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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
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2026 | Jan. 01, 2026 | Oct. 02, 2025 | Oct. 01, 2025 | Sep. 29, 2025 | Sep. 24, 2025 | May 09, 2025 | Apr. 29, 2025 | Mar. 26, 2025 | Jun. 30, 2026 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Reconciliation of changes in associates and joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  | $ 6,377 |  |  |  |  |  |  |  |  |  |  | $ 5,672 | $ 6,377 | $ 5,672 | $ 5,672
Share of (loss) earnings for the period |  |  |  |  |  |  |  |  |  | $ 33 |  | $ (12) |  | (8) | 111 | 627
Foreign currency translation and other |  |  |  |  |  |  |  |  |  |  |  |  |  | (5) |  | 706
Share of other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | 145 |  | (372)
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  | (193) |  | (1,112)
Disposition of interest |  |  |  |  |  |  |  |  |  |  |  |  |  | (43) |  | (1,557)
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  | 687 |  | 2,413
Ending Balance | $ 6,960 |  |  |  |  |  |  |  |  | 6,960 |  |  |  | 6,960 |  | 6,377
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  |  |  |  |  | $ 66 |  | $ 674 |  | $ 66 | $ 674 |
Global intermodal logistics operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  | 33.00% |  |  |  | 33.00% |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  | $ 425 |  |  |  | $ 120 |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  |  |  |  |  | 67.00% |  |  |  |  |  |  |
Gains on sale of investments accounted for using equity method |  |  |  |  | 115 |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  | 33.00% |  | 33.00% |  |  |
Global intermodal logistics operation | Brookfield Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  | 115 |  |  |  |  |  |  |  |  |  |  |
Gains on sale of investments accounted for using equity method |  |  |  |  | $ 30 |  |  |  |  |  |  |  |  |  |  |
European Hyperscale Data Center Platform |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  |  |  |  |  |  | $ 1,700 |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |
European Hyperscale Data Center Platform | Brookfield Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  |  |  |  |  |  | $ 310 |  |  |  |  |
U.K. Port Operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  | $ 380 |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Brookfield Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 25.00% | 34.00% |  |  |  |  |  |  |  |  |  |  |  |
GATX Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  | 900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bulk fiber network |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage | 80.00% |  |  |  |  |  |  |  |  | 80.00% |  |  |  | 80.00% |  |
Proportion of ownership interest in associate | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brazilian electricity transmission operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary, additional |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  | 31.00% |  |  |  |  |  |  |  |
U.S. Gas Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |
Gains on sale of investments accounted for using equity method |  |  |  |  |  |  | 160 |  |  |  |  |  |  |  |  |
Revaluation gains |  |  |  |  |  |  | $ 70 |  |  |  |  |  |  |  |  |
Australian export terminal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  |  |  |  |  | $ 495 |  |  |  |  |  |  |  |  |  | 630
Gains on sale of investments accounted for using equity method |  |  |  |  |  | 365 |  |  |  |  |  |  |  |  |  | 165
Reclassification adjustments on exchange differences on translation, net of tax |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  | 63
U.K. Port Operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  | 34.00% |  |  |  |  |  |  |  |  |  |  |  |
South Korean Industrial Gas Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500
South Korean Industrial Gas Business | Brookfield Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125
South Korean Industrial Gas Business | GATX Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in associates and joint ventures |  | $ 230 |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Semiconductor Manufacturing Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity commitment funding |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |

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