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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Disclosure of information for cash-generating units [line items] |  |
Total | $ 12,406 | $ 11,767
Brazilian Regulated Gas Transmission Operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 2,949 | 2,903
North American Rail Operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,906 | 1,929
North American Residential Energy Infrastructure Operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,759 | 1,748
Peruvian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,011 | 1,073
Chilean toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 781 | 825
Indian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 679 | 714
Brazil electricity transmission operation [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 803 | 270
Indian Telecom Towers Operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 796 | 537
U.K. Telecom Towers Operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 494 | 491
U.K. port operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 296 | 292
Other |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 932 | $ 985
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 614 |
BIF India Holdings Pte Ltd |  |
Disclosure of information for cash-generating units [line items] |  |
Total | $ 65 |

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