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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of subsidiaries [line items] |  |  |
Revenues | $ 3,535 | $ 2,115 | $ 1,855
Net income (loss) attributable to partnership | 125 | 487 | 301
Non-Wholly Owned Subsidiaries |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 3,177 | 1,724 | 1,389
Attributable to non-controlling interest, Net Income (loss) | 443 | 41 | 90
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 146 | 67 | (83)
Net income (loss) attributable to partnership | (7) | 163 | 203
Attributable to unitholders, Other Comprehensive Income (loss) | (210) | 126 | 56
U.K. regulated distribution |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 385 | 347 | 339
Attributable to non-controlling interest, Net Income (loss) | 21 | 12 | 21
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 29 | (14) | 25
Net income (loss) attributable to partnership | 114 | 79 | 122
Attributable to unitholders, Other Comprehensive Income (loss) | 118 | (55) | 101
Australian regulated terminal |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 301 | 299 | 330
Attributable to non-controlling interest, Net Income (loss) | 15 | 15 | 15
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 3 | (5) | (4)
Net income (loss) attributable to partnership | 35 | 46 | 68
Attributable to unitholders, Other Comprehensive Income (loss) | 7 | (12) | (9)
Colombian regulated distribution |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 161 | 150 | 152
Attributable to non-controlling interest, Net Income (loss) | 12 | 10 | 13
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 38 | 45 | (26)
Net income (loss) attributable to partnership | 2 | 2 | 16
Attributable to unitholders, Other Comprehensive Income (loss) | 7 | 10 | (9)
Brazilian regulated gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 938 |  |
Attributable to non-controlling interest, Net Income (loss) | 349 |  |
Attributable to non-controlling interest, Other Comprehensive Income (loss) | (160) |  |
Net income (loss) attributable to partnership | 146 |  |
Attributable to unitholders, Other Comprehensive Income (loss) | (72) |  |
U.K. port operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 180 | 178 | 220
Attributable to non-controlling interest, Net Income (loss) | 8 | 11 | 7
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 21 | (37) | 13
Net income (loss) attributable to partnership | 22 | 20 | 22
Attributable to unitholders, Other Comprehensive Income (loss) | 29 | (52) | 18
Australian port operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 501 | 182 |
Attributable to non-controlling interest, Net Income (loss) | (7) | (18) |
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 28 | (24) |
Net income (loss) attributable to partnership | (3) | (7) |
Attributable to unitholders, Other Comprehensive Income (loss) | 9 | (8) |
Chilean toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 154 | 127 | 113
Attributable to non-controlling interest, Net Income (loss) | 0 | (9) | (7)
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 7 | 7 | (20)
Net income (loss) attributable to partnership | 0 | (10) | (15)
Attributable to unitholders, Other Comprehensive Income (loss) | 8 | 8 | (21)
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 | 103 | 97 |
Attributable to non-controlling interest, Net Income (loss) | 12 | (8) |
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 22 | (7) |
Net income (loss) attributable to partnership | 2 | (2) |
Attributable to unitholders, Other Comprehensive Income (loss) | 5 | (1) |
Indian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 57 | 39 |
Attributable to non-controlling interest, Net Income (loss) | (2) | (3) |
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 4 | 1 |
Net income (loss) attributable to partnership | (1) | (3) |
Attributable to unitholders, Other Comprehensive Income (loss) | 3 | 0 |
North American gas storage operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 149 | 100 | 20
Attributable to non-controlling interest, Net Income (loss) | 30 | 1 | (8)
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 74 | 0 | 5
Net income (loss) attributable to partnership | 18 | 1 | (12)
Attributable to unitholders, Other Comprehensive Income (loss) | 47 | 0 | 1
Canadian district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 95 | 79 | 80
Attributable to non-controlling interest, Net Income (loss) | (2) | (1) | 0
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 39 | 31 | 6
Net income (loss) attributable to partnership | 0 | 1 | 0
Attributable to unitholders, Other Comprehensive Income (loss) | 13 | 11 | 2
U.S. district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 131 | 111 | 114
Attributable to non-controlling interest, Net Income (loss) | 10 | (6) | (6)
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 40 | 31 | 8
Net income (loss) attributable to partnership | 7 | 0 | (3)
Attributable to unitholders, Other Comprehensive Income (loss) | 26 | 20 | 5
Holding LP and other |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 22 | 15 | 21
Attributable to non-controlling interest, Net Income (loss) | (3) | 31 | 55
Attributable to non-controlling interest, Other Comprehensive Income (loss) | 1 | 1 | (90)
Net income (loss) attributable to partnership | (349) | 31 | 5
Attributable to unitholders, Other Comprehensive Income (loss) | $ (410) | $ 180 | $ (32)

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