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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of information for cash-generating units [line items]    
Total $ 9,894 $ 4,465
Brazilian regulated gas transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 5,134 0
Australian regulated terminal    
Disclosure of information for cash-generating units [line items]    
Total 1,957 1,817
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,144 1,049
Chilean toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,100 1,054
U.K. port operation    
Disclosure of information for cash-generating units [line items]    
Total 289 265
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 130 136
Other    
Disclosure of information for cash-generating units [line items]    
Total $ 140 $ 144