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INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 14,386 $ 11,635  
Intangible assets with indefinite useful life 667 653  
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 680    
BIF India Holdings Pte Ltd      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 89    
North American residential energy infrastructure operation      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 1,806 1,763  
Australian regulated terminal      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 1,758 1,766  
Percent of take or pay contracts 100.00%    
Period of additional extension on take or pay contracts 49 years    
Peruvian toll roads      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 1,159 1,118  
Revenue from construction contracts 14 13 $ 12
Profit (loss) recognised on exchanging construction services for financial asset 0 0 0
Borrowing costs capitalised $ 3 $ 3 $ 6
Bottom of range | North American residential energy infrastructure operation      
Disclosure of detailed information about intangible assets [line items]      
Useful lives or amortisation rates, intangible assets other than goodwill 10 years    
Top of range | North American residential energy infrastructure operation      
Disclosure of detailed information about intangible assets [line items]      
Useful lives or amortisation rates, intangible assets other than goodwill 20 years