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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of subsidiaries [line items]      
Current Assets $ 3,711 $ 5,841  
Non-Current Assets 57,620 50,467  
Current Liabilities 5,524 5,439  
Non-Current Liabilities 34,134 28,692  
Disposal of investments in associates and joint ventures 0 135 $ 1,289
Non-Wholly Owned Subsidiaries      
Disclosure of subsidiaries [line items]      
Current Assets 3,613 5,723  
Non-Current Assets 49,913 43,406  
Current Liabilities 5,317 5,265  
Non-Current Liabilities 32,480 27,184  
Non-Controlling Interest in Operating Subsidiaries 13,955 14,113  
Partnership Capital 1,774 2,567  
U.K. regulated distribution operation      
Disclosure of subsidiaries [line items]      
Current Assets 181 159  
Non-Current Assets 5,264 4,653  
Current Liabilities 333 294  
Non-Current Liabilities 3,241 2,888  
Non-Controlling Interest in Operating Subsidiaries 367 318  
Partnership Capital 1,504 1,312  
Brazilian regulated gas transmission operation      
Disclosure of subsidiaries [line items]      
Current Assets 405 435  
Non-Current Assets 3,494 4,606  
Current Liabilities 203 199  
Non-Current Liabilities 2,772 3,195  
Non-Controlling Interest in Operating Subsidiaries 783 1,305  
Partnership Capital 141 342  
Colombian natural gas distribution operation      
Disclosure of subsidiaries [line items]      
Current Assets 220 214  
Non-Current Assets 1,256 1,166  
Current Liabilities 248 299  
Non-Current Liabilities 478 314  
Non-Controlling Interest in Operating Subsidiaries 636 684  
Partnership Capital 114 83  
Brazilian electricity transmission operation      
Disclosure of subsidiaries [line items]      
Current Assets 15 21  
Non-Current Assets 320 401  
Current Liabilities 11 12  
Non-Current Liabilities 196 252  
Non-Controlling Interest in Operating Subsidiaries 89 110  
Partnership Capital 39 48  
Canadian district energy operation      
Disclosure of subsidiaries [line items]      
Current Assets 28 29  
Non-Current Assets 1,260 974  
Current Liabilities 147 47  
Non-Current Liabilities 567 506  
Non-Controlling Interest in Operating Subsidiaries 429 337  
Partnership Capital 145 113  
U.S. district energy operation      
Disclosure of subsidiaries [line items]      
Current Assets 38 37  
Non-Current Assets 1,097 964  
Current Liabilities 78 41  
Non-Current Liabilities 768 747  
Non-Controlling Interest in Operating Subsidiaries 163 118  
Partnership Capital 126 95  
North American residential energy infrastructure operation      
Disclosure of subsidiaries [line items]      
Current Assets 210 171  
Non-Current Assets 4,215 3,997  
Current Liabilities 436 337  
Non-Current Liabilities 2,321 1,925  
Non-Controlling Interest in Operating Subsidiaries 1,174 1,341  
Partnership Capital 494 565  
Indian gas transmission operation      
Disclosure of subsidiaries [line items]      
Current Assets 94 155  
Non-Current Assets 2,172 2,272  
Current Liabilities 131 181  
Non-Current Liabilities 1,308 910  
Non-Controlling Interest in Operating Subsidiaries 781 1,157  
Partnership Capital 46 179  
Australian export terminal      
Disclosure of subsidiaries [line items]      
Current Assets   139  
Non-Current Assets   1,994  
Current Liabilities   347  
Non-Current Liabilities   1,688  
Non-Controlling Interest in Operating Subsidiaries   34  
Partnership Capital   64  
North American rail operation      
Disclosure of subsidiaries [line items]      
Current Assets 504 2,150  
Non-Current Assets 9,569 9,392  
Current Liabilities 699 1,409  
Non-Current Liabilities 4,898 4,889  
Non-Controlling Interest in Operating Subsidiaries 4,032 4,747  
Partnership Capital 444 497  
U.K. ports operation      
