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INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 11,635 $ 9,894  
Intangible assets with indefinite useful life 653 297  
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 738    
BIF India Holdings Pte Ltd [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 105    
Australian regulated terminal      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 1,766 1,957  
Percent of take or pay contracts 100.00%    
Period of additional extension on take or pay contracts 49 years    
North American Residential Energy Infrastructure Operation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 1,763 0  
Peruvian toll roads      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 1,118 1,144  
Revenue from construction contracts 16 31 $ 66
Profit (loss) recognised on exchanging construction services for financial asset 0 0 0
Borrowing costs capitalised 16 35 $ 20
Chilean toll roads      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 928 $ 1,100  
Annual percent adjustment consumer price index 3.50%    
Bottom of range | North American Residential Energy Infrastructure Operation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Useful lives or amortisation rates, intangible assets other than goodwill 10    
Top of range | North American Residential Energy Infrastructure Operation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Useful lives or amortisation rates, intangible assets other than goodwill 20