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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 07, 2020
Disclosure of subsidiaries [line items]        
Revenues $ 8,885 $ 6,597 $ 4,652  
Net income (loss) attributable to partnership 394 233 410  
Non-Wholly Owned Subsidiaries        
Disclosure of subsidiaries [line items]        
Revenues 8,631 6,279 4,301  
Attributable to non-controlling interest, Net Income (loss) 511 412 397  
Attributable to non-controlling interest, Other Comprehensive Income (loss) (130) 241 (657)  
Net income (loss) attributable to partnership 237 (6) 385  
Attributable to unitholders, Other Comprehensive Income (loss) 364 364 (114)  
U.K. regulated distribution operation        
Disclosure of subsidiaries [line items]        
Revenues 488 478 449  
Attributable to non-controlling interest, Net Income (loss) 11 24 22  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 42 71 19  
Net income (loss) attributable to partnership 46 103 99  
Attributable to unitholders, Other Comprehensive Income (loss) 167 278 86  
Colombian regulated distribution operation        
Disclosure of subsidiaries [line items]        
Revenues 6 179 177  
Attributable to non-controlling interest, Net Income (loss) 2 10 15  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 156 (9) (11)  
Net income (loss) attributable to partnership 0 2 3  
Attributable to unitholders, Other Comprehensive Income (loss) (6) (2) (2)  
Brazilian regulated gas transmission operation        
Disclosure of subsidiaries [line items]        
Revenues 942 1,141 1,112  
Attributable to non-controlling interest, Net Income (loss) 309 349 357  
Attributable to non-controlling interest, Other Comprehensive Income (loss) (399) (83) (469)  
Net income (loss) attributable to partnership 116 132 139  
Attributable to unitholders, Other Comprehensive Income (loss) (152) (33) (190)  
Colombian natural gas distribution operation        
Disclosure of subsidiaries [line items]        
Revenues 793 874 516  
Attributable to non-controlling interest, Net Income (loss) 39 51 34  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 34 (4) (91)  
Net income (loss) attributable to partnership 7 7 7  
Attributable to unitholders, Other Comprehensive Income (loss) 13 0 (14)  
Brazilian electricity transmission operation        
Disclosure of subsidiaries [line items]        
Revenues 40 2    
Attributable to non-controlling interest, Net Income (loss) 9 15    
Attributable to non-controlling interest, Other Comprehensive Income (loss) (25) (2)    
Net income (loss) attributable to partnership 4 7    
Attributable to unitholders, Other Comprehensive Income (loss) (11) (1)    
Canadian district energy operation        
Disclosure of subsidiaries [line items]        
Revenues 127 121 118  
Attributable to non-controlling interest, Net Income (loss) 5 6 7  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 115 85 32  
Net income (loss) attributable to partnership 2 2 3  
Attributable to unitholders, Other Comprehensive Income (loss) 39 29 11  
U.S. district energy operation        
Disclosure of subsidiaries [line items]        
Revenues 137 158 149  
Attributable to non-controlling interest, Net Income (loss) (14) (14) (13)  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 58 49 35  
Net income (loss) attributable to partnership (9) (9) (8)  
Attributable to unitholders, Other Comprehensive Income (loss) 38 32 23  
North American residential energy infrastructure operation        
Disclosure of subsidiaries [line items]        
Revenues 1,274 956 191  
Attributable to non-controlling interest, Net Income (loss) 70 3 4  
Attributable to non-controlling interest, Other Comprehensive Income (loss) (32) 63 (73)  
Net income (loss) attributable to partnership 29 2 1  
Attributable to unitholders, Other Comprehensive Income (loss) (14) 26 (30)  
Indian gas transmission operation        
Disclosure of subsidiaries [line items]        
Revenues 268 266    
Attributable to non-controlling interest, Net Income (loss) (61) (39)    
Attributable to non-controlling interest, Other Comprehensive Income (loss) (23) (33)    
Net income (loss) attributable to partnership (19) (12)    
Attributable to unitholders, Other Comprehensive Income (loss) (7) (10)    
Australian export terminal        
Disclosure of subsidiaries [line items]        
Revenues 297 308 307  
Attributable to non-controlling interest, Net Income (loss) 163 15 14  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 35 (3) (6)  
Net income (loss) attributable to partnership 54 43 34  
Attributable to unitholders, Other Comprehensive Income (loss) 16 (8) (16)  
Disposal of ownership interest, percentage       22.00%
North American rail operation        
Disclosure of subsidiaries [line items]        
Revenues 1,974 0    
Attributable to non-controlling interest, Net Income (loss) 86 0    
Attributable to non-controlling interest, Other Comprehensive Income (loss) (153) (10)    
