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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 16, 2021
Jun. 07, 2021
Dec. 07, 2020
Disclosure of subsidiaries [line items]            
Revenues $ 11,537 $ 8,885 $ 6,597      
Net income (loss) attributable to partnership 1,093 394 233      
Non-Wholly Owned Subsidiaries            
Disclosure of subsidiaries [line items]            
Revenues 11,233 8,631 6,279      
Attributable to non-controlling interest, net income (loss) 1,626 511 412      
Attributable to non-controlling interest, other comprehensive income (loss) 24 (130) 241      
Net income (loss) attributable to partnership 966 237 (6)      
Attributable to unitholders, other comprehensive income (loss) 257 364 364      
U.K. regulated distribution operation            
Disclosure of subsidiaries [line items]            
Revenues 569 488 478      
Attributable to non-controlling interest, net income (loss) 34 11 24      
Attributable to non-controlling interest, other comprehensive income (loss) 6 42 71      
Net income (loss) attributable to partnership 138 46 103      
Attributable to unitholders, other comprehensive income (loss) 26 167 278      
Colombian regulated distribution operation            
Disclosure of subsidiaries [line items]            
Revenues   6 179      
Attributable to non-controlling interest, net income (loss)   2 10      
Attributable to non-controlling interest, other comprehensive income (loss)   156 (9)      
Net income (loss) attributable to partnership   0 2      
Attributable to unitholders, other comprehensive income (loss)   (6) (2)      
Brazilian regulated gas transmission operation            
Disclosure of subsidiaries [line items]            
Revenues 1,074 942 1,141      
Attributable to non-controlling interest, net income (loss) 361 309 349      
Attributable to non-controlling interest, other comprehensive income (loss) (87) (399) (83)      
Net income (loss) attributable to partnership 150 116 132      
Attributable to unitholders, other comprehensive income (loss) (31) (152) (33)      
Colombian natural gas distribution operation            
Disclosure of subsidiaries [line items]            
Revenues 862 793 874      
Attributable to non-controlling interest, net income (loss) 34 39 51      
Attributable to non-controlling interest, other comprehensive income (loss) (101) 34 (4)      
Net income (loss) attributable to partnership 8 7 7      
Attributable to unitholders, other comprehensive income (loss) (24) 13 0      
Brazil electricity transmission operation            
Disclosure of subsidiaries [line items]            
Revenues 90 40 2      
Attributable to non-controlling interest, net income (loss) 22 9 15      
Attributable to non-controlling interest, other comprehensive income (loss) (6) (25) (2)      
Net income (loss) attributable to partnership 10 4 7      
Attributable to unitholders, other comprehensive income (loss) (2) (11) (1)      
Canadian District Energy Operation            
Disclosure of subsidiaries [line items]            
Revenues 72 127 121      
Attributable to non-controlling interest, net income (loss) 9 5 6      
Attributable to non-controlling interest, other comprehensive income (loss) 35 115 85      
Net income (loss) attributable to partnership 3 2 2      
Attributable to unitholders, other comprehensive income (loss) 8 39 29      
Disposal of ownership interest, percentage         25.00%  
U.S. district energy operation            
Disclosure of subsidiaries [line items]            
Revenues 74 137 158      
Attributable to non-controlling interest, net income (loss) 2 (14) (14)      
Attributable to non-controlling interest, other comprehensive income (loss) 0 58 49      
Net income (loss) attributable to partnership 0 (9) (9)      
Attributable to unitholders, other comprehensive income (loss) 0 38 32      
Disposal of ownership interest, percentage         40.00%  
Australian Export Terminal            
Disclosure of subsidiaries [line items]            
Revenues   297 308      
Attributable to non-controlling interest, net income (loss)   163 15      
Attributable to non-controlling interest, other comprehensive income (loss)   35 (3)      
Net income (loss) attributable to partnership   54 43      
Attributable to unitholders, other comprehensive income (loss)   16 (8)      
Disposal of ownership interest, percentage           22.00%
North American residential energy infrastructure operation            
Disclosure of subsidiaries [line items]            
Revenues 1,444 1,274 956      
Attributable to non-controlling interest, net income (loss) 75 70 3      
Attributable to non-controlling interest, other comprehensive income (loss) 43 (32) 63      
Net income (loss) attributable to partnership 32 29 2      
Attributable to unitholders, other comprehensive income (loss) 18 (14) 26      
Indian gas transmission operation            
Disclosure of subsidiaries [line items]            
Revenues 342 268 266      
Attributable to non-controlling interest, net income (loss) 35 (61) (39)      
Attributable to non-controlling interest, other comprehensive income (loss) (17) (23) (33)      
Net income (loss) attributable to partnership 13 (19) (12)      
Attributable to unitholders, other comprehensive income (loss) (5) (7) (10)      
UK Residential Infrastructure Business            
Disclosure of subsidiaries [line items]            
Revenues 2          
Attributable to non-controlling interest, net income (loss) 0          
Attributable to non-controlling interest, other comprehensive income (loss) 0          
Net income (loss) attributable to partnership 0          
Attributable to unitholders, other comprehensive income (loss) 0          
European Residential Infrastructure Operation            
Disclosure of subsidiaries [line items]            
Revenues 89          
Attributable to non-controlling interest, net income (loss) (6)          
Attributable to non-controlling interest, other comprehensive income (loss) (8)          
Net income (loss) attributable to partnership (1)          
Attributable to unitholders, other comprehensive income (loss) (1)          
North American rail operation            
