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SEGMENT INFORMATION (Operating Segments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Revenues $ 3,535 $ 2,115 $ 1,855
Costs attributed to revenues (1,509) (1,063) (798)
General and administrative costs (239) (166) (134)
Other income (expense) (61) 95 36
Interest expense (428) (392) (367)
Depreciation and amortization (671) (447) (375)
Deferred taxes (67) 18 26
Mark-to-market on hedging items and other (82) 133 79
Share of earnings from associates 118 248 69
Net income attributable to non-controlling interest and preferred unitholders (471) (54) (90)
Net income (loss) attributable to partnership 125 487 301
Reportable segments      
Disclosure of operating segments [line items]      
Revenues 3,301 2,590 2,313
Costs attributed to revenues (1,498) (1,102) (1,002)
General and administrative costs (239) (166) (134)
Adjusted EBITDA 1,564 1,322 1,177
Other income (expense) 40 78 27
Interest expense (434) (456) (396)
Funds From Operations 1,170 944 808
Depreciation and amortization (726) (609) (506)
Deferred taxes (7) 5 53
Mark-to-market on hedging items and other (312) 147 (54)
Share of earnings from associates 0 0 0
Net income attributable to non-controlling interest and preferred unitholders 0 0 0
Net income (loss) attributable to partnership 125 487 301
Reportable segments | Utilities      
Disclosure of operating segments [line items]      
Revenues 988 684 698
Costs attributed to revenues (250) (160) (174)
General and administrative costs 0 0 0
Adjusted EBITDA 738 524 524
Other income (expense) (14) 5 5
Interest expense (114) (130) (142)
Funds From Operations 610 399 387
Depreciation and amortization (186) (154) (153)
Deferred taxes (52) 5 (8)
Mark-to-market on hedging items and other (59) (88) (16)
Share of earnings from associates 0 0 0
Net income attributable to non-controlling interest and preferred unitholders 0 0 0
Net income (loss) attributable to partnership 313 162 210
Reportable segments | Transport      
Disclosure of operating segments [line items]      
Revenues 1,589 1,247 1,143
Costs attributed to revenues (895) (650) (588)
General and administrative costs 0 0 0
Adjusted EBITDA 694 597 555
Other income (expense) (4) (17) (15)
Interest expense (158) (157) (142)
Funds From Operations 532 423 398
Depreciation and amortization (312) (253) (217)
Deferred taxes (1) 26 21
Mark-to-market on hedging items and other (80) 10 (67)
Share of earnings from associates 0 0 0
Net income attributable to non-controlling interest and preferred unitholders 0 0 0
Net income (loss) attributable to partnership 139 206 135
Reportable segments | Energy      
Disclosure of operating segments [line items]      
Revenues 559 496 349
Costs attributed to revenues (278) (220) (183)
General and administrative costs 0 0 0
Adjusted EBITDA 281 276 166
Other income (expense) 15 8 3
Interest expense (87) (109) (79)
Funds From Operations 209 175 90
Depreciation and amortization (151) (128) (90)
Deferred taxes 11 (38) 14
Mark-to-market on hedging items and other (37) 81 (14)
Share of earnings from associates 0 0 0
Net income attributable to non-controlling interest and preferred unitholders 0 0 0
Net income (loss) attributable to partnership 32 90 0
Reportable segments | Comm. Infrastructure      
Disclosure of operating segments [line items]      
Revenues 165 163 123
Costs attributed to revenues (75) (72) (57)
General and administrative costs 0 0 0
Adjusted EBITDA 90 91 66
Other income (expense) (2) (2) 0
Interest expense (12) (12) (6)
Funds From Operations 76 77 60
Depreciation and amortization (77) (74) (46)
Deferred taxes 21 29 14
Mark-to-market on hedging items and other (9) (5) (13)
Share of earnings from associates 0 0 0
Net income attributable to non-controlling interest and preferred unitholders 0 0 0
Net income (loss) attributable to partnership 11 27 15
Reportable segments | Corporate      
Disclosure of operating segments [line items]      
Revenues 0 0 0
Costs attributed to revenues 0 0 0
General and administrative costs (239) (166) (134)
Adjusted EBITDA (239) (166) (134)
Other income (expense) 45 84 34
Interest expense (63) (48) (27)
Funds From Operations (257) (130) (127)
Depreciation and amortization 0 0 0
Deferred taxes 14 (17) 12
Mark-to-market on hedging items and other (127) 149 56
Share of earnings from associates 0 0 0
Net income attributable to non-controlling interest and preferred unitholders 0 0 0
Net income (loss) attributable to partnership (370) 2 (59)
Contribution from investments in associates      
Disclosure of operating segments [line items]      
Revenues (1,624) (1,311) (1,044)
Costs attributed to revenues 861 651 546
General and administrative costs 0 0 0
Adjusted EBITDA (763) (660) (498)
Other income (expense) 7 16 13
Interest expense 172 190 144
Funds From Operations (584) (454) (341)
Depreciation and amortization 382 328 246
Deferred taxes (22) 9 (41)
Mark-to-market on hedging items and other 106 (131) 67
Share of earnings from associates 118 248 69
Net income attributable to non-controlling interest and preferred unitholders 0 0 0
Net income (loss) attributable to partnership 0 0 0
Attributable to non- controlling interest      
Disclosure of operating segments [line items]      
Revenues 1,858 836 586
Costs attributed to revenues (872) (612) (342)
General and administrative costs 0 0 0
Adjusted EBITDA 986 224 244
Other income (expense) (108) 1 (4)
Interest expense (166) (126) (115)
Funds From Operations 712 99 125
Depreciation and amortization (327) (166) (115)
Deferred taxes (38) 4 14
Mark-to-market on hedging items and other 124 117 66
Share of earnings from associates 0 0 0
Net income attributable to non-controlling interest and preferred unitholders (471) (54) (90)
Net income (loss) attributable to partnership $ 0 $ 0 $ 0