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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 30, 2019
Dec. 19, 2019
Mar. 22, 2019
Jan. 04, 2019
Dec. 31, 2018
Nov. 05, 2018
Oct. 16, 2018
Oct. 01, 2018
Sep. 07, 2018
Jun. 01, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about business combination [line items]                                      
Revenues                               $ 6,597,000,000   $ 4,652,000,000 $ 3,535,000,000
Net income (loss)                               650,000,000   806,000,000 574,000,000
Deferred tax liability                               1,024,000,000   694,000,000  
Unit issuance                               809,000,000   588,000,000 $ 1,212,000,000
Goodwill $ 6,553,000,000 $ 6,553,000,000 $ 6,553,000,000         $ 3,859,000,000             $ 6,553,000,000 6,553,000,000 $ 6,553,000,000 3,859,000,000  
Western Canadian natural gas midstream business                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest in subsidiary     29.00%               29.00%                
Consideration transferred 377,000,000 377,000,000 $ 377,000,000               $ 559,000,000       377,000,000 377,000,000 377,000,000    
Equity funded consideration 246,000,000 246,000,000 246,000,000               281,000,000       246,000,000 246,000,000 246,000,000    
Acquisition costs recorded                               8,000,000   3,000,000  
Revenues     0                                
Net income (loss)     0                                
Goodwill expected to be deductible for tax purposes                     0                
Cash 377,000,000 377,000,000 377,000,000               559,000,000       377,000,000 377,000,000 377,000,000    
Asset level debt raised                     278,000,000                
Goodwill 218,000,000 218,000,000 218,000,000               524,000,000       218,000,000 218,000,000 218,000,000    
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               2,000,000,000       1,300,000,000 1,300,000,000 1,300,000,000    
Equity funded consideration 861,000,000 861,000,000 $ 861,000,000               982,000,000       861,000,000 861,000,000 861,000,000    
Asset level debt raised                     $ 974,000,000                
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                              
Equity funded consideration       502,000,000                              
Acquisition costs recorded                               38,000,000      
Revenues   0                                  
Net income (loss)   $ 0                                  
Goodwill expected to be deductible for tax purposes       0                              
Cash       602,000,000                              
Goodwill       2,042,000,000                              
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      
Revenues 0                                    
Net income (loss) 0                                    
Cash         73,000,000                            
Deferred consideration         $ 68,000,000                            
Period of payable from close of transaction         2 years                            
Deferred tax liability $ 25,000,000                                    
Goodwill         $ 301,000,000                            
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 natural gas operations                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest in subsidiary           24.00%                          
Consideration transferred           $ 443,000,000                          
Equity funded consideration           226,000,000                          
Acquisition costs recorded                               3,000,000      
Revenues                             266,000,000        
Net income (loss)                             $ (51,000,000)        
Cash           443,000,000                          
Asset level debt raised           217,000,000                          
Indian natural gas operations | 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                        
Equity funded consideration             48,000,000                        
Acquisition costs recorded                               11,000,000      
Revenues                                 20,000,000    
Net income (loss)                                 $ 8,000,000    
Goodwill expected to be deductible for tax purposes             0                        
Cash             78,000,000                        
Goodwill             68,000,000                        
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                        
U.S. data center operation                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest in subsidiary               29.00%                      
Consideration transferred               $ 315,000,000                   315,000,000  
Equity funded consideration               164,000,000                   164,000,000  
Acquisition costs recorded                                   10,000,000  
Cash               315,000,000                   315,000,000  
Asset level debt raised               151,000,000                   151,000,000  
Goodwill               486,000,000                   486,000,000  
U.S. data center operation | Consortium                                      
Disclosure of detailed information about business combination [line items]                                      
Consideration transferred               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                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest in subsidiary                 26.00%                    
Consideration transferred                 $ 5,000,000                    
Acquisition costs recorded                                   1,000,000  
Cash                 3,000,000                    
Contingent consideration, acquisition-date fair value                 2,000,000                    
Rayalseema Expressway Limited | Consortium                                      
Disclosure of detailed information about business combination [line items]                                      
Consideration transferred                 16,000,000                    
Cash                 10,000,000                    
Contingent consideration, acquisition-date fair value                 $ 6,000,000                    
North American residential energy infrastructure operation                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest in subsidiary                   30.00%                  
Consideration transferred                   $ 723,000,000                  
Equity funded consideration                   427,000,000                  
Acquisition costs recorded                                   4,000,000  
Goodwill expected to be deductible for tax purposes                   0                  
Cash                   491,000,000                  
Asset level debt raised                   64,000,000                  
Goodwill                   1,260,000,000                  
North American residential energy infrastructure operation | Consortium                                      
Disclosure of detailed information about business combination [line items]                                      
Consideration transferred                   2,400,000,000                  
Equity funded consideration                   2,000,000,000                  
Asset level debt raised                   $ 216,000,000                  
Simhapuri Expressway Limited                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest in subsidiary                       29.00%              
Consideration transferred                       $ 53,000,000              
Acquisition costs recorded                                   1,000,000  
Goodwill expected to be deductible for tax purposes                       0              
Cash                       53,000,000              
Deferred tax liability                       23,000,000              
Goodwill                       23,000,000              
Simhapuri Expressway Limited | Consortium                                      
Disclosure of detailed information about business combination [line items]                                      
Consideration transferred                       $ 182,000,000              
Colombian natural gas distribution operation                                      
Disclosure of detailed information about business combination [line items]                                      
Proportion of ownership interest in subsidiary                         16.00%            
Consideration transferred                         $ 150,000,000            
Equity funded consideration                         88,000,000            
Acquisition costs recorded                                   $ 2,000,000  
Goodwill expected to be deductible for tax purposes                         0            
Cash                         118,000,000            
Asset level debt raised                         62,000,000            
Goodwill                         621,000,000            
Pre-existing equity interest, percentage                           3.00%         3.00%
Business combinations, pre-existing interest, equity                         32,000,000 $ 32,000,000         $ 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 natural gas distribution operation | Consortium                                      
Disclosure of detailed information about business combination [line items]                                      
Consideration transferred                         522,000,000            
Equity funded consideration                         309,000,000            
Asset level debt raised                         $ 213,000,000            
North River, G&W, WIG, EWPL and DCI                                      
Disclosure of detailed information about business combination [line items]                                      
Pro forma revenue                               9,200,000,000      
Pro forma net income                               $ 900,000,000      
Non-controlling interest— Exchange LP Units | North American residential energy infrastructure operation                                      
Disclosure of detailed information about business combination [line items]                                      
Exchange LP conversion (in shares)                   0.5509                  
Unit issuance                   $ 232,000,000                  
Issued for cash (in shares)                   5,700,000