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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 30, 2019
Dec. 19, 2019
Mar. 22, 2019
Jan. 04, 2019
Dec. 31, 2019
Jun. 30, 2020
Indian Natural Gas Operation [Member]                
Disclosure of detailed information about business combination [line items]                
Proportion of ownership interest in subsidiary         24.00%      
Total consideration         $ 443,000,000      
Equity funded consideration         226,000,000      
Asset level debt raised         217,000,000      
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination             $ 3,000,000  
Cash         443,000,000      
Indian Natural Gas Operation [Member] | Consortium                
Disclosure of detailed information about business combination [line items]                
Total consideration         1,879,000,000      
Equity funded consideration         959,000,000      
Asset level debt raised         $ 920,000,000      
Australian Data Center Operation [Member]                
Disclosure of detailed information about business combination [line items]                
Proportion of ownership interest in subsidiary           29.00%    
Total consideration           $ 78,000,000    
Equity funded consideration           48,000,000    
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination             11,000,000  
Goodwill expected to be deductible for tax purposes           0    
Cash           78,000,000    
Australian Data Center Operation [Member] | Consortium                
Disclosure of detailed information about business combination [line items]                
Total consideration           272,000,000    
Equity funded consideration           $ 166,000,000    
Western Canadian Natural Gas Gathering and Processing Operation [Member]                
Disclosure of detailed information about business combination [line items]                
Proportion of ownership interest in subsidiary 29.00%              
Total consideration $ 377,000,000 $ 377,000,000         377,000,000  
Equity funded consideration 246,000,000 246,000,000         246,000,000  
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination             8,000,000  
Cash 377,000,000 377,000,000         377,000,000  
Western Canadian Natural Gas Gathering and Processing Operation [Member] | Consortium                
Disclosure of detailed information about business combination [line items]                
Total consideration 1,300,000,000 1,300,000,000         1,300,000,000  
Equity funded consideration $ 861,000,000 861,000,000         861,000,000  
North American Rail Operation                
Disclosure of detailed information about business combination [line items]                
Proportion of ownership interest in subsidiary     9.00%          
Total consideration     $ 602,000,000          
Equity funded consideration     502,000,000          
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination             38,000,000  
Goodwill expected to be deductible for tax purposes     0          
Cash     602,000,000          
North American Rail Operation | Consortium                
Disclosure of detailed information about business combination [line items]                
Total consideration     6,500,000,000          
Equity funded consideration     $ 5,400,000,000          
U.K. Telecommunications [Member]                
Disclosure of detailed information about business combination [line items]                
Proportion of ownership interest in subsidiary       25.00%        
Total consideration       $ 141,000,000        
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination             $ 6,000,000  
Cash       73,000,000        
Increase through business combinations, deferred tax liability   $ 25,000,000            
Deferred consideration, acquisition-date fair value       68,000,000        
U.K. Telecommunications [Member] | Consortium                
Disclosure of detailed information about business combination [line items]                
Total consideration       564,000,000        
Cash       293,000,000        
Deferred consideration, acquisition-date fair value       $ 270,000,000        
Aggregated individually immaterial business combinations                
Disclosure of detailed information about business combination [line items]                
Total consideration               $ 54,000,000
Cash               $ 24,000,000