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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 14, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]        
Revenues   $ 6,597 $ 4,652 $ 3,535
Net income (loss) attributable to partnership   233 410 125
Disposal of investments in associates and joint ventures   135 1,289 0
Non-Wholly Owned Subsidiaries        
Disclosure of subsidiaries [line items]        
Revenues   6,279 4,301 3,177
Attributable to non-controlling interest, Net Income (loss)   412 397 443
Attributable to non-controlling interest, Other Comprehensive Income (loss)   241 (657) 146
Net income (loss) attributable to partnership   (6) 385 (7)
Attributable to unitholders, Other Comprehensive Income (loss)   364 (114) (210)
U.K. regulated distribution operation        
Disclosure of subsidiaries [line items]        
Revenues   478 449 385
Attributable to non-controlling interest, Net Income (loss)   24 22 21
Attributable to non-controlling interest, Other Comprehensive Income (loss)   71 19 29
Net income (loss) attributable to partnership   103 99 114
Attributable to unitholders, Other Comprehensive Income (loss)   278 86 118
Australian regulated terminal operation        
Disclosure of subsidiaries [line items]        
Revenues   308 307 301
Attributable to non-controlling interest, Net Income (loss)   15 14 15
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (3) (6) 3
Net income (loss) attributable to partnership   43 34 35
Attributable to unitholders, Other Comprehensive Income (loss)   (8) (16) 7
Colombian regulated distribution operation        
Disclosure of subsidiaries [line items]        
Revenues   179 177 161
Attributable to non-controlling interest, Net Income (loss)   10 15 12
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (9) (11) 38
Net income (loss) attributable to partnership   2 3 2
Attributable to unitholders, Other Comprehensive Income (loss)   (2) (2) 7
Brazilian regulated gas transmission operation        
Disclosure of subsidiaries [line items]        
Revenues   1,141 1,112 938
Attributable to non-controlling interest, Net Income (loss)   349 357 349
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (83) (469) (160)
Net income (loss) attributable to partnership   132 139 146
Attributable to unitholders, Other Comprehensive Income (loss)   (33) (190) (72)
Colombian natural gas distribution operation        
Disclosure of subsidiaries [line items]        
Revenues   874 516  
Attributable to non-controlling interest, Net Income (loss)   51 34  
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (4) (91)  
Net income (loss) attributable to partnership   7 7  
Attributable to unitholders, Other Comprehensive Income (loss)   0 (14)  
Brazilian electricity transmission operation        
Disclosure of subsidiaries [line items]        
Revenues   2    
Attributable to non-controlling interest, Net Income (loss)   15    
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (2)    
Net income (loss) attributable to partnership   7    
Attributable to unitholders, Other Comprehensive Income (loss)   (1)    
North American rail operation        
Disclosure of subsidiaries [line items]        
Revenues   0    
Attributable to non-controlling interest, Net Income (loss)   0    
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (10)    
Net income (loss) attributable to partnership   0    
Attributable to unitholders, Other Comprehensive Income (loss)   (1)    
U.K. ports operation        
Disclosure of subsidiaries [line items]        
Revenues   197 205 180
Attributable to non-controlling interest, Net Income (loss)   4 12 8
Attributable to non-controlling interest, Other Comprehensive Income (loss)   19 3 21
Net income (loss) attributable to partnership   7 19 22
Attributable to unitholders, Other Comprehensive Income (loss)   27 4 29
Australian port operation        
Disclosure of subsidiaries [line items]        
Revenues   462 522 501
Attributable to non-controlling interest, Net Income (loss)   (24) (6) (7)
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (1) (33) 28
Net income (loss) attributable to partnership   (7) (3) (3)
Attributable to unitholders, Other Comprehensive Income (loss)   0 (11) 9
Chilean toll roads        
Disclosure of subsidiaries [line items]        
Revenues   162 168 154
Attributable to non-controlling interest, Net Income (loss)   0 (1) 0
Attributable to non-controlling interest, Other Comprehensive Income (loss)   27 (7) 7
Net income (loss) attributable to partnership   2 (1) 0
Attributable to unitholders, Other Comprehensive Income (loss)   16 (7) 8
Peruvian toll roads        
Disclosure of subsidiaries [line items]        
Revenues   107 92 103
Attributable to non-controlling interest, Net Income (loss)   5 3 12
