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SEGMENT INFORMATION (Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Disclosure of operating segments [line items] |  |
Assets | $ 41,465 | $ 36,580
Reportable segments |  |
Disclosure of operating segments [line items] |  |
Assets | 16,234 | 16,527
Reportable segments | Utilities |  |
Disclosure of operating segments [line items] |  |
Assets | 4,981 | 4,864
Reportable segments | Transport |  |
Disclosure of operating segments [line items] |  |
Assets | 6,203 | 6,424
Reportable segments | Energy |  |
Disclosure of operating segments [line items] |  |
Assets | 5,211 | 4,722
Reportable segments | Comm. Infrastructure |  |
Disclosure of operating segments [line items] |  |
Assets | 1,804 | 1,446
Reportable segments | Corporate |  |
Disclosure of operating segments [line items] |  |
Assets | (1,965) | (929)
Contribution from investments in associates |  |
Disclosure of operating segments [line items] |  |
Assets | (2,324) | (2,350)
Attributable to non- controlling interest |  |
Disclosure of operating segments [line items] |  |
Assets | 21,064 | 17,545
Working capital adjustment and other |  |
Disclosure of operating segments [line items] |  |
Assets | $ 6,491 | $ 4,858

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