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SUBSEQUENT EVENTS SUBSEQUENT EVENTS (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 07, 2019 | Jan. 04, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  | $ 1,289 | $ 0 | $ 0
Australian Data Center Operation | Australian Data Center Operation |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 29.00% |  |  |
Consideration transferred |  | $ 78 |  |  |
Equity interests of acquirer |  | 48 |  |  |
Total assets recognised as of acquisition date |  | 276 |  |  |
Total liabilities recognised as of acquisition date |  | 4 |  |  |
Non-controlling interest in acquiree recognised at acquisition date |  | 194 |  |  |
Consortium | Australian Data Center Operation | Australian Data Center Operation |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Consideration transferred |  | 272 |  |  |
Equity interests of acquirer |  | $ 166 |  |  |
Chilean toll roads | Chilean toll roads |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Ownership and Voting Interest | 17.00% |  |  |  |
Proceeds from sales of investments accounted for using equity method | $ 195 |  |  |  |

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