Disclosure of subsidiaries [line items]      
Current Assets 62 47  
Non-Current Assets 1,105 934  
Current Liabilities 45 78  
Non-Current Liabilities 735 370  
Non-Controlling Interest in Operating Subsidiaries 157 218  
Partnership Capital 230 315  
Australian port operation      
Disclosure of subsidiaries [line items]      
Current Assets 151 126  
Non-Current Assets 863 927  
Current Liabilities 131 124  
Non-Current Liabilities 393 488  
Non-Controlling Interest in Operating Subsidiaries 352 317  
Partnership Capital 138 124  
Chilean toll roads      
Disclosure of subsidiaries [line items]      
Current Assets 126 95  
Non-Current Assets 835 821  
Current Liabilities 125 67  
Non-Current Liabilities 1,148 1,112  
Non-Controlling Interest in Operating Subsidiaries (335) (320)  
Partnership Capital 23 57  
Peruvian toll roads      
Disclosure of subsidiaries [line items]      
Current Assets 105 122  
Non-Current Assets 1,247 1,337  
Current Liabilities 438 19  
Non-Current Liabilities 212 683  
Non-Controlling Interest in Operating Subsidiaries 591 638  
Partnership Capital 111 119  
Indian toll roads      
Disclosure of subsidiaries [line items]      
Current Assets 87 75  
Non-Current Assets 808 868  
Current Liabilities 177 83  
Non-Current Liabilities 426 570  
Non-Controlling Interest in Operating Subsidiaries 203 203  
Partnership Capital 89 87  
North American gas storage operation      
Disclosure of subsidiaries [line items]      
Current Assets 170 200  
Non-Current Assets 1,433 1,449  
Current Liabilities 67 112  
Non-Current Liabilities 658 661  
Non-Controlling Interest in Operating Subsidiaries 544 543  
Partnership Capital 334 333  
Western Canadian natural gas gathering and processing operation      
Disclosure of subsidiaries [line items]      
Current Assets 125 119  
Non-Current Assets 3,964 3,721  
Current Liabilities 131 147  
Non-Current Liabilities 2,072 1,845  
Non-Controlling Interest in Operating Subsidiaries 1,348 1,320  
Partnership Capital 538 528  
U.S. data center operation      
Disclosure of subsidiaries [line items]      
Current Assets 67 105  
Non-Current Assets 1,634 1,665  
Current Liabilities 95 112  
Non-Current Liabilities 1,138 1,130  
Non-Controlling Interest in Operating Subsidiaries 334 376  
Partnership Capital 134 152  
Australian Data Center Operation      
Disclosure of subsidiaries [line items]      
Current Assets 12 10  
Non-Current Assets 311 280  
Current Liabilities 127 5  
Non-Current Liabilities 7 112  
Non-Controlling Interest in Operating Subsidiaries 135 124  
Partnership Capital 54 49  
U.K. telecom towers operation      
Disclosure of subsidiaries [line items]      
Current Assets 32 26  
Non-Current Assets 896 874  
Current Liabilities 332 190  
Non-Current Liabilities 327 419  
Non-Controlling Interest in Operating Subsidiaries 203 219  
Partnership Capital 66 72  
Indian telecom towers operation      
Disclosure of subsidiaries [line items]      
Current Assets 392    
Non-Current Assets 7,998    
Current Liabilities 493    
Non-Current Liabilities 5,392    
Non-Controlling Interest in Operating Subsidiaries 1,917    
Partnership Capital 588    
Holding LP and other      
Disclosure of subsidiaries [line items]      
Current Assets 589 529  
Non-Current Assets 172 111  
Current Liabilities 870 735  
Non-Current Liabilities 3,423 2,480  
Non-Controlling Interest in Operating Subsidiaries 52 50  
Partnership Capital $ (3,584) (2,625)  
Colombian regulated distribution operation      
Disclosure of subsidiaries [line items]      
Current Assets   759  
Non-Current Assets   0  
Current Liabilities   427  
Non-Current Liabilities   0  
Non-Controlling Interest in Operating Subsidiaries   274  
Partnership Capital   $ 58