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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of information for cash-generating units [line items] |  |
Total | $ 9,894 | $ 4,465
Brazilian regulated gas transmission operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 5,134 | 0
Australian regulated terminal |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,957 | 1,817
Peruvian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,144 | 1,049
Chilean toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 1,100 | 1,054
U.K. port operation |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 289 | 265
Indian toll roads |  |
Disclosure of information for cash-generating units [line items] |  |
Total | 130 | 136
Other |  |
Disclosure of information for cash-generating units [line items] |  |
Total | $ 140 | $ 144

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