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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of subsidiaries [line items]      
Current Assets $ 1,512 $ 1,632 $ 1,553
Non-Current Assets 27,965 19,643 16,182
Current Liabilities 1,564 1,515 1,210
Non-Current Liabilities 14,439 10,116 $ 9,349
Non-Wholly Owned Subsidiaries      
Disclosure of subsidiaries [line items]      
Current Assets 1,430 1,542  
Non-Current Assets 19,770 13,034  
Current Liabilities 1,465 1,402  
Non-Current Liabilities 12,699 8,620  
Non-Controlling Interest in Operating Subsidiaries 5,873 2,771  
Partnership Capital 1,163 1,783  
U.K. regulated distribution      
Disclosure of subsidiaries [line items]      
Current Assets 107 65  
Non-Current Assets 3,550 2,985  
Current Liabilities 281 154  
Non-Current Liabilities 2,261 1,919  
Non-Controlling Interest in Operating Subsidiaries 217 183  
Partnership Capital 898 794  
Australian regulated terminal      
Disclosure of subsidiaries [line items]      
Current Assets 38 27  
Non-Current Assets 2,229 2,162  
Current Liabilities 34 (9)  
Non-Current Liabilities 2,035 1,926  
Non-Controlling Interest in Operating Subsidiaries 62 70  
Partnership Capital 136 202  
Colombian regulated distribution      
Disclosure of subsidiaries [line items]      
Current Assets 68 55  
Non-Current Assets 764 701  
Current Liabilities 26 27  
Non-Current Liabilities 438 369  
Non-Controlling Interest in Operating Subsidiaries 302 294  
Partnership Capital 66 66  
Brazilian regulated gas transmission operation      
Disclosure of subsidiaries [line items]      
Current Assets 322    
Non-Current Assets 5,990    
Current Liabilities 73    
Non-Current Liabilities 2,015    
Non-Controlling Interest in Operating Subsidiaries 3,081    
Partnership Capital 1,143    
U.K. port operation      
Disclosure of subsidiaries [line items]      
Current Assets 44 42  
Non-Current Assets 880 754  
Current Liabilities 133 108  
Non-Current Liabilities 353 324  
Non-Controlling Interest in Operating Subsidiaries 179 150  
Partnership Capital 259 214  
Australian port operation      
Disclosure of subsidiaries [line items]      
Current Assets 163 142  
Non-Current Assets 628 587  
Current Liabilities 101 94  
Non-Current Liabilities 218 205  
Non-Controlling Interest in Operating Subsidiaries 346 315  
Partnership Capital 126 115  
Chilean toll roads      
Disclosure of subsidiaries [line items]      
Current Assets 84 102  
Non-Current Assets 1,116 1,069  
Current Liabilities 59 50  
Non-Current Liabilities 989 941  
Non-Controlling Interest in Operating Subsidiaries 75 89  
Partnership Capital 77 91  
Brazilian toll roads      
Disclosure of subsidiaries [line items]      
Current Assets   42  
Non-Current Assets   466  
Current Liabilities   27  
Non-Current Liabilities   0  
Non-Controlling Interest in Operating Subsidiaries   189  
Partnership Capital   292  
Peruvian toll roads      
Disclosure of subsidiaries [line items]      
Current Assets 101 127  
Non-Current Assets 1,356 1,261  
Current Liabilities 18 27  
Non-Current Liabilities 674 635  
Non-Controlling Interest in Operating Subsidiaries 644 610  
Partnership Capital 121 116  
Indian toll roads      
Disclosure of subsidiaries [line items]      
Current Assets 58 52  
Non-Current Assets 256 264  
Current Liabilities 30 36  
Non-Current Liabilities 185 186  
Non-Controlling Interest in Operating Subsidiaries 60 58  
Partnership Capital 39 36  
North American gas storage operation      
Disclosure of subsidiaries [line items]      
Current Assets 206 199  
Non-Current Assets 1,259 1,141  
Current Liabilities 244 136  
Non-Current Liabilities 409 478  
Non-Controlling Interest in Operating Subsidiaries 502 452  
Partnership Capital 310 274  
Canadian district energy operation      
Disclosure of subsidiaries [line items]      
Current Assets 75 15  
Non-Current Assets 699 570  
Current Liabilities 55 13  
Non-Current Liabilities 394 290  
Non-Controlling Interest in Operating Subsidiaries 243 209  
Partnership Capital 82 73  
U.S. district energy operation      
Disclosure of subsidiaries [line items]      
Current Assets 37 43  
Non-Current Assets 799 697  
Current Liabilities 19 62  
Non-Current Liabilities 668 537  
Non-Controlling Interest in Operating Subsidiaries 78 73  
Partnership Capital 71 68  
Holding LP and other      
Disclosure of subsidiaries [line items]      
Current Assets 127 631  
Non-Current Assets 244 377  
Current Liabilities 392 677  
Non-Current Liabilities 2,060 810  
Non-Controlling Interest in Operating Subsidiaries 84 79  
Partnership Capital $ (2,165) $ (558)