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SEGMENT INFORMATION (Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
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