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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure of information for cash-generating units [line items]    
Total $ 12,155 $ 11,635
Brazilian Regulated Gas Transmission Operation [Member]    
Disclosure of information for cash-generating units [line items]    
Total 4,166 4,211
North American Residential Energy Infrastructure Operation [Member]    
Disclosure of information for cash-generating units [line items]    
Total 1,806 1,763
Australian regulated terminal    
Disclosure of information for cash-generating units [line items]    
Total 1,757 1,766
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,157 1,118
Chilean toll roads    
Disclosure of information for cash-generating units [line items]    
Total 926 928
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 838 843
U.K. port operation    
Disclosure of information for cash-generating units [line items]    
Total 271 273
Other    
Disclosure of information for cash-generating units [line items]    
Total 1,234 $ 733
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd [Member]    
Disclosure of information for cash-generating units [line items]    
Total 739  
BIF India Holdings Pte Ltd [Member]    
Disclosure of information for cash-generating units [line items]    
Total $ 99