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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of subsidiaries [line items]    
Current Assets $ 4,896 $ 3,711
Non-Current Assets 69,065 57,620
Current Liabilities 8,661 5,524
Non-Current Liabilities 38,909 34,134
Non-Wholly Owned Subsidiaries    
Disclosure of subsidiaries [line items]    
Current Assets 4,741 3,613
Non-Current Assets 62,026 49,913
Current Liabilities 8,386 5,317
Non-Current Liabilities 37,451 32,480
Non-Controlling Interest in Operating Subsidiaries 15,658 13,955
Partnership capital 5,272 1,774
U.K. regulated distribution operation    
Disclosure of subsidiaries [line items]    
Current Assets 249 181
Non-Current Assets 4,961 5,264
Current Liabilities 316 333
Non-Current Liabilities 3,285 3,241
Non-Controlling Interest in Operating Subsidiaries 314 367
Partnership capital 1,295 1,504
Brazilian regulated gas transmission operation    
Disclosure of subsidiaries [line items]    
Current Assets 668 405
Non-Current Assets 3,115 3,494
Current Liabilities 1,278 203
Non-Current Liabilities 2,028 2,772
Non-Controlling Interest in Operating Subsidiaries 389 783
Partnership capital 88 141
Colombian natural gas distribution operation    
Disclosure of subsidiaries [line items]    
Current Assets 219 220
Non-Current Assets 1,061 1,256
Current Liabilities 162 248
Non-Current Liabilities 522 478
Non-Controlling Interest in Operating Subsidiaries 512 636
Partnership capital 84 114
Brazil electricity transmission operation    
Disclosure of subsidiaries [line items]    
Current Assets 104 15
Non-Current Assets 1,457 320
Current Liabilities 30 11
Non-Current Liabilities 902 196
Non-Controlling Interest in Operating Subsidiaries 436 89
Partnership capital 193 39
Canadian District Energy Operation    
Disclosure of subsidiaries [line items]    
Current Assets   28
Non-Current Assets   1,260
Current Liabilities   147
Non-Current Liabilities   567
Non-Controlling Interest in Operating Subsidiaries   429
Partnership capital   145
U.S. district energy operation    
Disclosure of subsidiaries [line items]    
Current Assets   38
Non-Current Assets   1,097
Current Liabilities   78
Non-Current Liabilities   768
Non-Controlling Interest in Operating Subsidiaries   163
Partnership capital   126
North American residential energy infrastructure operation    
Disclosure of subsidiaries [line items]    
Current Assets 269 210
Non-Current Assets 4,583 4,215
Current Liabilities 466 436
Non-Current Liabilities 2,660 2,321
Non-Controlling Interest in Operating Subsidiaries 1,215 1,174
Partnership capital 511 494
Indian gas transmission operation    
Disclosure of subsidiaries [line items]    
Current Assets 154 94
Non-Current Assets 2,015 2,172
Current Liabilities 287 131
Non-Current Liabilities 1,191 1,308
Non-Controlling Interest in Operating Subsidiaries 644 781
Partnership capital 47 46
UK Residential Infrastructure Business    
Disclosure of subsidiaries [line items]    
Current Assets 5  
Non-Current Assets 151  
Current Liabilities 34  
Non-Current Liabilities 5  
Non-Controlling Interest in Operating Subsidiaries 99  
Partnership capital 18  
European Residential Infrastructure Operation    
Disclosure of subsidiaries [line items]    
Current Assets 24  
Non-Current Assets 213  
Current Liabilities 10  
Non-Current Liabilities 78  
Non-Controlling Interest in Operating Subsidiaries 132  
Partnership capital 17  
North American rail operation    
Disclosure of subsidiaries [line items]    
Current Assets 564 504
Non-Current Assets 9,561 9,569
Current Liabilities 564 699
Non-Current Liabilities 4,930 4,898
