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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Disclosure of information for cash-generating units [line items]    
Total $ 8,868 $ 9,894
Brazilian Regulated Gas Transmission Operation [Member]    
Disclosure of information for cash-generating units [line items]    
Total 4,314 5,134
Australian regulated terminal    
Disclosure of information for cash-generating units [line items]    
Total 1,852 1,957
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,137 1,144
Chilean toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,010 1,100
U.K. port operation    
Disclosure of information for cash-generating units [line items]    
Total 283 289
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 114 130
Other    
Disclosure of information for cash-generating units [line items]    
Total $ 158 $ 140