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SEGMENT INFORMATION (Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Assets $ 56,308 $ 36,580 $ 29,477
Reportable segments      
Disclosure of operating segments [line items]      
Assets 19,250 16,527  
Reportable segments | Utilities      
Disclosure of operating segments [line items]      
Assets 5,825 4,864  
Reportable segments | Transport      
Disclosure of operating segments [line items]      
Assets 6,916 6,424  
Reportable segments | Energy      
Disclosure of operating segments [line items]      
Assets 5,589 4,722  
Reportable segments | Data Infrastructure      
Disclosure of operating segments [line items]      
Assets 2,204 1,446  
Reportable segments | Corporate      
Disclosure of operating segments [line items]      
Assets (1,284) (929)  
Contribution from investments in associates      
Disclosure of operating segments [line items]      
Assets (2,884) (2,350)  
Attributable to non- controlling interest      
Disclosure of operating segments [line items]      
Assets 32,621 17,545  
Working capital adjustment and other      
Disclosure of operating segments [line items]      
Assets $ 7,321 $ 4,858