Disclosure of subsidiaries [line items]            
Revenues 2,157 1,974 0      
Attributable to non-controlling interest, net income (loss) 208 86 0      
Attributable to non-controlling interest, other comprehensive income (loss) 131 (153) (10)      
Net income (loss) attributable to partnership 24 11 0      
Attributable to unitholders, other comprehensive income (loss) 13 (16) (1)      
U.K. ports operation            
Disclosure of subsidiaries [line items]            
Revenues 274 235 197      
Attributable to non-controlling interest, net income (loss) 17 22 4      
Attributable to non-controlling interest, other comprehensive income (loss) 6 16 19      
Net income (loss) attributable to partnership 24 31 7      
Attributable to unitholders, other comprehensive income (loss) 9 22 27      
Australian port operation            
Disclosure of subsidiaries [line items]            
Revenues 412 381 462      
Attributable to non-controlling interest, net income (loss) (16) (29) (24)      
Attributable to non-controlling interest, other comprehensive income (loss) (18) 40 (1)      
Net income (loss) attributable to partnership (6) (10) (7)      
Attributable to unitholders, other comprehensive income (loss) (6) 14 0      
Chilean toll roads            
Disclosure of subsidiaries [line items]            
Revenues 138 116 162      
Attributable to non-controlling interest, net income (loss) (40) (21) 0      
Attributable to non-controlling interest, other comprehensive income (loss) 53 (21) 27      
Net income (loss) attributable to partnership (8) (6) 2      
Attributable to unitholders, other comprehensive income (loss) 13 2 16      
Disposal of ownership interest, percentage       17.00%    
Peruvian toll roads            
Disclosure of subsidiaries [line items]            
Revenues 96 81 107      
Attributable to non-controlling interest, net income (loss) 6 7 5      
Attributable to non-controlling interest, other comprehensive income (loss) (57) (54) 10      
Net income (loss) attributable to partnership 1 1 1      
Attributable to unitholders, other comprehensive income (loss) (11) (11) 2      
Indian Toll Roads            
Disclosure of subsidiaries [line items]            
Revenues 117 111 130      
Attributable to non-controlling interest, net income (loss) (25) (24) (19)      
Attributable to non-controlling interest, other comprehensive income (loss) (6) (4) (6)      
Net income (loss) attributable to partnership (9) (8) (9)      
Attributable to unitholders, other comprehensive income (loss) (3) (2) (3)      
North American gas storage operation            
Disclosure of subsidiaries [line items]            
Revenues 371 143 143      
Attributable to non-controlling interest, net income (loss) 95 (10) 12      
Attributable to non-controlling interest, other comprehensive income (loss) 36 10 52      
Net income (loss) attributable to partnership 65 (7) 9      
Attributable to unitholders, other comprehensive income (loss) 22 6 32      
Canadian diversified midstream operation            
Disclosure of subsidiaries [line items]            
Revenues 906          
Attributable to non-controlling interest, net income (loss) 59          
Attributable to non-controlling interest, other comprehensive income (loss) 38          
Net income (loss) attributable to partnership 65          
Attributable to unitholders, other comprehensive income (loss) 30          
Western Canadian natural gas gathering and processing operation            
Disclosure of subsidiaries [line items]            
Revenues 551 501 256      
Attributable to non-controlling interest, net income (loss) 62 29 35      
Attributable to non-controlling interest, other comprehensive income (loss) 52 (1) 31      
Net income (loss) attributable to partnership 25 12 14      
Attributable to unitholders, other comprehensive income (loss) 21 (1) 12      
U.S. data center operation            
Disclosure of subsidiaries [line items]            
Revenues 249 273 294      
Attributable to non-controlling interest, net income (loss) (33) (32) (22)      
Attributable to non-controlling interest, other comprehensive income (loss) 13 (10) (10)      
Net income (loss) attributable to partnership (13) (13) (7)      
Attributable to unitholders, other comprehensive income (loss) 5 (4) (4)      
Australian data center operation            
Disclosure of subsidiaries [line items]            
Revenues 23 24 20      
Attributable to non-controlling interest, net income (loss) 3 4 6      
Attributable to non-controlling interest, other comprehensive income (loss) (8) 12 (3)      
Net income (loss) attributable to partnership 1 1 2      
Attributable to unitholders, other comprehensive income (loss) (3) 5 (1)      
U.K. telecom towers operation            
Disclosure of subsidiaries [line items]            
Revenues 59 51 0      
Attributable to non-controlling interest, net income (loss) (19) (3) 0      
Attributable to non-controlling interest, other comprehensive income (loss) (1) 5 (2)      
Net income (loss) attributable to partnership (6) (1) 0      
Attributable to unitholders, other comprehensive income (loss) 0 2 (1)      
Indian Telecom Towers Operation            
Disclosure of subsidiaries [line items]            
Revenues 1,257 360        
Attributable to non-controlling interest, net income (loss) 1 5        
Attributable to non-controlling interest, other comprehensive income (loss) (80) 69        
Net income (loss) attributable to partnership 0 3        
Attributable to unitholders, other comprehensive income (loss) (16) 14        
Holding LP and other            
Disclosure of subsidiaries [line items]            
Revenues 5 9 25      
Attributable to non-controlling interest, net income (loss) 742 (56) (5)      
Attributable to non-controlling interest, other comprehensive income (loss) 0 0 0      
Net income (loss) attributable to partnership 450 (7) (295)      
Attributable to unitholders, other comprehensive income (loss) $ 194 $ 250 $ (26)      
Colombian regulated distribution operation            
Disclosure of subsidiaries [line items]            
Disposal of ownership interest, percentage 17.00%