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SEGMENT INFORMATION (Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Assets $ (51,322) $ (56,308)
Reportable segments    
Disclosure of operating segments [line items]    
Assets (17,465) (19,250)
Reportable segments | Utilities    
Disclosure of operating segments [line items]    
Assets (5,224) (5,825)
Reportable segments | Transport    
Disclosure of operating segments [line items]    
Assets (5,780) (6,916)
Reportable segments | Energy    
Disclosure of operating segments [line items]    
Assets (5,458) (5,589)
Reportable segments | Data Infrastructure    
Disclosure of operating segments [line items]    
Assets (2,114) (2,204)
Reportable segments | Corporate    
Disclosure of operating segments [line items]    
Assets 1,111 1,284
Contribution from investments in associates    
Disclosure of operating segments [line items]    
Assets (2,762) (2,884)
Attributable to non- controlling interest    
Disclosure of operating segments [line items]    
Assets (28,970) (32,621)
Working capital adjustment and other    
Disclosure of operating segments [line items]    
Assets $ (7,649) $ (7,321)