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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($)
 6 Months Ended 12 Months Ended
Mar. 22, 2019
Jan. 04, 2019
Dec. 31, 2018
Nov. 05, 2018
Oct. 16, 2018
Oct. 01, 2018
Sep. 07, 2018
Jun. 01, 2018
Jun. 30, 2019
Dec. 31, 2018
Disclosure of detailed information about business combination [line items]                    
Non-controlling interest, Exchange LP units, equity     $ 71,000,000           $ 21,000,000 $ 71,000,000
Goodwill     $ 3,859,000,000           4,005,000,000 3,859,000,000
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                 2,000,000  
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                
Goodwill   68,000,000                
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                
U.S. Data Center Operation [Member]                    
Disclosure of detailed information about business combination [line items]                    
Proportion of ownership interest in subsidiary     29.00%              
Total consideration     $ 315,000,000             315,000,000
Equity funded consideration     164,000,000             164,000,000
Asset level debt raised     151,000,000             151,000,000
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                   10,000,000
Cash     315,000,000             315,000,000
Goodwill     463,000,000             463,000,000
U.S. Data Center Operation [Member] | Consortium                    
Disclosure of detailed information about business combination [line items]                    
Total consideration     1,103,000,000             1,103,000,000
Equity funded consideration     577,000,000             577,000,000
Asset level debt raised     526,000,000             526,000,000
Equity funded consideration from non-controlling interests     $ 413,000,000             413,000,000
Rayalseema Expressway Limited [Domain]                    
Disclosure of detailed information about business combination [line items]                    
Proportion of ownership interest in subsidiary       26.00%            
Total consideration       $ 5,000,000            
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                   1,000,000
Cash       3,000,000            
Contingent consideration, acquisition-date fair value       2,000,000            
Rayalseema Expressway Limited [Domain] | Consortium                    
Disclosure of detailed information about business combination [line items]                    
Total consideration       16,000,000            
Cash       10,000,000            
Contingent consideration, acquisition-date fair value       $ 6,000,000            
North American Residential Energy Infrastructure Operation [Member]                    
Disclosure of detailed information about business combination [line items]                    
Proportion of ownership interest in subsidiary         30.00%          
Total consideration         $ 723,000,000          
Equity funded consideration         427,000,000          
Asset level debt raised         64,000,000          
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                   4,000,000
Goodwill expected to be deductible for tax purposes         0          
Cash         491,000,000          
Non-controlling interest, Exchange LP units, equity         232,000,000          
Goodwill         $ 1,260,000,000          
North American Residential Energy Infrastructure Operation [Member] | Non-controlling Interest - Exchange LP Units, equity [Member]                    
Disclosure of detailed information about business combination [line items]                    
Exchange LP unit conversion, shares         0.5509          
Exchange LP unit conversion to BIP units, shares         1          
Non-controlling interest, Exchange LP units, equity         $ 232,000,000          
Number Of Shares Issued1         5,700,000          
North American Residential Energy Infrastructure Operation [Member] | Consortium                    
Disclosure of detailed information about business combination [line items]                    
Total consideration         $ 2,400,000,000          
Equity funded consideration         2,000,000,000          
Asset level debt raised         $ 216,000,000          
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           $ 559,000,000        
Equity funded consideration           281,000,000        
Asset level debt raised           278,000,000        
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                   3,000,000
Goodwill expected to be deductible for tax purposes           0        
Cash           559,000,000        
Goodwill           524,000,000        
Western Canadian Natural Gas Gathering and Processing Operation [Member] | Consortium                    
Disclosure of detailed information about business combination [line items]                    
Total consideration           2,000,000,000        
Equity funded consideration           982,000,000        
Asset level debt raised           $ 974,000,000        
Simhapuri Expressway Limited [Domain]                    
Disclosure of detailed information about business combination [line items]                    
Proportion of ownership interest in subsidiary             29.00%      
Total consideration             $ 53,000,000      
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                   1,000,000
Goodwill expected to be deductible for tax purposes             0      
Cash             53,000,000      
Increase through business combinations, deferred tax liability             23,000,000      
Goodwill             23,000,000      
Simhapuri Expressway Limited [Domain] | Consortium                    
Disclosure of detailed information about business combination [line items]                    
Total consideration             $ 182,000,000      
Colombian Gas Distribution Operation [Member]                    
Disclosure of detailed information about business combination [line items]                    
Proportion of ownership interest in subsidiary               16.00%    
Total consideration               $ 150,000,000    
Equity funded consideration               88,000,000    
Asset level debt raised               62,000,000    
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination                   $ 2,000,000
Goodwill expected to be deductible for tax purposes               0    
Cash               118,000,000    
Goodwill               $ 621,000,000    
Pre-existing equity interest, percentage               3.00%    
Business combinations, pre-existing interest, equity               $ 32,000,000    
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination               0    
Colombian Gas Distribution Operation [Member] | Consortium                    
Disclosure of detailed information about business combination [line items]                    
Total consideration               522,000,000    
Equity funded consideration               309,000,000    
Asset level debt raised               $ 213,000,000    
Aggregated individually immaterial business combinations                    
Disclosure of detailed information about business combination [line items]                    
Total consideration                 31,000,000  
Cash                 14,000,000  
Goodwill                 15,000,000  
Business combinations, pre-existing interest, equity                 17,000,000  
Business Acquisition, Pro Forma Revenue                 3,350,000,000  
Business Acquisition, Pro Forma Net Income (Loss)                 $ 425,000,000