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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 30, 2021
Aug. 31, 2020
Jul. 15, 2020
Jun. 30, 2021
Aggregated individually immaterial business combinations        
Disclosure of detailed information about business combination [line items]        
Total consideration       $ 96
Pro Forma [Member]        
Business Acquisition, Proforma Revenue       5,400
Business Acquisition, Proforma Income       $ 1,700
Indian Telecom Towers Operation        
Disclosure of detailed information about business combination [line items]        
Proportion of ownership interest in subsidiary   17.00%    
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination   $ 15    
Total consideration   584    
Indian Telecom Towers Operation | Consortium        
Disclosure of detailed information about business combination [line items]        
Total consideration   $ 3,400    
Columbian Regulated Distribution Operation        
Disclosure of detailed information about business combination [line items]        
Proportion of ownership interest in subsidiary     6.00%  
Equity funded consideration     $ 25  
Percentage of voting interest in company     21.00%  
Total consideration     $ 45  
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination     $ (10)  
Columbian Regulated Distribution Operation | Consortium        
Disclosure of detailed information about business combination [line items]        
Proportion of ownership interest in subsidiary     20.00%  
Equity funded consideration     $ 90  
Total consideration     $ 150  
Brazilian Regulated Gas Transmission Operation        
Disclosure of detailed information about business combination [line items]        
Proportion of ownership interest in subsidiary 3.00%      
Percentage of voting interest in company 31.00%      
Total consideration $ 87      
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination $ (32)      
Brazilian Regulated Gas Transmission Operation | Consortium        
Disclosure of detailed information about business combination [line items]        
Proportion of ownership interest in subsidiary 10.00%      
Total consideration $ 283