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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 14, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]        
Current Assets   $ 5,841 $ 2,276 $ 1,512
Non-Current Assets   50,467 34,304 27,965
Current Liabilities   5,439 2,417 1,564
Non-Current Liabilities   28,692 19,495 14,439
Disposal of investments in associates and joint ventures   135 1,289 $ 0
Non-Wholly Owned Subsidiaries        
Disclosure of subsidiaries [line items]        
Current Assets   5,723 2,188  
Non-Current Assets   43,406 27,349  
Current Liabilities   5,265 2,325  
Non-Current Liabilities   27,184 17,878  
Non-Controlling Interest in Operating Subsidiaries   14,113 7,305  
Partnership Capital   2,567 2,029  
U.K. regulated distribution operation        
Disclosure of subsidiaries [line items]        
Current Assets   159 131  
Non-Current Assets   4,653 3,844  
Current Liabilities   294 248  
Non-Current Liabilities   2,888 2,452  
Non-Controlling Interest in Operating Subsidiaries   318 247  
Partnership Capital   1,312 1,028  
Australian regulated terminal operation        
Disclosure of subsidiaries [line items]        
Current Assets   139 34  
Non-Current Assets   1,994 2,074  
Current Liabilities   347 27  
Non-Current Liabilities   1,688 1,943  
Non-Controlling Interest in Operating Subsidiaries   34 45  
Partnership Capital   64 93  
Colombian regulated distribution operation        
Disclosure of subsidiaries [line items]        
Current Assets   759 51  
Non-Current Assets   0 708  
Current Liabilities   427 32  
Non-Current Liabilities   0 396  
Non-Controlling Interest in Operating Subsidiaries   274 273  
Partnership Capital   58 58  
Brazilian regulated gas transmission operation        
Disclosure of subsidiaries [line items]        
Current Assets   435 310  
Non-Current Assets   4,606 4,955  
Current Liabilities   199 106  
Non-Current Liabilities   3,195 3,185  
Non-Controlling Interest in Operating Subsidiaries   1,305 1,540  
Partnership Capital   342 434  
Colombian natural gas distribution operation        
Disclosure of subsidiaries [line items]        
Current Assets   214 230  
Non-Current Assets   1,166 1,149  
Current Liabilities   299 235  
Non-Current Liabilities   314 374  
Non-Controlling Interest in Operating Subsidiaries   684 691  
Partnership Capital   83 79  
Brazilian electricity transmission operation        
Disclosure of subsidiaries [line items]        
Current Assets   21    
Non-Current Assets   401    
Current Liabilities   12    
Non-Current Liabilities   252    
Non-Controlling Interest in Operating Subsidiaries   110    
Partnership Capital   48    
North American rail operation        
Disclosure of subsidiaries [line items]        
Current Assets   2,150    
Non-Current Assets   9,392    
Current Liabilities   1,409    
Non-Current Liabilities   4,889    
Non-Controlling Interest in Operating Subsidiaries   4,747    
Partnership Capital   497    
U.K. ports operation        
Disclosure of subsidiaries [line items]        
Current Assets   47 48  
Non-Current Assets   934 847  
Current Liabilities   78 71  
Non-Current Liabilities   370 347  
Non-Controlling Interest in Operating Subsidiaries   218 195  
Partnership Capital   315 282  
Australian port operation        
Disclosure of subsidiaries [line items]        
Current Assets   126 141  
Non-Current Assets   927 593  
Current Liabilities   124 239  
Non-Current Liabilities   488 59  
Non-Controlling Interest in Operating Subsidiaries   317 319  
Partnership Capital   124 117  
Chilean toll roads        
Disclosure of subsidiaries [line items]        
Current Assets   95 82  
Non-Current Assets   821 940  
Current Liabilities   67 59  
Non-Current Liabilities   1,112 862  
Non-Controlling Interest in Operating Subsidiaries   (320) 43  
Partnership Capital   57 58  
Peruvian toll roads        