Net income (loss) attributable to partnership 11 0    
Attributable to unitholders, Other Comprehensive Income (loss) (16) (1)    
U.K. ports operation        
Disclosure of subsidiaries [line items]        
Revenues 235 197 205  
Attributable to non-controlling interest, Net Income (loss) 22 4 12  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 16 19 3  
Net income (loss) attributable to partnership 31 7 19  
Attributable to unitholders, Other Comprehensive Income (loss) 22 27 4  
Australian port operation        
Disclosure of subsidiaries [line items]        
Revenues 381 462 522  
Attributable to non-controlling interest, Net Income (loss) (29) (24) (6)  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 40 (1) (33)  
Net income (loss) attributable to partnership (10) (7) (3)  
Attributable to unitholders, Other Comprehensive Income (loss) 14 0 (11)  
Chilean toll roads        
Disclosure of subsidiaries [line items]        
Revenues 116 162 168  
Attributable to non-controlling interest, Net Income (loss) (21) 0 (1)  
Attributable to non-controlling interest, Other Comprehensive Income (loss) (21) 27 (7)  
Net income (loss) attributable to partnership (6) 2 (1)  
Attributable to unitholders, Other Comprehensive Income (loss) 2 16 (7)  
Peruvian toll roads        
Disclosure of subsidiaries [line items]        
Revenues 81 107 92  
Attributable to non-controlling interest, Net Income (loss) 7 5 3  
Attributable to non-controlling interest, Other Comprehensive Income (loss) (54) 10 (25)  
Net income (loss) attributable to partnership 1 1 1  
Attributable to unitholders, Other Comprehensive Income (loss) (11) 2 (5)  
Indian toll roads        
Disclosure of subsidiaries [line items]        
Revenues 111 130 61  
Attributable to non-controlling interest, Net Income (loss) (24) (19) (12)  
Attributable to non-controlling interest, Other Comprehensive Income (loss) (4) (6) 2  
Net income (loss) attributable to partnership (8) (9) (6)  
Attributable to unitholders, Other Comprehensive Income (loss) (2) (3) (1)  
North American gas storage operation        
Disclosure of subsidiaries [line items]        
Revenues 143 143 150  
Attributable to non-controlling interest, Net Income (loss) (10) 12 (16)  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 10 52 22  
Net income (loss) attributable to partnership (7) 9 (12)  
Attributable to unitholders, Other Comprehensive Income (loss) 6 32 15  
Western Canadian natural gas gathering and processing operation        
Disclosure of subsidiaries [line items]        
Revenues 501 256 61  
Attributable to non-controlling interest, Net Income (loss) 29 35 3  
Attributable to non-controlling interest, Other Comprehensive Income (loss) (1) 31 (53)  
Net income (loss) attributable to partnership 12 14 1  
Attributable to unitholders, Other Comprehensive Income (loss) (1) 12 (21)  
U.S. data center operation        
Disclosure of subsidiaries [line items]        
Revenues 273 294 0  
Attributable to non-controlling interest, Net Income (loss) (32) (22) 0  
Attributable to non-controlling interest, Other Comprehensive Income (loss) (10) (10) (1)  
Net income (loss) attributable to partnership (13) (7) 0  
Attributable to unitholders, Other Comprehensive Income (loss) (4) (4) 0  
Australian Data Center Operation        
Disclosure of subsidiaries [line items]        
Revenues 24 20    
Attributable to non-controlling interest, Net Income (loss) 4 6    
Attributable to non-controlling interest, Other Comprehensive Income (loss) 12 (3)    
Net income (loss) attributable to partnership 1 2    
Attributable to unitholders, Other Comprehensive Income (loss) 5 (1)    
U.K. telecom towers operation        
Disclosure of subsidiaries [line items]        
Revenues 51 0    
Attributable to non-controlling interest, Net Income (loss) (3) 0    
Attributable to non-controlling interest, Other Comprehensive Income (loss) 5 (2)    
Net income (loss) attributable to partnership (1) 0    
Attributable to unitholders, Other Comprehensive Income (loss) 2 (1)    
Indian telecom towers operation        
Disclosure of subsidiaries [line items]        
Revenues 360      
Attributable to non-controlling interest, Net Income (loss) 5      
Attributable to non-controlling interest, Other Comprehensive Income (loss) 69      
Net income (loss) attributable to partnership 3      
Attributable to unitholders, Other Comprehensive Income (loss) 14      
Holding LP and other        
Disclosure of subsidiaries [line items]        
Revenues 9 25 23  
Attributable to non-controlling interest, Net Income (loss) (56) (5) (26)  
Attributable to non-controlling interest, Other Comprehensive Income (loss) 0 0 (1)  
Net income (loss) attributable to partnership (7) (295) 108  
Attributable to unitholders, Other Comprehensive Income (loss) $ 250 $ (26) $ 44  
Colombian regulated distribution operation        
Disclosure of subsidiaries [line items]        
Disposal of ownership interest, percentage 17.00%