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DISPOSITION OF BUSINESSES - Additional Information (Details) - USD ($) $ in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 07, 2020 | Feb. 15, 2020 | Feb. 06, 2020 | Jan. 14, 2020 | Feb. 07, 2019 | Nov. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |
Gain on sale of associate |  |  |  |  |  |  | $ 0 | $ 0 | $ 338
Disposal of partial interest to non-controlling interest, net of taxes. |  |  |  |  |  |  | 168 | 165 | 0
Disposal of investments in associates and joint ventures |  |  |  |  |  |  | 0 | 135 | 1,289
Investments accounted for using equity method |  |  |  |  |  |  | $ 5,528 | 4,967 | $ 4,591
Australia District Energy Business |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |
Gain on sale of associate |  |  |  |  |  | $ 62 |  |  |
Net losses relating to foreign currency translation and net investment hedges reclassified |  |  |  |  |  | 35 |  | $ (12) |
Partnership's share of accumulated revaluation surplus |  |  |  |  |  | 12 |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  | 277 |  |  |
Investments accounted for using equity method |  |  |  |  |  | 215 |  |  |
Transaction related costs |  |  |  |  |  | $ 5 |  |  |
Chilean toll roads |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  |  |  | 33.00% | 33.00% |
Gain on sale of associate |  |  |  |  | $ 354 |  |  |  |
Net losses relating to foreign currency translation and net investment hedges reclassified |  |  |  |  | 38 |  | $ (44) | $ (38) |
Disposal of investments in associates and joint ventures |  |  |  |  | $ 365 |  |  |  |
Ownership and voting Interest |  |  |  |  | 17.00% |  |  |  |
Dividends received |  |  |  |  | $ 200 |  |  |  |
Partnership's share of proceeds from sales of investments accounted for using equity method |  |  |  |  | $ 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 |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 49.00% |  |  |  |  |  | 0.00% | 71.00% |
Net losses relating to foreign currency translation and net investment hedges reclassified | $ 35 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
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 |  | 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 |  |  |  |  |

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