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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