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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of information for cash-generating units [line items] |  |
Total | $ 11,767 | $ 14,386
Brazilian regulated gas transmission operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 2,903 | 3,885
North American rail operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,929 | 1,992
North American residential energy infrastructure operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,748 | 1,806
Peruvian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,073 | 1,159
Chilean toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 825 | 814
Indian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 714 | 769
Indian telecom towers operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 537 | 0
U.K. telecom towers operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 491 | 472
U.K. ports operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 292 | 283
Brazilian electricity transmission operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 270 | 401
Other |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 985 | 1,047
Australian export terminal |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 0 | $ 1,758
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 641 |
Indian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | $ 73 |

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