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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of information for cash-generating units [line items] |  |
Total | $ 8,868 | $ 9,894
Brazilian Regulated Gas Transmission Operation [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 4,314 | 5,134
Australian regulated terminal |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,852 | 1,957
Peruvian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,137 | 1,144
Chilean toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,010 | 1,100
U.K. port operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 283 | 289
Indian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 114 | 130
Other |  |
Disclosure of information for cash-generating units [line items] |  |
Total | $ 158 | $ 140

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