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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]      
Revenues $ 4,652 $ 3,535 $ 2,115
Net income (loss) attributable to partnership 410 125 487
Non-Wholly Owned Subsidiaries      
Disclosure of subsidiaries [line items]      
Revenues 4,301 3,177 1,724
Attributable to non-controlling interest, Net Income (loss) 397 443 41
Attributable to non-controlling interest, Other Comprehensive Income (loss) (657) 146 67
Net income (loss) attributable to partnership 385 (7) 163
Attributable to unitholders, Other Comprehensive Income (loss) (114) (210) 126
U.K. regulated distribution operation      
Disclosure of subsidiaries [line items]      
Revenues 449 385 347
Attributable to non-controlling interest, Net Income (loss) 22 21 12
Attributable to non-controlling interest, Other Comprehensive Income (loss) 19 29 (14)
Net income (loss) attributable to partnership 99 114 79
Attributable to unitholders, Other Comprehensive Income (loss) 86 118 (55)
Australian regulated terminal operation      
Disclosure of subsidiaries [line items]      
Revenues 307 301 299
Attributable to non-controlling interest, Net Income (loss) 14 15 15
Attributable to non-controlling interest, Other Comprehensive Income (loss) (6) 3 (5)
Net income (loss) attributable to partnership 34 35 46
Attributable to unitholders, Other Comprehensive Income (loss) (16) 7 (12)
Colombian regulated distribution operation      
Disclosure of subsidiaries [line items]      
Revenues 177 161 150
Attributable to non-controlling interest, Net Income (loss) 15 12 10
Attributable to non-controlling interest, Other Comprehensive Income (loss) (11) 38 45
Net income (loss) attributable to partnership 3 2 2
Attributable to unitholders, Other Comprehensive Income (loss) (2) 7 10
Brazilian regulated gas transmission operation      
Disclosure of subsidiaries [line items]      
Revenues 1,112 938  
Attributable to non-controlling interest, Net Income (loss) 357 349  
Attributable to non-controlling interest, Other Comprehensive Income (loss) (469) (160)  
Net income (loss) attributable to partnership 139 146  
Attributable to unitholders, Other Comprehensive Income (loss) (190) (72)  
Colombian Gas Distribution Operation [Member]      
Disclosure of subsidiaries [line items]      
Revenues 516    
Attributable to non-controlling interest, Net Income (loss) 34    
Attributable to non-controlling interest, Other Comprehensive Income (loss) (91)    
Net income (loss) attributable to partnership 7    
Attributable to unitholders, Other Comprehensive Income (loss) (14)    
U.K. port operation      
Disclosure of subsidiaries [line items]      
Revenues 205 180 178
Attributable to non-controlling interest, Net Income (loss) 12 8 11
Attributable to non-controlling interest, Other Comprehensive Income (loss) 3 21 (37)
Net income (loss) attributable to partnership 19 22 20
Attributable to unitholders, Other Comprehensive Income (loss) 4 29 (52)
Australian port operation      
Disclosure of subsidiaries [line items]      
Revenues 522 501 182
Attributable to non-controlling interest, Net Income (loss) (6) (7) (18)
Attributable to non-controlling interest, Other Comprehensive Income (loss) (33) 28 (24)
Net income (loss) attributable to partnership (3) (3) (7)
Attributable to unitholders, Other Comprehensive Income (loss) (11) 9 (8)
Chilean toll roads      
Disclosure of subsidiaries [line items]      
Revenues 168 154 127
Attributable to non-controlling interest, Net Income (loss) (1) 0 (9)
Attributable to non-controlling interest, Other Comprehensive Income (loss) (7) 7 7
Net income (loss) attributable to partnership (1) 0 (10)
Attributable to unitholders, Other Comprehensive Income (loss) (7) 8 8
Brazilian toll roads      
Disclosure of subsidiaries [line items]      
Revenues     0
Attributable to non-controlling interest, Net Income (loss)     6
Attributable to non-controlling interest, Other Comprehensive Income (loss)     38
Net income (loss) attributable to partnership     5
Attributable to unitholders, Other Comprehensive Income (loss)     25
Peruvian toll roads      
Disclosure of subsidiaries [line items]      
Revenues 92 103 97
Attributable to non-controlling interest, Net Income (loss) 3 12 (8)
Attributable to non-controlling interest, Other Comprehensive Income (loss) (25) 22 (7)
Net income (loss) attributable to partnership 1 2 (2)
Attributable to unitholders, Other Comprehensive Income (loss) (5) 5 (1)
Indian toll roads      
Disclosure of subsidiaries [line items]      
Revenues 61 57 39
Attributable to non-controlling interest, Net Income (loss) (12) (2) (3)
Attributable to non-controlling interest, Other Comprehensive Income (loss) 2 4 1
Net income (loss) attributable to partnership (6) (1) (3)
Attributable to unitholders, Other Comprehensive Income (loss) (1) 3 0
North American gas storage operation      
Disclosure of subsidiaries [line items]      
Revenues 150 149 100
Attributable to non-controlling interest, Net Income (loss) (16) 30 1
Attributable to non-controlling interest, Other Comprehensive Income (loss) 22 74 0
Net income (loss) attributable to partnership (12) 18 1
Attributable to unitholders, Other Comprehensive Income (loss) 15 47 0
Canadian district energy operation      
Disclosure of subsidiaries [line items]      
Revenues 118 95 79
Attributable to non-controlling interest, Net Income (loss) 7 (2) (1)
Attributable to non-controlling interest, Other Comprehensive Income (loss) 32 39 31
Net income (loss) attributable to partnership 3 0 1
Attributable to unitholders, Other Comprehensive Income (loss) 11 13 11
U.S. district energy operation      
Disclosure of subsidiaries [line items]      
Revenues 149 131 111
Attributable to non-controlling interest, Net Income (loss) (13) 10 (6)
Attributable to non-controlling interest, Other Comprehensive Income (loss) 35 40 31
Net income (loss) attributable to partnership (8) 7 0
Attributable to unitholders, Other Comprehensive Income (loss) 23 26 20
Western Canadian Natural Gas Gathering and Processing Operation [Member]      
Disclosure of subsidiaries [line items]      
Revenues 61    
Attributable to non-controlling interest, Net Income (loss) 3    
Attributable to non-controlling interest, Other Comprehensive Income (loss) (53)    
Net income (loss) attributable to partnership 1    
Attributable to unitholders, Other Comprehensive Income (loss) (21)    
North American Residential Energy Infrastructure Operation [Member]      
Disclosure of subsidiaries [line items]      
Revenues 191    
Attributable to non-controlling interest, Net Income (loss) 4    
Attributable to non-controlling interest, Other Comprehensive Income (loss) (73)    
Net income (loss) attributable to partnership 1    
Attributable to unitholders, Other Comprehensive Income (loss) (30)    
U.S. Data Center Operation [Member]      
Disclosure of subsidiaries [line items]      
Revenues 0    
Attributable to non-controlling interest, Net Income (loss) 0    
Attributable to non-controlling interest, Other Comprehensive Income (loss) (1)    
Net income (loss) attributable to partnership 0    
Attributable to unitholders, Other Comprehensive Income (loss) 0    
Holding LP and other      
Disclosure of subsidiaries [line items]      
Revenues 23 22 15
Attributable to non-controlling interest, Net Income (loss) (26) (3) 31
Attributable to non-controlling interest, Other Comprehensive Income (loss) (1) 1 1
Net income (loss) attributable to partnership 108 (349) 31
Attributable to unitholders, Other Comprehensive Income (loss) $ 44 $ (410) $ 180