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GOODWILL - Cash Generating Units (Details) - Goodwill - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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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
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