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SEGMENT INFORMATION (Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of operating segments [line items] |  |
Assets | $ 28,830 | $ 29,477
Reportable segments |  |
Disclosure of operating segments [line items] |  |
Assets | 14,680 | 16,632
Reportable segments | Utilities |  |
Disclosure of operating segments [line items] |  |
Assets | 4,828 | 6,542
Reportable segments | Transport |  |
Disclosure of operating segments [line items] |  |
Assets | 6,457 | 6,990
Reportable segments | Energy |  |
Disclosure of operating segments [line items] |  |
Assets | 3,104 | 3,134
Reportable segments | Comm. Infrastructure |  |
Disclosure of operating segments [line items] |  |
Assets | 1,072 | 1,049
Reportable segments | Corporate |  |
Disclosure of operating segments [line items] |  |
Assets | (781) | (1,083)
Contribution from investments in associates |  |
Disclosure of operating segments [line items] |  |
Assets | (2,391) | (3,134)
Attributable to non- controlling interest |  |
Disclosure of operating segments [line items] |  |
Assets | 12,115 | 11,668
Working capital adjustment and other |  |
Disclosure of operating segments [line items] |  |
Assets | $ 4,426 | $ 4,311

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