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SEGMENT INFORMATION (Operating Segments) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disclosure of operating segments [line items]          
Revenues $ 1,685 $ 1,044 $ 3,278 $ 2,057  
Costs attributed to revenues (840) (467) (1,638) (876)  
General and administrative costs (64) (54) (125) (112)  
Other income (expense) 3 (12) (13) (17)  
Interest expense (241) (125) (453) (239)  
Depreciation and amortization (323) (188) (615) (381)  
Deferred taxes 1 (26) (11) (41)  
Mark-to-market on hedging items and other (1) 46 (56) (179)  
Share of earnings from associates 34 1 52 (4) $ (13)
Net income attributable to non-controlling interest and preferred unitholders (156) (94) (291) (212)  
Net income (loss) attributable to partnership 98 125 128 334  
Gain (Loss) on Disposition of Business 0 0 0 338  
Utilities          
Disclosure of operating segments [line items]          
Revenues 743 589 1,471 1,124  
Transport          
Disclosure of operating segments [line items]          
Revenues 350 341 686 680  
Energy          
Disclosure of operating segments [line items]          
Revenues 512 114 962 253  
Reportable segments          
Disclosure of operating segments [line items]          
Revenues 987 837 1,952 1,729  
Costs attributed to revenues (451) (395) (883) (804)  
General and administrative costs (64) (54) (125) (112)  
Adjusted EBITDA 472 388 944 813  
Other income (expense) 19 10 38 30  
Interest expense (154) (104) (294) (216)  
Funds From Operations 337 294 688 627  
Depreciation and amortization (234) (183) (454) (393)  
Deferred taxes (19) (13) (21) (15)  
Mark-to-market on hedging items and other 14 27 (85) (223)  
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 98 125 128 334  
Gain (Loss) on Disposition of Business       338  
Reportable segments | Utilities          
Disclosure of operating segments [line items]          
Revenues 278 245 547 517  
Costs attributed to revenues (88) (68) (176) (137)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 190 177 371 380  
Other income (expense) (9) (8) (19) (11)  
Interest expense (38) (30) (72) (61)  
Funds From Operations 143 139 280 308  
Depreciation and amortization (44) (43) (89) (101)  
Deferred taxes (27) (12) (40) (27)  
Mark-to-market on hedging items and other 44 (10) 33 (57)  
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 116 74 184 123  
Gain (Loss) on Disposition of Business       0  
Reportable segments | Transport          
Disclosure of operating segments [line items]          
Revenues 386 410 775 834  
Costs attributed to revenues (202) (237) (402) (483)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 184 173 373 351  
Other income (expense) 2 0 1 2  
Interest expense (51) (40) (100) (83)  
Funds From Operations 135 133 274 270  
Depreciation and amortization (94) (85) (185) (184)  
Deferred taxes 5 (1) 11 12  
Mark-to-market on hedging items and other (37) (23) (77) (62)  
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 9 24 23 36  
Gain (Loss) on Disposition of Business       0  
Reportable segments | Energy          
Disclosure of operating segments [line items]          
Revenues 256 137 501 290  
Costs attributed to revenues (133) (68) (251) (142)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 123 69 250 148  
Other income (expense) 6 3 14 8  
Interest expense (33) (18) (61) (36)  
Funds From Operations 96 54 203 120  
Depreciation and amortization (65) (38) (124) (71)  
Deferred taxes 3 (1) 1 (3)  
Mark-to-market on hedging items and other (25) (20) (39) (38)  
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 9 (5) 41 8  
Gain (Loss) on Disposition of Business       0  
Reportable segments | Comm. Infrastructure          
Disclosure of operating segments [line items]          
Revenues 67 45 129 88  
Costs attributed to revenues (28) (22) (54) (42)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 39 23 75 46  
Other income (expense) 1 (1) 2 (2)  
Interest expense (10) (3) (19) (6)  
Funds From Operations 30 19 58 38  
Depreciation and amortization (30) (17) (55) (37)  
Deferred taxes (1) 0 3 2  
Mark-to-market on hedging items and other (9) 1 (15) 1  
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 (10) 3 (9) 4  
Gain (Loss) on Disposition of Business       0  
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 (64) (54) (125) (112)  
Adjusted EBITDA (64) (54) (125) (112)  
Other income (expense) 19 16 40 33  
Interest expense (22) (13) (42) (30)  
Funds From Operations (67) (51) (127) (109)  
Depreciation and amortization (1) 0 (1) 0  
Deferred taxes 1 1 4 1  
Mark-to-market on hedging items and other 41 79 13 (67)  
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 (26) 29 (111) 163  
Gain (Loss) on Disposition of Business       338  
Contribution from investments in associates          
Disclosure of operating segments [line items]          
Revenues (369) (368) (737) (791)  
Costs attributed to revenues 180 211 357 431  
General and administrative costs 0 0 0 0  
Adjusted EBITDA (189) (157) (380) (360)  
Other income (expense) (1) 4 2 4  
Interest expense 46 30 87 72  
Funds From Operations (144) (123) (291) (284)  
Depreciation and amortization 105 91 203 202  
Deferred taxes 14 (3) 10 (12)  
Mark-to-market on hedging items and other (9) 34 26 98  
Share of earnings from associates 34 1 52 (4)  
Net income attributable to non-controlling interest and preferred unitholders 0 0 0 0  
Net income (loss) attributable to partnership 0 0 0 0  
Gain (Loss) on Disposition of Business       0  
Attributable to non- controlling interest          
Disclosure of operating segments [line items]          
Revenues 1,067 575 2,063 1,119  
Costs attributed to revenues (569) (283) (1,112) (503)  
General and administrative costs 0 0 0 0  
Adjusted EBITDA 498 292 951 616  
Other income (expense) (15) (26) (53) (51)  
Interest expense (133) (51) (246) (95)  
Funds From Operations 350 215 652 470  
Depreciation and amortization (194) (96) (364) (190)  
Deferred taxes 6 (10) 0 (14)  
Mark-to-market on hedging items and other (6) (15) 3 (54)  
Share of earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest and preferred unitholders (156) (94) (291) (212)  
Net income (loss) attributable to partnership $ 0 $ 0 $ 0 0  
Gain (Loss) on Disposition of Business       $ 0