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SEGMENT INFORMATION (Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of operating segments [line items] |  |  |
Assets | $ 29,477 | $ 21,275 | $ 17,735
Reportable segments |  |  |
Disclosure of operating segments [line items] |  |  |
Assets | 16,632 | 14,220 |
Reportable segments | Utilities |  |  |
Disclosure of operating segments [line items] |  |  |
Assets | 6,542 | 4,605 |
Reportable segments | Transport |  |  |
Disclosure of operating segments [line items] |  |  |
Assets | 6,990 | 6,160 |
Reportable segments | Energy |  |  |
Disclosure of operating segments [line items] |  |  |
Assets | 3,134 | 3,032 |
Reportable segments | Comm. Infrastructure |  |  |
Disclosure of operating segments [line items] |  |  |
Assets | 1,049 | 933 |
Reportable segments | Corporate |  |  |
Disclosure of operating segments [line items] |  |  |
Assets | (1,083) | (510) |
Contribution from investments in associates |  |  |
Disclosure of operating segments [line items] |  |  |
Assets | (3,134) | (2,996) |
Attributable to non- controlling interest |  |  |
Disclosure of operating segments [line items] |  |  |
Assets | 11,668 | 6,496 |
Working capital adjustment and other |  |  |
Disclosure of operating segments [line items] |  |  |
Assets | $ 4,311 | $ 3,555 |

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