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SEGMENT INFORMATION (Operating Segments) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disclosure of operating segments [line items]          
Revenues $ 1,044 $ 934 $ 2,057 $ 1,590  
Costs attributed to revenues (467) (373) (876) (716)  
General and administrative costs (54) (59) (112) (110)  
Other income (expense) (12) (13) (17) 14  
Interest expense (125) (107) (239) (201)  
Depreciation and amortization (188) (206) (381) (326)  
Deferred taxes (26) (18) (41) (18)  
Mark-to-market on hedging items and other 46 (59) (179) (111)  
Gain (Loss) on Disposition of Business 0 0 338 0  
Share of earnings from associates 1 36 (4) 59 $ 118
Net income attributable to non-controlling interest and preferred unitholders (94) (122) (212) (146)  
Net income (loss) attributable to partnership 125 13 334 35  
Utilities          
Disclosure of operating segments [line items]          
Revenues 589   1,124    
Transport          
Disclosure of operating segments [line items]          
Revenues 341   680    
Energy          
Disclosure of operating segments [line items]          
Revenues 114   253    
Reportable segments          
Disclosure of operating segments [line items]          
Revenues 837 837 1,729 1,569  
Costs attributed to revenues (395) (375) (804) (706)  
General and administrative costs (54) (59) (112) (110)  
Adjusted EBITDA 388 403 813 753  
Other income (expense) 10 2 30 23  
Interest expense (104) (110) (216) (220)  
Funds From Operations 294 295 627 556  
Depreciation and amortization (183) (186) (393) (344)  
Deferred taxes (13) (5) (15) (8)  
Mark-to-market on hedging items and other 27 (91) (223) (169)  
Gain (Loss) on Disposition of Business     338    
Share of earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest and preferred unitholders 0 0 0 0  
Net income (loss) attributable to partnership 125 13 334 35  
Reportable segments | Utilities          
Disclosure of operating segments [line items]          
Revenues 245 278 517 454  
Costs attributed to revenues (68) (73) (137) (121)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 177 205 380 333  
Other income (expense) (8) (8) (11) (7)  
Interest expense (30) (29) (61) (58)  
Funds From Operations 139 168 308 268  
Depreciation and amortization (43) (57) (101) (89)  
Deferred taxes (12) (12) (27) (18)  
Mark-to-market on hedging items and other (10) (12) (57) (28)  
Gain (Loss) on Disposition of Business     0    
Share of earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest and preferred unitholders 0 0 0 0  
Net income (loss) attributable to partnership 74 87 123 133  
Reportable segments | Transport          
Disclosure of operating segments [line items]          
Revenues 410 395 834 770  
Costs attributed to revenues (237) (224) (483) (434)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 173 171 351 336  
Other income (expense) 0 1 2 (2)  
Interest expense (40) (38) (83) (77)  
Funds From Operations 133 134 270 257  
Depreciation and amortization (85) (75) (184) (151)  
Deferred taxes (1) 2 12 7  
Mark-to-market on hedging items and other (23) (18) (62) (39)  
Gain (Loss) on Disposition of Business     0    
Share of earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest and preferred unitholders 0 0 0 0  
Net income (loss) attributable to partnership 24 43 36 74  
Reportable segments | Energy          
Disclosure of operating segments [line items]          
Revenues 137 123 290 265  
Costs attributed to revenues (68) (60) (142) (116)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 69 63 148 149  
Other income (expense) 3 3 8 6  
Interest expense (18) (23) (36) (50)  
Funds From Operations 54 43 120 105  
Depreciation and amortization (38) (35) (71) (68)  
Deferred taxes (1) 5 (3) 0  
Mark-to-market on hedging items and other (20) (12) (38) (19)  
Gain (Loss) on Disposition of Business     0    
Share of earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest and preferred unitholders 0 0 0 0  
Net income (loss) attributable to partnership (5) 1 8 18  
Reportable segments | Comm. Infrastructure          
Disclosure of operating segments [line items]          
Revenues 45 41 88 80  
Costs attributed to revenues (22) (18) (42) (35)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 23 23 46 45  
Other income (expense) (1) (1) (2) (1)  
Interest expense (3) (3) (6) (6)  
Funds From Operations 19 19 38 38  
Depreciation and amortization (17) (19) (37) (36)  
Deferred taxes 0 3 2 5  
Mark-to-market on hedging items and other 1 (1) 1 (2)  
Gain (Loss) on Disposition of Business     0    
Share of earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest and preferred unitholders 0 0 0 0  
Net income (loss) attributable to partnership 3 2 4 5  
Reportable segments | Corporate          
Disclosure of operating segments [line items]          
Revenues 0 0 0 0  
Costs attributed to revenues 0 0 0 0  
General and administrative costs (54) (59) (112) (110)  
Adjusted EBITDA (54) (59) (112) (110)  
Other income (expense) 16 7 33 27  
Interest expense (13) (17) (30) (29)  
Funds From Operations (51) (69) (109) (112)  
Depreciation and amortization 0 0 0 0  
Deferred taxes 1 (3) 1 (2)  
Mark-to-market on hedging items and other 79 (48) (67) (81)  
Gain (Loss) on Disposition of Business     338    
Share of earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest and preferred unitholders 0 0 0 0  
Net income (loss) attributable to partnership 29 (120) 163 (195)  
Contribution from investments in associates          
Disclosure of operating segments [line items]          
Revenues (368) (408) (791) (788)  
Costs attributed to revenues 211 220 431 411  
General and administrative costs 0 0 0 0  
Adjusted EBITDA (157) (188) (360) (377)  
Other income (expense) 4 1 4 7  
Interest expense 30 44 72 93  
Funds From Operations (123) (143) (284) (277)  
Depreciation and amortization 91 91 202 179  
Deferred taxes (3) (3) (12) (1)  
Mark-to-market on hedging items and other 34 19 98 40  
Gain (Loss) on Disposition of Business     0    
Share of earnings from associates 1 36 (4) 59  
Net income attributable to non-controlling interest and preferred unitholders 0 0 0 0  
Net income (loss) attributable to partnership 0 0 0 0  
Attributable to non- controlling interest          
Disclosure of operating segments [line items]          
Revenues 575 505 1,119 809  
Costs attributed to revenues (283) (218) (503) (421)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 292 287 616 388  
Other income (expense) (26) (16) (51) (16)  
Interest expense (51) (41) (95) (74)  
Funds From Operations 215 230 470 298  
Depreciation and amortization (96) (111) (190) (161)  
Deferred taxes (10) (10) (14) (9)  
Mark-to-market on hedging items and other (15) 13 (54) 18  
Gain (Loss) on Disposition of Business     0    
Share of earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest and preferred unitholders (94) (122) (212) (146)  
Net income (loss) attributable to partnership $ 0 $ 0 $ 0 $ 0