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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Change in Investments (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 13, 2025 | Jun. 12, 2025 | May 09, 2025 | Apr. 29, 2025 | Mar. 26, 2025 | Dec. 30, 2024 | Dec. 23, 2024 | Apr. 18, 2024 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Reconciliation of changes in associates and joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  |  |  | $ 5,672 |  | $ 5,672 | $ 5,402 | $ 5,402
Share of earnings for the period |  |  |  |  |  |  |  |  | $ (12) |  | $ 95 | 111 | 136 | 439
Foreign currency translation and other |  |  |  |  |  |  |  |  |  |  |  | 772 |  | (542)
Share of other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |  | (423) |  | 361
Distributions |  |  |  |  |  |  |  |  |  |  |  | (339) |  | (283)
Disposition of interest |  |  |  |  |  |  |  |  |  |  |  | (1,030) |  | (55)
Acquisitions |  |  |  |  |  |  |  |  |  |  |  | 606 |  | 350
Balance at end of year |  |  |  |  |  |  |  |  | 5,369 |  |  | 5,369 |  | $ 5,672
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  |  |  |  | $ 674 |  | $ 0 | $ 674 | $ 0 |
Global intermodal logistics operation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  | $ 120 |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  | 67.00% |  |  |  |  | 33.00% |  |  |  |
Brazilian rail and port logistics business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary, additional |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  | $ 350 |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  | 21.00% |  |  |  |  |  |
Brazilian electricity transmission operation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary, additional |  |  |  | 15.00% |  |  | 15.00% |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  | 31.00% |  |  | 31.00% |  |  |  |  |  |  |
French telecom infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |
Gain (Loss) on sale of investments accounted for using equity method |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |
Mexican regulated natural gas transmission pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  |  |  |  |  | $ 125 |  |  |  |
Gain (Loss) on sale of investments accounted for using equity method |  |  |  |  |  |  |  |  |  | $ 75 |  |  |  |
U.S. Gas Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on sale of investments accounted for using equity method |  |  | $ 160 |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Revaluation gains |  |  | $ 70 |  |  |  |  |  |  |  |  |  |  |
Australian export terminal |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures | $ 280 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on sale of investments accounted for using equity method | $ 75 |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage | 23.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate | 26.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments on exchange differences on translation, net of tax | $ 35 |  |  |  |  |  |  |  |  |  |  |  |  |

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