Attributable to non-controlling interest, Other Comprehensive Income (loss)   10 (25) 22
Net income (loss) attributable to partnership   1 1 2
Attributable to unitholders, Other Comprehensive Income (loss)   2 (5) 5
Indian toll roads        
Disclosure of subsidiaries [line items]        
Revenues   130 61 57
Attributable to non-controlling interest, Net Income (loss)   (19) (12) (2)
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (6) 2 4
Net income (loss) attributable to partnership   (9) (6) (1)
Attributable to unitholders, Other Comprehensive Income (loss)   (3) (1) 3
North American gas storage operation        
Disclosure of subsidiaries [line items]        
Revenues   143 150 149
Attributable to non-controlling interest, Net Income (loss)   12 (16) 30
Attributable to non-controlling interest, Other Comprehensive Income (loss)   52 22 74
Net income (loss) attributable to partnership   9 (12) 18
Attributable to unitholders, Other Comprehensive Income (loss)   32 15 47
Canadian district energy operation        
Disclosure of subsidiaries [line items]        
Revenues   121 118 95
Attributable to non-controlling interest, Net Income (loss)   6 7 (2)
Attributable to non-controlling interest, Other Comprehensive Income (loss)   85 32 39
Net income (loss) attributable to partnership   2 3 0
Attributable to unitholders, Other Comprehensive Income (loss)   29 11 13
U.S. district energy operation        
Disclosure of subsidiaries [line items]        
Revenues   158 149 131
Attributable to non-controlling interest, Net Income (loss)   (14) (13) 10
Attributable to non-controlling interest, Other Comprehensive Income (loss)   49 35 40
Net income (loss) attributable to partnership   (9) (8) 7
Attributable to unitholders, Other Comprehensive Income (loss)   32 23 26
Western Canadian natural gas gathering and processing operation        
Disclosure of subsidiaries [line items]        
Revenues   256 61  
Attributable to non-controlling interest, Net Income (loss)   35 3  
Attributable to non-controlling interest, Other Comprehensive Income (loss)   31 (53)  
Net income (loss) attributable to partnership   14 1  
Attributable to unitholders, Other Comprehensive Income (loss)   12 (21)  
North American residential energy infrastructure operation        
Disclosure of subsidiaries [line items]        
Revenues   956 191  
Attributable to non-controlling interest, Net Income (loss)   3 4  
Attributable to non-controlling interest, Other Comprehensive Income (loss)   63 (73)  
Net income (loss) attributable to partnership   2 1  
Attributable to unitholders, Other Comprehensive Income (loss)   26 (30)  
Indian natural gas operations        
Disclosure of subsidiaries [line items]        
Revenues   266    
Attributable to non-controlling interest, Net Income (loss)   (39)    
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (33)    
Net income (loss) attributable to partnership   (12)    
Attributable to unitholders, Other Comprehensive Income (loss)   (10)    
U.S. data center operation        
Disclosure of subsidiaries [line items]        
Revenues   294 0  
Attributable to non-controlling interest, Net Income (loss)   (22) 0  
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (10) (1)  
Net income (loss) attributable to partnership   (7) 0  
Attributable to unitholders, Other Comprehensive Income (loss)   (4) 0  
Australian Data Center Operation        
Disclosure of subsidiaries [line items]        
Revenues   20    
Attributable to non-controlling interest, Net Income (loss)   6    
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (3)    
Net income (loss) attributable to partnership   2    
Attributable to unitholders, Other Comprehensive Income (loss)   (1)    
U.K. telecom towers operation        
Disclosure of subsidiaries [line items]        
Revenues   0    
Attributable to non-controlling interest, Net Income (loss)   0    
Attributable to non-controlling interest, Other Comprehensive Income (loss)   (2)    
Net income (loss) attributable to partnership   0    
Attributable to unitholders, Other Comprehensive Income (loss)   (1)    
Holding LP and other        
Disclosure of subsidiaries [line items]        
Revenues   25 23 22
Attributable to non-controlling interest, Net Income (loss)   (5) (26) (3)
Attributable to non-controlling interest, Other Comprehensive Income (loss)   0 (1) 1
Net income (loss) attributable to partnership   (295) 108 (349)
Attributable to unitholders, Other Comprehensive Income (loss)   $ (26) $ 44 $ (410)
Colombian regulated distribution operation | Classification of assets as held for sale        
Disclosure of subsidiaries [line items]        
Ownership and voting Interest 17.00%      
Disposal of investments in associates and joint ventures $ 90