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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of information for cash-generating units [line items] |  |
Total | $ 12,155 | $ 11,635
Brazilian Regulated Gas Transmission Operation [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 4,166 | 4,211
North American Residential Energy Infrastructure Operation [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,806 | 1,763
Australian regulated terminal |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,757 | 1,766
Peruvian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,157 | 1,118
Chilean toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 926 | 928
Indian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 838 | 843
U.K. port operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 271 | 273
Other |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,234 | $ 733
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 739 |
BIF India Holdings Pte Ltd [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Total | $ 99 |

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