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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | $ 2,276 | $ 1,512 | $ 1,632
Non-Current Assets | 34,304 | 27,965 | 19,643
Total assets | 36,580 | 29,477 | 21,275
Current Liabilities | 2,417 | 1,564 | 1,515
Non-Current Liabilities | 19,495 | 14,439 | 10,116
Total liabilities | 21,912 | 16,003 | $ 11,631
Associates and Joint Ventures |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 2,539 | 2,822 |
Non-Current Assets | 30,504 | 37,553 |
Total assets | 33,043 | 40,375 |
Current Liabilities | 2,900 | 2,887 |
Non-Current Liabilities | 13,670 | 17,688 |
Total liabilities | 16,570 | 20,575 |
Total Net Assets | 16,473 | 19,800 |
Attributable to Other Ownership Interests | 11,882 | 14,228 |
Attributable to Partnership's Share | 4,591 | 5,572 |
Utilities |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 289 | 631 |
Non-Current Assets | 2,227 | 9,068 |
Total assets | 2,516 | 9,699 |
Current Liabilities | 325 | 756 |
Non-Current Liabilities | 1,391 | 4,892 |
Total liabilities | 1,716 | 5,648 |
Total Net Assets | 800 | 4,051 |
Attributable to Other Ownership Interests | 708 | 3,037 |
Attributable to Partnership's Share | 92 | 1,014 |
Transport |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 1,520 | 1,548 |
Non-Current Assets | 15,892 | 17,096 |
Total assets | 17,412 | 18,644 |
Current Liabilities | 1,876 | 1,396 |
Non-Current Liabilities | 6,447 | 7,002 |
Total liabilities | 8,323 | 8,398 |
Total Net Assets | 9,089 | 10,246 |
Attributable to Other Ownership Interests | 6,592 | 7,385 |
Attributable to Partnership's Share | 2,497 | 2,861 |
Energy |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 178 | 164 |
Non-Current Assets | 5,307 | 5,054 |
Total assets | 5,485 | 5,218 |
Current Liabilities | 162 | 162 |
Non-Current Liabilities | 2,875 | 2,784 |
Total liabilities | 3,037 | 2,946 |
Total Net Assets | 2,448 | 2,272 |
Attributable to Other Ownership Interests | 1,265 | 1,196 |
Attributable to Partnership's Share | 1,183 | 1,076 |
Data Infrastructure [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 447 | 464 |
Non-Current Assets | 6,692 | 6,281 |
Total assets | 7,139 | 6,745 |
Current Liabilities | 438 | 561 |
Non-Current Liabilities | 2,902 | 2,968 |
Total liabilities | 3,340 | 3,529 |
Total Net Assets | 3,799 | 3,216 |
Attributable to Other Ownership Interests | 3,089 | 2,602 |
Attributable to Partnership's Share | 710 | 614 |
Corporate |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current Assets | 105 | 15 |
Non-Current Assets | 386 | 54 |
Total assets | 491 | 69 |
Current Liabilities | 99 | 12 |
Non-Current Liabilities | 55 | 42 |
Total liabilities | 154 | 54 |
Total Net Assets | 337 | 15 |
Attributable to Other Ownership Interests | 228 | 8 |
Attributable to Partnership's Share | $ 109 | $ 7 |
Bottom of range | Utilities |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 11.00% | 11.00% |
Bottom of range | Transport |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 11.00% | 11.00% |
Bottom of range | Energy |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 20.00% | 20.00% |
Bottom of range | Data Infrastructure [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 21.00% | 21.00% |
Bottom of range | Corporate |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 25.00% | 25.00% |
Top of range | Utilities |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 20.00% | 28.00% |
Top of range | Transport |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 50.00% | 50.00% |
Top of range | Energy |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 50.00% | 50.00% |
Top of range | Data Infrastructure [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 21.00% | 21.00% |
Top of range | Corporate |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Ownership and Voting Interest | 50.00% | 40.00% |

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