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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]      
Current Assets $ 2,276 $ 1,512 $ 1,632
Non-Current Assets 34,304 27,965 19,643
Current Liabilities 2,417 1,564 1,515
Non-Current Liabilities 19,495 14,439 $ 10,116
Non-Wholly Owned Subsidiaries      
Disclosure of subsidiaries [line items]      
Current Assets 2,188 1,430  
Non-Current Assets 27,349 19,770  
Current Liabilities 2,325 1,465  
Non-Current Liabilities 17,878 12,699  
Non-Controlling Interest in Operating Subsidiaries 7,305 5,873  
Partnership Capital 2,029 1,163  
U.K. regulated distribution operation      
Disclosure of subsidiaries [line items]      
Current Assets 131 107  
Non-Current Assets 3,844 3,550  
Current Liabilities 248 281  
Non-Current Liabilities 2,452 2,261  
Non-Controlling Interest in Operating Subsidiaries 247 217  
Partnership Capital 1,028 898  
Australian regulated terminal operation      
Disclosure of subsidiaries [line items]      
Current Assets 34 38  
Non-Current Assets 2,074 2,229  
Current Liabilities 27 34  
Non-Current Liabilities 1,943 2,035  
Non-Controlling Interest in Operating Subsidiaries 45 62  
Partnership Capital 93 136  
Colombian regulated distribution operation      
Disclosure of subsidiaries [line items]      
Current Assets 51 68  
Non-Current Assets 708 764  
Current Liabilities 32 26  
Non-Current Liabilities 396 438  
Non-Controlling Interest in Operating Subsidiaries 273 302  
Partnership Capital 58 66  
Brazilian regulated gas transmission operation      
Disclosure of subsidiaries [line items]      
Current Assets 310 322  
Non-Current Assets 4,955 5,990  
Current Liabilities 106 73  
Non-Current Liabilities 3,185 2,015  
Non-Controlling Interest in Operating Subsidiaries 1,540 3,081  
Partnership Capital 434 1,143  
Colombian Gas Distribution Operation [Member]      
Disclosure of subsidiaries [line items]      
Current Assets 230    
Non-Current Assets 1,149    
Current Liabilities 235    
Non-Current Liabilities 374    
Non-Controlling Interest in Operating Subsidiaries 691    
Partnership Capital 79    
U.K. port operation      
Disclosure of subsidiaries [line items]      
Current Assets 48 44  
Non-Current Assets 847 880  
Current Liabilities 71 133  
Non-Current Liabilities 347 353  
Non-Controlling Interest in Operating Subsidiaries 195 179  
Partnership Capital 282 259  
Australian port operation      
Disclosure of subsidiaries [line items]      
Current Assets 141 163  
Non-Current Assets 593 628  
Current Liabilities 239 101  
Non-Current Liabilities 59 218  
Non-Controlling Interest in Operating Subsidiaries 319 346  
Partnership Capital 117 126  
Chilean toll roads      
Disclosure of subsidiaries [line items]      
Current Assets 82 84  
Non-Current Assets 940 1,116  
Current Liabilities 59 59  
Non-Current Liabilities 862 989  
Non-Controlling Interest in Operating Subsidiaries 43 75  
Partnership Capital 58 77  
Peruvian toll roads      
Disclosure of subsidiaries [line items]      
Current Assets 104 101  
Non-Current Assets 1,308 1,356  
Current Liabilities 20 18  
Non-Current Liabilities 654 674  
Non-Controlling Interest in Operating Subsidiaries 622 644  
Partnership Capital 116 121  
Indian toll roads      
Disclosure of subsidiaries [line items]      
Current Assets 90 58  
Non-Current Assets 975 256  
Current Liabilities 65 30  
Non-Current Liabilities 667 185  
Non-Controlling Interest in Operating Subsidiaries 229 60  
Partnership Capital 104 39  
North American gas storage operation      
Disclosure of subsidiaries [line items]      
Current Assets 281 206  
Non-Current Assets 1,273 1,259  
Current Liabilities 155 244  
Non-Current Liabilities 566 409  
Non-Controlling Interest in Operating Subsidiaries 515 502  
Partnership Capital 318 310  
Canadian district energy operation      
Disclosure of subsidiaries [line items]      
Current Assets 25 75  
Non-Current Assets 754 699  
Current Liabilities 32 55  
Non-Current Liabilities 387 394  
Non-Controlling Interest in Operating Subsidiaries 269 243  
Partnership Capital 91 82  
U.S. district energy operation      
Disclosure of subsidiaries [line items]      
Current Assets 42 37  
Non-Current Assets 834 799  
Current Liabilities 26 19  
Non-Current Liabilities 681 668  
Non-Controlling Interest in Operating Subsidiaries 90 78  
Partnership Capital 79 71  
Western Canadian Natural Gas Gathering and Processing Operation [Member]      
Disclosure of subsidiaries [line items]      
Current Assets 86    
Non-Current Assets 2,069    
Current Liabilities 84    
Non-Current Liabilities 1,161    
Non-Controlling Interest in Operating Subsidiaries 650    
Partnership Capital 260    
North American Residential Energy Infrastructure Operation [Member]      
Disclosure of subsidiaries [line items]      
Current Assets 196    
Non-Current Assets 3,647    
Current Liabilities 152    
Non-Current Liabilities 1,551    
Non-Controlling Interest in Operating Subsidiaries 1,506    
Partnership Capital 634    
U.S. Data Center Operation [Member]      
Disclosure of subsidiaries [line items]      
Current Assets 17    
Non-Current Assets 1,131    
Current Liabilities 438    
Non-Current Liabilities 562    
Non-Controlling Interest in Operating Subsidiaries (12)    
Partnership Capital 160    
Holding LP and other      
Disclosure of subsidiaries [line items]      
Current Assets 320 127  
Non-Current Assets 248 244  
Current Liabilities 336 392  
Non-Current Liabilities 2,031 2,060  
Non-Controlling Interest in Operating Subsidiaries 83 84  
Partnership Capital $ (1,882) $ (2,165)