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INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 11,635 | $ 9,894 |
Intangible assets with indefinite useful life | 653 | 297 |
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 738 |  |
BIF India Holdings Pte Ltd [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 105 |  |
Australian regulated terminal |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 1,766 | 1,957 |
Percent of take or pay contracts | 100.00% |  |
Period of additional extension on take or pay contracts | 49 years |  |
North American Residential Energy Infrastructure Operation [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 1,763 | 0 |
Peruvian toll roads |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 1,118 | 1,144 |
Revenue from construction contracts | 16 | 31 | $ 66
Profit (loss) recognised on exchanging construction services for financial asset | 0 | 0 | 0
Borrowing costs capitalised | 16 | 35 | $ 20
Chilean toll roads |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 928 | $ 1,100 |
Annual percent adjustment consumer price index | 3.50% |  |
Bottom of range | North American Residential Energy Infrastructure Operation [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 10 |  |
Top of range | North American Residential Energy Infrastructure Operation [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 20 |  |

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