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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of subsidiaries [line items] |  |  |
Current Assets | $ 3,711 | $ 5,841 |
Non-Current Assets | 57,620 | 50,467 |
Current Liabilities | 5,524 | 5,439 |
Non-Current Liabilities | 34,134 | 28,692 |
Disposal of investments in associates and joint ventures | 0 | 135 | $ 1,289
Non-Wholly Owned Subsidiaries |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 3,613 | 5,723 |
Non-Current Assets | 49,913 | 43,406 |
Current Liabilities | 5,317 | 5,265 |
Non-Current Liabilities | 32,480 | 27,184 |
Non-Controlling Interest in Operating Subsidiaries | 13,955 | 14,113 |
Partnership Capital | 1,774 | 2,567 |
U.K. regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 181 | 159 |
Non-Current Assets | 5,264 | 4,653 |
Current Liabilities | 333 | 294 |
Non-Current Liabilities | 3,241 | 2,888 |
Non-Controlling Interest in Operating Subsidiaries | 367 | 318 |
Partnership Capital | 1,504 | 1,312 |
Brazilian regulated gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 405 | 435 |
Non-Current Assets | 3,494 | 4,606 |
Current Liabilities | 203 | 199 |
Non-Current Liabilities | 2,772 | 3,195 |
Non-Controlling Interest in Operating Subsidiaries | 783 | 1,305 |
Partnership Capital | 141 | 342 |
Colombian natural gas distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 220 | 214 |
Non-Current Assets | 1,256 | 1,166 |
Current Liabilities | 248 | 299 |
Non-Current Liabilities | 478 | 314 |
Non-Controlling Interest in Operating Subsidiaries | 636 | 684 |
Partnership Capital | 114 | 83 |
Brazilian electricity transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 15 | 21 |
Non-Current Assets | 320 | 401 |
Current Liabilities | 11 | 12 |
Non-Current Liabilities | 196 | 252 |
Non-Controlling Interest in Operating Subsidiaries | 89 | 110 |
Partnership Capital | 39 | 48 |
Canadian district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 28 | 29 |
Non-Current Assets | 1,260 | 974 |
Current Liabilities | 147 | 47 |
Non-Current Liabilities | 567 | 506 |
Non-Controlling Interest in Operating Subsidiaries | 429 | 337 |
Partnership Capital | 145 | 113 |
U.S. district energy operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 38 | 37 |
Non-Current Assets | 1,097 | 964 |
Current Liabilities | 78 | 41 |
Non-Current Liabilities | 768 | 747 |
Non-Controlling Interest in Operating Subsidiaries | 163 | 118 |
Partnership Capital | 126 | 95 |
North American residential energy infrastructure operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 210 | 171 |
Non-Current Assets | 4,215 | 3,997 |
Current Liabilities | 436 | 337 |
Non-Current Liabilities | 2,321 | 1,925 |
Non-Controlling Interest in Operating Subsidiaries | 1,174 | 1,341 |
Partnership Capital | 494 | 565 |
Indian gas transmission operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 94 | 155 |
Non-Current Assets | 2,172 | 2,272 |
Current Liabilities | 131 | 181 |
Non-Current Liabilities | 1,308 | 910 |
Non-Controlling Interest in Operating Subsidiaries | 781 | 1,157 |
Partnership Capital | 46 | 179 |
Australian export terminal |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets |  | 139 |
Non-Current Assets |  | 1,994 |
Current Liabilities |  | 347 |
Non-Current Liabilities |  | 1,688 |
Non-Controlling Interest in Operating Subsidiaries |  | 34 |
Partnership Capital |  | 64 |
North American rail operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 504 | 2,150 |
Non-Current Assets | 9,569 | 9,392 |
Current Liabilities | 699 | 1,409 |
Non-Current Liabilities | 4,898 | 4,889 |
Non-Controlling Interest in Operating Subsidiaries | 4,032 | 4,747 |
Partnership Capital | 444 | 497 |
U.K. ports operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 62 | 47 |
Non-Current Assets | 1,105 | 934 |
