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GOODWILL - Cash Generating Units (Details) - Goodwill - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | $ 14,488 | $ 8,789 | $ 8,979
North American rail operation |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 2,098 | 2,094 |
Canadian diversified midstream operation |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 2,028 | 1,984 |
European residential decarbonization infrastructure business |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 1,881 | 0 |
Global intermodal logistics operation |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 1,163 | 0 |
North American residential decarbonization infrastructure operation |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 3,117 | 1,463 |
Canadian natural gas gathering and processing operation |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 726 | 710 |
Colombian natural gas distribution operation |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 461 | 367 |
Brazilian regulated gas transmission operation |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 526 | 488 |
European hyperscale data center platform |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 797 | 0 |
U.S. colocation data center operation |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 503 | 503 |
U.K. wireless infrastructure operation |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 350 | 332 |
Other |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | $ 838 | $ 848 |

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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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