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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information for cash-generating units [line items]    
Total $ 11,635 $ 9,894
Brazilian regulated gas transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 4,211 5,134
Australian regulated terminal    
Disclosure of information for cash-generating units [line items]    
Total 1,766 1,957
North American Residential Energy Infrastructure Operation [Member]    
Disclosure of information for cash-generating units [line items]    
Total 1,763 0
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,118 1,144
Chilean toll roads    
Disclosure of information for cash-generating units [line items]    
Total 928 1,100
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 843 130
U.K. port operation    
Disclosure of information for cash-generating units [line items]    
Total 273 289
Other    
Disclosure of information for cash-generating units [line items]    
Total $ 733 $ 140