Non-Controlling Interest in Operating Subsidiaries 4,173 4,032
Partnership capital 458 444
U.K. ports operation    
Disclosure of subsidiaries [line items]    
Current Assets 55 62
Non-Current Assets 1,154 1,105
Current Liabilities 40 45
Non-Current Liabilities 779 735
Non-Controlling Interest in Operating Subsidiaries 159 157
Partnership capital 231 230
Australian port operation    
Disclosure of subsidiaries [line items]    
Current Assets 262 151
Non-Current Assets 581 863
Current Liabilities 223 131
Non-Current Liabilities 180 393
Non-Controlling Interest in Operating Subsidiaries 316 352
Partnership capital 124 138
Chilean toll roads    
Disclosure of subsidiaries [line items]    
Current Assets   126
Non-Current Assets   835
Current Liabilities   125
Non-Current Liabilities   1,148
Non-Controlling Interest in Operating Subsidiaries   (335)
Partnership capital   23
Peruvian toll roads    
Disclosure of subsidiaries [line items]    
Current Assets 98 105
Non-Current Assets 1,132 1,247
Current Liabilities 17 438
Non-Current Liabilities 561 212
Non-Controlling Interest in Operating Subsidiaries 541 591
Partnership capital 111 111
Indian Toll Roads    
Disclosure of subsidiaries [line items]    
Current Assets 70 87
Non-Current Assets 732 808
Current Liabilities 166 177
Non-Current Liabilities 364 426
Non-Controlling Interest in Operating Subsidiaries 189 203
Partnership capital 83 89
North American gas storage operation    
Disclosure of subsidiaries [line items]    
Current Assets 258 170
Non-Current Assets 1,479 1,433
Current Liabilities 227 67
Non-Current Liabilities 662 658
Non-Controlling Interest in Operating Subsidiaries 525 544
Partnership capital 323 334
Canadian diversified midstream operation    
Disclosure of subsidiaries [line items]    
Current Assets 441  
Non-Current Assets 15,034  
Current Liabilities 2,875  
Non-Current Liabilities 7,283  
Non-Controlling Interest in Operating Subsidiaries 2,413  
Partnership capital 2,904  
Western Canadian natural gas gathering and processing operation    
Disclosure of subsidiaries [line items]    
Current Assets 130 125
Non-Current Assets 3,932 3,964
Current Liabilities 96 131
Non-Current Liabilities 1,974 2,072
Non-Controlling Interest in Operating Subsidiaries 1,422 1,348
Partnership capital 570 538
U.S. data center operation    
Disclosure of subsidiaries [line items]    
Current Assets 51 67
Non-Current Assets 1,401 1,634
Current Liabilities 86 95
Non-Current Liabilities 929 1,138
Non-Controlling Interest in Operating Subsidiaries 312 334
Partnership capital 125 134
Australian data center operation    
Disclosure of subsidiaries [line items]    
Current Assets 28 12
Non-Current Assets 402 311
Current Liabilities 23 127
Non-Current Liabilities 119 7
Non-Controlling Interest in Operating Subsidiaries 206 135
Partnership capital 82 54
U.K. telecom towers operation    
Disclosure of subsidiaries [line items]    
Current Assets 40 32
Non-Current Assets 880 896
Current Liabilities 190 332
Non-Current Liabilities 495 327
Non-Controlling Interest in Operating Subsidiaries 177 203
Partnership capital 58 66
Indian Telecom Towers Operation    
Disclosure of subsidiaries [line items]    
Current Assets 306 392
Non-Current Assets 8,081 7,998
Current Liabilities 407 493
Non-Current Liabilities 6,034 5,392
Non-Controlling Interest in Operating Subsidiaries 1,443 1,917
Partnership capital 503 588
Holding LP and other    
Disclosure of subsidiaries [line items]    
Current Assets 746 589
Non-Current Assets 101 172
Current Liabilities 889 870
Non-Current Liabilities 2,470 3,423
Non-Controlling Interest in Operating Subsidiaries 41 52
Partnership capital $ (2,553) $ (3,584)