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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of information for cash-generating units [line items] |  |
Total | $ 14,214 | $ 11,767
Brazilian regulated gas transmission operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 2,645 | 2,903
Canadian diversified midstream operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 2,536 | 0
North American rail operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,867 | 1,929
North American residential energy infrastructure operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,720 | 1,748
Brazil electricity transmission operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,366 | 270
Peruvian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 976 | 1,073
Indian Telecom Towers Operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 782 | 537
Indian Toll Roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 658 | 714
U.K. telecom towers operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 480 | 491
U.K. ports operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 289 | 292
Other |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 895 | 985
Chilean toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 0 | $ 825
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 604 |
Indian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | $ 54 |

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