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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of subsidiaries [line items] |  |  |
Current Assets | $ 1,512 | $ 1,632 | $ 1,553
Non-Current Assets | 27,965 | 19,643 | 16,182
Current Liabilities | 1,564 | 1,515 | 1,210
Non-Current Liabilities | 14,439 | 10,116 | $ 9,349
Non-Wholly Owned Subsidiaries |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 1,430 | 1,542 |
Non-Current Assets | 19,770 | 13,034 |
Current Liabilities | 1,465 | 1,402 |
Non-Current Liabilities | 12,699 | 8,620 |
Non-Controlling Interest in Operating Subsidiaries | 5,873 | 2,771 |
Partnership Capital | 1,163 | 1,783 |
U.K. regulated distribution |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 107 | 65 |
Non-Current Assets | 3,550 | 2,985 |
Current Liabilities | 281 | 154 |
Non-Current Liabilities | 2,261 | 1,919 |
Non-Controlling Interest in Operating Subsidiaries | 217 | 183 |
Partnership Capital | 898 | 794 |
Australian regulated terminal |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 38 | 27 |
Non-Current Assets | 2,229 | 2,162 |
Current Liabilities | 34 | (9) |
Non-Current Liabilities | 2,035 | 1,926 |
Non-Controlling Interest in Operating Subsidiaries | 62 | 70 |
Partnership Capital | 136 | 202 |
Colombian regulated distribution |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 68 | 55 |
Non-Current Assets | 764 | 701 |
Current Liabilities | 26 | 27 |
Non-Current Liabilities | 438 | 369 |
Non-Controlling Interest in Operating Subsidiaries | 302 | 294 |
Partnership Capital | 66 | 66 |
Brazilian regulated gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 322 |  |
Non-Current Assets | 5,990 |  |
Current Liabilities | 73 |  |
Non-Current Liabilities | 2,015 |  |
Non-Controlling Interest in Operating Subsidiaries | 3,081 |  |
Partnership Capital | 1,143 |  |
U.K. port operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 44 | 42 |
Non-Current Assets | 880 | 754 |
Current Liabilities | 133 | 108 |
Non-Current Liabilities | 353 | 324 |
Non-Controlling Interest in Operating Subsidiaries | 179 | 150 |
Partnership Capital | 259 | 214 |
Australian port operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 163 | 142 |
Non-Current Assets | 628 | 587 |
Current Liabilities | 101 | 94 |
Non-Current Liabilities | 218 | 205 |
Non-Controlling Interest in Operating Subsidiaries | 346 | 315 |
Partnership Capital | 126 | 115 |
Chilean toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 84 | 102 |
Non-Current Assets | 1,116 | 1,069 |
Current Liabilities | 59 | 50 |
Non-Current Liabilities | 989 | 941 |
Non-Controlling Interest in Operating Subsidiaries | 75 | 89 |
Partnership Capital | 77 | 91 |
Brazilian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets |  | 42 |
Non-Current Assets |  | 466 |
Current Liabilities |  | 27 |
Non-Current Liabilities |  | 0 |
Non-Controlling Interest in Operating Subsidiaries |  | 189 |
Partnership Capital |  | 292 |
Peruvian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 101 | 127 |
Non-Current Assets | 1,356 | 1,261 |
Current Liabilities | 18 | 27 |
Non-Current Liabilities | 674 | 635 |
Non-Controlling Interest in Operating Subsidiaries | 644 | 610 |
Partnership Capital | 121 | 116 |
Indian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 58 | 52 |
Non-Current Assets | 256 | 264 |
Current Liabilities | 30 | 36 |
Non-Current Liabilities | 185 | 186 |
Non-Controlling Interest in Operating Subsidiaries | 60 | 58 |
Partnership Capital | 39 | 36 |
North American gas storage operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 206 | 199 |
Non-Current Assets | 1,259 | 1,141 |
Current Liabilities | 244 | 136 |
Non-Current Liabilities | 409 | 478 |
Non-Controlling Interest in Operating Subsidiaries | 502 | 452 |
Partnership Capital | 310 | 274 |
Canadian district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 75 | 15 |
Non-Current Assets | 699 | 570 |
Current Liabilities | 55 | 13 |
Non-Current Liabilities | 394 | 290 |
Non-Controlling Interest in Operating Subsidiaries | 243 | 209 |
Partnership Capital | 82 | 73 |
U.S. district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 37 | 43 |
Non-Current Assets | 799 | 697 |
Current Liabilities | 19 | 62 |
Non-Current Liabilities | 668 | 537 |
Non-Controlling Interest in Operating Subsidiaries | 78 | 73 |
Partnership Capital | 71 | 68 |
Holding LP and other |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 127 | 631 |
Non-Current Assets | 244 | 377 |
Current Liabilities | 392 | 677 |
Non-Current Liabilities | 2,060 | 810 |
Non-Controlling Interest in Operating Subsidiaries | 84 | 79 |
Partnership Capital | $ (2,165) | $ (558) |

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