 315 |  |  |  |  |  |  |  |  |  |
North American Rail Operation, Australian Operations |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  |  | 51.00% |  |  |  |  |
Proceeds from disposition of subsidiary |  |  |  |  |  | $ 40 |  |  |  |  |
Deferred consideration, acquisition-date fair value |  |  |  |  |  | 195 |  |  |  |  |
North American Rail Operation, Australian Operations | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposition of subsidiary |  |  |  |  |  | $ 420 |  |  |  |  |
Chinese Toll Roads |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  |  |  | 33.00% |  |  |  |
Gain on sale of associate |  |  |  |  |  |  | $ 140 |  |  |  |
Disposal of partial interest to non-controlling interest, net of taxes. |  |  |  |  |  |  | 170 |  |  |  |
Reclassification adjustments on cash flow hedges, net of tax |  |  |  |  |  |  | $ 44 |  |  |  |
Columbian Regulated Distribution Operation |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  |  |  |  | 17.00% |  |  |
Proceeds from disposition of subsidiary |  |  |  |  |  |  |  | $ 88 |  |  |
Gain on sale of associate |  |  |  |  |  |  |  | 36 |  |  |
Net losses relating to foreign currency translation and net investment hedges reclassified |  |  |  |  |  |  |  | 44 |  |  |
Partnership's share of accumulated revaluation surplus |  |  |  |  |  |  |  | 61 |  |  |
Columbian Regulated Distribution Operation | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposition of subsidiary |  |  |  |  |  |  |  | 495 |  |  |
Gain on sale of associate |  |  |  |  |  |  |  | $ 197 |  |  |
North American residential energy infrastructure operation |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  | 40.00% |  |  |  |  |  |  |  |  |
Proceeds from disposition of subsidiary |  | $ 555 |  |  |  |  |  |  |  |  |
Gain on sale of associate |  | 425 |  |  |  |  |  |  |  |  |
Partnership's share of accumulated revaluation surplus |  | $ 150 |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  | 30.00% | 30.00% |
Canadian District Energy Operation |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  | 25.00% |  |  |  |  |  |  |  |
Proceeds from disposition of subsidiary |  |  | $ 450 |  |  |  |  |  |  |  |
Gain on sale of associate |  |  | 295 |  |  |  |  |  |  |  |
Net losses relating to foreign currency translation and net investment hedges reclassified |  |  | (9) |  |  |  |  |  |  |  |
Partnership's share of accumulated revaluation surplus |  |  | 124 |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  | 0.00% | 25.00% |
Canadian District Energy Operation | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of associate |  |  | 1,200 |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 1,800 |  |  |  |  |  |  |  |
U.K. regulated distribution operation |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposition of subsidiary |  |  |  | $ 195 |  |  |  |  |  |  |
Gain on sale of associate |  |  |  | 155 |  |  |  |  |  |  |
Net losses relating to foreign currency translation and net investment hedges reclassified |  |  |  | (12) |  |  |  |  |  |  |
Partnership's share of accumulated revaluation surplus |  |  |  | 142 |  |  |  |  |  |  |
Consideration transferred |  |  |  | 820 |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  | 80.00% | 80.00% |
U.K. regulated distribution operation | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposition of subsidiary |  |  |  | $ 340 |  |  |  |  |  |  |

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