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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($)
 12 Months Ended
Aug. 31, 2020
Jul. 15, 2020
Dec. 31, 2019
Dec. 31, 2019
Dec. 30, 2019
Dec. 19, 2019
Mar. 22, 2019
Jan. 04, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Disclosure of detailed information about business combination [line items]                        
Revenues                 $ 8,885,000,000 $ 6,597,000,000 $ 4,652,000,000  
Net income (loss)                 904,000,000 650,000,000 $ 806,000,000  
Percentage of voting interest in company                       75.00%
Deferred tax liability                 (179,000,000) 1,024,000,000    
Indian telecom towers operation                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary 17.00%                      
Consideration transferred $ 584,000,000                      
Acquisition costs recorded 15,000,000                      
Revenues                 360,000,000      
Net income (loss)                 8,000,000      
Cash 584,000,000                      
Pro forma revenue                 9,600,000,000      
Pro forma net income                 $ 900,000,000      
Indian telecom towers operation | Consortium                        
Disclosure of detailed information about business combination [line items]                        
Consideration transferred $ 3,400,000,000                      
Columbian Regulated Distribution Operation                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary   6.00%                    
Consideration transferred   $ 45,000,000                    
Percentage of voting interest in company   21.00%                    
Equity funded consideration   $ 25,000,000                    
Loss recognized as a result of partial acquisition   $ 10,000,000                    
Columbian Regulated Distribution Operation | Consortium                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary   20.00%                    
Consideration transferred   $ 150,000,000                    
Equity funded consideration   $ 90,000,000                    
Western Canadian natural gas midstream business                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary     29.00%                  
Consideration transferred     $ 377,000,000 $ 377,000,000           377,000,000    
Acquisition costs recorded                   8,000,000    
Equity funded consideration     246,000,000 246,000,000           246,000,000    
Cash     377,000,000 377,000,000           377,000,000    
Western Canadian natural gas midstream business | Consortium                        
Disclosure of detailed information about business combination [line items]                        
Consideration transferred     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 Business                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary         9.00%              
Consideration transferred         $ 602,000,000              
Acquisition costs recorded                   38,000,000    
Equity funded consideration         502,000,000              
Goodwill expected to be deductible for tax purposes         0              
Cash         602,000,000              
North American Rail Business | Consortium                        
Disclosure of detailed information about business combination [line items]                        
Consideration transferred         6,500,000,000              
Equity funded consideration         $ 5,400,000,000              
U.K. Telecommunications                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary           25.00%            
Consideration transferred           $ 141,000,000            
Acquisition costs recorded                   6,000,000    
Cash           73,000,000            
Deferred consideration           $ 68,000,000            
Period of payable from close of transaction           2 years            
Deferred tax liability       $ 25,000,000                
U.K. Telecommunications | Consortium                        
Disclosure of detailed information about business combination [line items]                        
Consideration transferred           $ 564,000,000            
Cash           293,000,000            
Deferred consideration           $ 270,000,000            
Indian gas transmission operation                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary             24.00%          
Consideration transferred             $ 443,000,000          
Acquisition costs recorded                   3,000,000    
Equity funded consideration             226,000,000          
Cash             443,000,000          
Asset level debt raised             217,000,000          
Indian gas transmission operation | Consortium                        
Disclosure of detailed information about business combination [line items]                        
Consideration transferred             1,879,000,000          
Equity funded consideration             959,000,000          
Asset level debt raised             $ 920,000,000          
Australian data center operation                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in subsidiary               29.00%        
Consideration transferred               $ 78,000,000        
Acquisition costs recorded                   $ 11,000,000    
Equity funded consideration               48,000,000        
Goodwill expected to be deductible for tax purposes               0        
Cash               78,000,000        
Australian data center operation | Consortium                        
Disclosure of detailed information about business combination [line items]                        
Consideration transferred               272,000,000        
Equity funded consideration               $ 166,000,000