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INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 11,767 | $ 14,386
Intangible assets with indefinite useful life | 876 | 667
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | 641 |
BIF India Holdings Pte Ltd |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | 73 |
North American residential energy infrastructure operation |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | 1,748 | 1,806
Australian export terminal |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | 0 | 1,758
Peruvian toll roads |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 1,073 | $ 1,159

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