Current Liabilities | 45 | 78 |
Non-Current Liabilities | 735 | 370 |
Non-Controlling Interest in Operating Subsidiaries | 157 | 218 |
Partnership Capital | 230 | 315 |
Australian port operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 151 | 126 |
Non-Current Assets | 863 | 927 |
Current Liabilities | 131 | 124 |
Non-Current Liabilities | 393 | 488 |
Non-Controlling Interest in Operating Subsidiaries | 352 | 317 |
Partnership Capital | 138 | 124 |
Chilean toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 126 | 95 |
Non-Current Assets | 835 | 821 |
Current Liabilities | 125 | 67 |
Non-Current Liabilities | 1,148 | 1,112 |
Non-Controlling Interest in Operating Subsidiaries | (335) | (320) |
Partnership Capital | 23 | 57 |
Peruvian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 105 | 122 |
Non-Current Assets | 1,247 | 1,337 |
Current Liabilities | 438 | 19 |
Non-Current Liabilities | 212 | 683 |
Non-Controlling Interest in Operating Subsidiaries | 591 | 638 |
Partnership Capital | 111 | 119 |
Indian toll roads |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 87 | 75 |
Non-Current Assets | 808 | 868 |
Current Liabilities | 177 | 83 |
Non-Current Liabilities | 426 | 570 |
Non-Controlling Interest in Operating Subsidiaries | 203 | 203 |
Partnership Capital | 89 | 87 |
North American gas storage operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 170 | 200 |
Non-Current Assets | 1,433 | 1,449 |
Current Liabilities | 67 | 112 |
Non-Current Liabilities | 658 | 661 |
Non-Controlling Interest in Operating Subsidiaries | 544 | 543 |
Partnership Capital | 334 | 333 |
Western Canadian natural gas gathering and processing operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 125 | 119 |
Non-Current Assets | 3,964 | 3,721 |
Current Liabilities | 131 | 147 |
Non-Current Liabilities | 2,072 | 1,845 |
Non-Controlling Interest in Operating Subsidiaries | 1,348 | 1,320 |
Partnership Capital | 538 | 528 |
U.S. data center operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 67 | 105 |
Non-Current Assets | 1,634 | 1,665 |
Current Liabilities | 95 | 112 |
Non-Current Liabilities | 1,138 | 1,130 |
Non-Controlling Interest in Operating Subsidiaries | 334 | 376 |
Partnership Capital | 134 | 152 |
Australian Data Center Operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 12 | 10 |
Non-Current Assets | 311 | 280 |
Current Liabilities | 127 | 5 |
Non-Current Liabilities | 7 | 112 |
Non-Controlling Interest in Operating Subsidiaries | 135 | 124 |
Partnership Capital | 54 | 49 |
U.K. telecom towers operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 32 | 26 |
Non-Current Assets | 896 | 874 |
Current Liabilities | 332 | 190 |
Non-Current Liabilities | 327 | 419 |
Non-Controlling Interest in Operating Subsidiaries | 203 | 219 |
Partnership Capital | 66 | 72 |
Indian telecom towers operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 392 |  |
Non-Current Assets | 7,998 |  |
Current Liabilities | 493 |  |
Non-Current Liabilities | 5,392 |  |
Non-Controlling Interest in Operating Subsidiaries | 1,917 |  |
Partnership Capital | 588 |  |
Holding LP and other |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets | 589 | 529 |
Non-Current Assets | 172 | 111 |
Current Liabilities | 870 | 735 |
Non-Current Liabilities | 3,423 | 2,480 |
Non-Controlling Interest in Operating Subsidiaries | 52 | 50 |
Partnership Capital | $ (3,584) | (2,625) |
Colombian regulated distribution operation |  |  |
Disclosure of subsidiaries [line items] |  |  |
Current Assets |  | 759 |
Non-Current Assets |  | 0 |
Current Liabilities |  | 427 |
Non-Current Liabilities |  | 0 |
Non-Controlling Interest in Operating Subsidiaries |  | 274 |
Partnership Capital |  | $ 58 |

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