Disclosure of subsidiaries [line items]        
Current Assets   122 104  
Non-Current Assets   1,337 1,308  
Current Liabilities   19 20  
Non-Current Liabilities   683 654  
Non-Controlling Interest in Operating Subsidiaries   638 622  
Partnership Capital   119 116  
Indian toll roads        
Disclosure of subsidiaries [line items]        
Current Assets   75 90  
Non-Current Assets   868 975  
Current Liabilities   83 65  
Non-Current Liabilities   570 667  
Non-Controlling Interest in Operating Subsidiaries   203 229  
Partnership Capital   87 104  
North American gas storage operation        
Disclosure of subsidiaries [line items]        
Current Assets   200 281  
Non-Current Assets   1,449 1,273  
Current Liabilities   112 155  
Non-Current Liabilities   661 566  
Non-Controlling Interest in Operating Subsidiaries   543 515  
Partnership Capital   333 318  
Canadian district energy operation        
Disclosure of subsidiaries [line items]        
Current Assets   29 25  
Non-Current Assets   974 754  
Current Liabilities   47 32  
Non-Current Liabilities   506 387  
Non-Controlling Interest in Operating Subsidiaries   337 269  
Partnership Capital   113 91  
U.S. district energy operation        
Disclosure of subsidiaries [line items]        
Current Assets   37 42  
Non-Current Assets   964 834  
Current Liabilities   41 26  
Non-Current Liabilities   747 681  
Non-Controlling Interest in Operating Subsidiaries   118 90  
Partnership Capital   95 79  
Western Canadian natural gas gathering and processing operation        
Disclosure of subsidiaries [line items]        
Current Assets   119 86  
Non-Current Assets   3,721 2,069  
Current Liabilities   147 84  
Non-Current Liabilities   1,845 1,161  
Non-Controlling Interest in Operating Subsidiaries   1,320 650  
Partnership Capital   528 260  
North American residential energy infrastructure operation        
Disclosure of subsidiaries [line items]        
Current Assets   171 196  
Non-Current Assets   3,997 3,647  
Current Liabilities   337 152  
Non-Current Liabilities   1,925 1,551  
Non-Controlling Interest in Operating Subsidiaries   1,341 1,506  
Partnership Capital   565 634  
Indian natural gas operations        
Disclosure of subsidiaries [line items]        
Current Assets   155    
Non-Current Assets   2,272    
Current Liabilities   181    
Non-Current Liabilities   910    
Non-Controlling Interest in Operating Subsidiaries   1,157    
Partnership Capital   179    
U.S. data center operation        
Disclosure of subsidiaries [line items]        
Current Assets   105 17  
Non-Current Assets   1,665 1,131  
Current Liabilities   112 438  
Non-Current Liabilities   1,130 562  
Non-Controlling Interest in Operating Subsidiaries   376 (12)  
Partnership Capital   152 160  
Australian Data Center Operation        
Disclosure of subsidiaries [line items]        
Current Assets   10    
Non-Current Assets   280    
Current Liabilities   5    
Non-Current Liabilities   112    
Non-Controlling Interest in Operating Subsidiaries   124    
Partnership Capital   49    
U.K. telecom towers operation        
Disclosure of subsidiaries [line items]        
Current Assets   26    
Non-Current Assets   874    
Current Liabilities   190    
Non-Current Liabilities   419    
Non-Controlling Interest in Operating Subsidiaries   219    
Partnership Capital   72    
Holding LP and other        
Disclosure of subsidiaries [line items]        
Current Assets   529 320  
Non-Current Assets   111 248  
Current Liabilities   735 336  
Non-Current Liabilities   2,480 2,031  
Non-Controlling Interest in Operating Subsidiaries   50 83  
Partnership Capital   $ (2,625) $ (1,882)  
Classification of assets as held for sale | Colombian regulated distribution operation        
Disclosure of subsidiaries [line items]        
Ownership and voting Interest 17.00%      
Disposal of investments in associates and joint ventures $ 90