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SEGMENT INFORMATION (Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
Assets $ 36,580 $ 29,477 $ 21,275
Reportable segments      
Disclosure of operating segments [line items]      
Assets 16,527 16,632  
Reportable segments | Utilities      
Disclosure of operating segments [line items]      
Assets 4,864 6,542  
Reportable segments | Transport      
Disclosure of operating segments [line items]      
Assets 6,424 6,990  
Reportable segments | Energy      
Disclosure of operating segments [line items]      
Assets 4,722 3,134  
Reportable segments | Data Infrastructure      
Disclosure of operating segments [line items]      
Assets 1,446 1,049  
Reportable segments | Corporate      
Disclosure of operating segments [line items]      
Assets (929) (1,083)  
Contribution from investments in associates      
Disclosure of operating segments [line items]      
Assets (2,350) (3,134)  
Attributable to non- controlling interest      
Disclosure of operating segments [line items]      
Assets 17,545 11,668  
Working capital adjustment and other      
Disclosure of operating segments [line items]      
Assets $ 4,858 $ 4,311