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SEGMENT INFORMATION (Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]    
Assets $ 28,830 $ 29,477
Reportable segments    
Disclosure of operating segments [line items]    
Assets 14,680 16,632
Reportable segments | Utilities    
Disclosure of operating segments [line items]    
Assets 4,828 6,542
Reportable segments | Transport    
Disclosure of operating segments [line items]    
Assets 6,457 6,990
Reportable segments | Energy    
Disclosure of operating segments [line items]    
Assets 3,104 3,134
Reportable segments | Comm. Infrastructure    
Disclosure of operating segments [line items]    
Assets 1,072 1,049
Reportable segments | Corporate    
Disclosure of operating segments [line items]    
Assets (781) (1,083)
Contribution from investments in associates    
Disclosure of operating segments [line items]    
Assets (2,391) (3,134)
Attributable to non- controlling interest    
Disclosure of operating segments [line items]    
Assets 12,115 11,668
Working capital adjustment and other    
Disclosure of operating segments [line items]    
Assets $ 4,426 $ 4,311