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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | $ 1,512 | $ 1,632 | $ 1,553
Non-Current Assets | 27,965 | 19,643 | 16,182
Total assets | 29,477 | 21,275 | 17,735
Current Liabilities | 1,564 | 1,515 | 1,210
Non-Current Liabilities | 14,439 | 10,116 | 9,349
Total liabilities | 16,003 | 11,631 | $ 10,559
Associates and Joint Ventures |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 2,822 | 1,925 |
Non-Current Assets | 37,553 | 33,509 |
Total assets | 40,375 | 35,434 |
Current Liabilities | 2,887 | 4,016 |
Non-Current Liabilities | 17,688 | 15,053 |
Total liabilities | 20,575 | 19,069 |
Total Net Assets | 19,800 | 16,365 |
Attributable to Other Ownership Interests | 14,228 | 11,638 |
Attributable to Partnership's Share | 5,572 | 4,727 |
Brazilian toll roads |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 304 | 263 |
Non-Current Assets | 5,769 | 4,977 |
Total assets | 6,073 | 5,240 |
Current Liabilities | 602 | 823 |
Non-Current Liabilities | 2,102 | 1,665 |
Total liabilities | 2,704 | 2,488 |
Total Net Assets | 3,369 | 2,752 |
Attributable to Other Ownership Interests | 1,654 | 1,247 |
Attributable to Partnership's Share | 1,715 | 1,505 |
North American natural gas transmission operation |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 139 | 122 |
Non-Current Assets | 4,741 | 5,767 |
Total assets | 4,880 | 5,889 |
Current Liabilities | 139 | 1,353 |
Non-Current Liabilities | 2,716 | 2,925 |
Total liabilities | 2,855 | 4,278 |
Total Net Assets | 2,025 | 1,611 |
Attributable to Other Ownership Interests | 1,012 | 805 |
Attributable to Partnership's Share | 1,013 | 806 |
Chilean electricity transmission operation |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 280 | 221 |
Non-Current Assets | 7,122 | 5,519 |
Total assets | 7,402 | 5,740 |
Current Liabilities | 181 | 142 |
Non-Current Liabilities | 3,874 | 3,234 |
Total liabilities | 4,055 | 3,376 |
Total Net Assets | 3,347 | 2,364 |
Attributable to Other Ownership Interests | 2,417 | 1,665 |
Attributable to Partnership's Share | 930 | 699 |
European telecommunications infrastructure operation |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 464 | 328 |
Non-Current Assets | 6,281 | 5,437 |
Total assets | 6,745 | 5,765 |
Current Liabilities | 561 | 443 |
Non-Current Liabilities | 2,968 | 2,528 |
Total liabilities | 3,529 | 2,971 |
Total Net Assets | 3,216 | 2,794 |
Attributable to Other Ownership Interests | 2,602 | 2,258 |
Attributable to Partnership's Share | 614 | 536 |
Brazilian rail business |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 743 | 460 |
Non-Current Assets | 6,131 | 5,265 |
Total assets | 6,874 | 5,725 |
Current Liabilities | 515 | 674 |
Non-Current Liabilities | 2,405 | 1,645 |
Total liabilities | 2,920 | 2,319 |
Total Net Assets | 3,954 | 3,406 |
Attributable to Other Ownership Interests | 3,518 | 3,030 |
Attributable to Partnership's Share | 436 | 376 |
Australian port operation |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 198 | 171 |
Non-Current Assets | 2,281 | 2,166 |
Total assets | 2,479 | 2,337 |
Current Liabilities | 24 | 66 |
Non-Current Liabilities | 1,332 | 1,229 |
Total liabilities | 1,356 | 1,295 |
Total Net Assets | 1,123 | 1,042 |
Attributable to Other Ownership Interests | 932 | 861 |
Attributable to Partnership's Share | 191 | 181 |
Other |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 694 | 360 |
Non-Current Assets | 5,228 | 4,378 |
Total assets | 5,922 | 4,738 |
Current Liabilities | 865 | 515 |
Non-Current Liabilities | 2,291 | 1,827 |
Total liabilities | 3,156 | 2,342 |
Total Net Assets | 2,766 | 2,396 |
Attributable to Other Ownership Interests | 2,093 | 1,772 |
Attributable to Partnership's Share | $ 673 | $ 624 |

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