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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of subsidiaries [line items] |  |  |
Current Assets | $ 2,276 | $ 1,512 | $ 1,632
Non-Current Assets | 34,304 | 27,965 | 19,643
Current Liabilities | 2,417 | 1,564 | 1,515
Non-Current Liabilities | 19,495 | 14,439 | $ 10,116
Non-Wholly Owned Subsidiaries |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 2,188 | 1,430 |
Non-Current Assets | 27,349 | 19,770 |
Current Liabilities | 2,325 | 1,465 |
Non-Current Liabilities | 17,878 | 12,699 |
Non-Controlling Interest in Operating Subsidiaries | 7,305 | 5,873 |
Partnership Capital | 2,029 | 1,163 |
U.K. regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 131 | 107 |
Non-Current Assets | 3,844 | 3,550 |
Current Liabilities | 248 | 281 |
Non-Current Liabilities | 2,452 | 2,261 |
Non-Controlling Interest in Operating Subsidiaries | 247 | 217 |
Partnership Capital | 1,028 | 898 |
Australian regulated terminal operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 34 | 38 |
Non-Current Assets | 2,074 | 2,229 |
Current Liabilities | 27 | 34 |
Non-Current Liabilities | 1,943 | 2,035 |
Non-Controlling Interest in Operating Subsidiaries | 45 | 62 |
Partnership Capital | 93 | 136 |
Colombian regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 51 | 68 |
Non-Current Assets | 708 | 764 |
Current Liabilities | 32 | 26 |
Non-Current Liabilities | 396 | 438 |
Non-Controlling Interest in Operating Subsidiaries | 273 | 302 |
Partnership Capital | 58 | 66 |
Brazilian regulated gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 310 | 322 |
Non-Current Assets | 4,955 | 5,990 |
Current Liabilities | 106 | 73 |
Non-Current Liabilities | 3,185 | 2,015 |
Non-Controlling Interest in Operating Subsidiaries | 1,540 | 3,081 |
Partnership Capital | 434 | 1,143 |
Colombian Gas Distribution Operation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 230 |  |
Non-Current Assets | 1,149 |  |
Current Liabilities | 235 |  |
Non-Current Liabilities | 374 |  |
Non-Controlling Interest in Operating Subsidiaries | 691 |  |
Partnership Capital | 79 |  |
U.K. port operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 48 | 44 |
Non-Current Assets | 847 | 880 |
Current Liabilities | 71 | 133 |
Non-Current Liabilities | 347 | 353 |
Non-Controlling Interest in Operating Subsidiaries | 195 | 179 |
Partnership Capital | 282 | 259 |
Australian port operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 141 | 163 |
Non-Current Assets | 593 | 628 |
Current Liabilities | 239 | 101 |
Non-Current Liabilities | 59 | 218 |
Non-Controlling Interest in Operating Subsidiaries | 319 | 346 |
Partnership Capital | 117 | 126 |
Chilean toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 82 | 84 |
Non-Current Assets | 940 | 1,116 |
Current Liabilities | 59 | 59 |
Non-Current Liabilities | 862 | 989 |
Non-Controlling Interest in Operating Subsidiaries | 43 | 75 |
Partnership Capital | 58 | 77 |
Peruvian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 104 | 101 |
Non-Current Assets | 1,308 | 1,356 |
Current Liabilities | 20 | 18 |
Non-Current Liabilities | 654 | 674 |
Non-Controlling Interest in Operating Subsidiaries | 622 | 644 |
Partnership Capital | 116 | 121 |
Indian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 90 | 58 |
Non-Current Assets | 975 | 256 |
Current Liabilities | 65 | 30 |
Non-Current Liabilities | 667 | 185 |
Non-Controlling Interest in Operating Subsidiaries | 229 | 60 |
Partnership Capital | 104 | 39 |
North American gas storage operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 281 | 206 |
Non-Current Assets | 1,273 | 1,259 |
Current Liabilities | 155 | 244 |
Non-Current Liabilities | 566 | 409 |
Non-Controlling Interest in Operating Subsidiaries | 515 | 502 |
Partnership Capital | 318 | 310 |
Canadian district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 25 | 75 |
Non-Current Assets | 754 | 699 |
Current Liabilities | 32 | 55 |
Non-Current Liabilities | 387 | 394 |
Non-Controlling Interest in Operating Subsidiaries | 269 | 243 |
Partnership Capital | 91 | 82 |
U.S. district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 42 | 37 |
Non-Current Assets | 834 | 799 |
Current Liabilities | 26 | 19 |
Non-Current Liabilities | 681 | 668 |
Non-Controlling Interest in Operating Subsidiaries | 90 | 78 |
Partnership Capital | 79 | 71 |
Western Canadian Natural Gas Gathering and Processing Operation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 86 |  |
Non-Current Assets | 2,069 |  |
Current Liabilities | 84 |  |
Non-Current Liabilities | 1,161 |  |
Non-Controlling Interest in Operating Subsidiaries | 650 |  |
Partnership Capital | 260 |  |
North American Residential Energy Infrastructure Operation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 196 |  |
Non-Current Assets | 3,647 |  |
Current Liabilities | 152 |  |
Non-Current Liabilities | 1,551 |  |
Non-Controlling Interest in Operating Subsidiaries | 1,506 |  |
Partnership Capital | 634 |  |
U.S. Data Center Operation [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 17 |  |
Non-Current Assets | 1,131 |  |
Current Liabilities | 438 |  |
Non-Current Liabilities | 562 |  |
Non-Controlling Interest in Operating Subsidiaries | (12) |  |
Partnership Capital | 160 |  |
Holding LP and other |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 320 | 127 |
Non-Current Assets | 248 | 244 |
Current Liabilities | 336 | 392 |
Non-Current Liabilities | 2,031 | 2,060 |
Non-Controlling Interest in Operating Subsidiaries | 83 | 84 |
Partnership Capital | $ (1,882) | $ (2,165) |

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