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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Associates And Joint Ventures [Line Items] |  |
Current Assets | $ 3,711 | $ 5,841
Non-Current Assets | 57,620 | 50,467
Total assets | 61,331 | 56,308
Current Liabilities | 5,524 | 5,439
Non-Current Liabilities | 34,134 | 28,692
Total liabilities | 39,658 | 34,131
Total |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Current Assets | 2,948 | 3,189
Non-Current Assets | 51,725 | 42,291
Total assets | 54,673 | 45,480
Current Liabilities | 3,972 | 3,964
Non-Current Liabilities | 24,244 | 21,573
Total liabilities | 28,216 | 25,537
Total Net Assets | 26,457 | 19,943
Attributable to Other Ownership Interests | 20,929 | 14,976
Attributable to Partnership's Share | 5,528 | 4,967
Utilities |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Current Assets | 646 | 870
Non-Current Assets | 6,142 | 6,499
Total assets | 6,788 | 7,369
Current Liabilities | 487 | 686
Non-Current Liabilities | 4,238 | 4,152
Total liabilities | 4,725 | 4,838
Total Net Assets | 2,063 | 2,531
Attributable to Other Ownership Interests | 1,810 | 2,286
Attributable to Partnership's Share | 253 | 245
Transport |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Current Assets | 1,266 | 1,233
Non-Current Assets | 25,762 | 18,327
Total assets | 27,028 | 19,560
Current Liabilities | 1,959 | 1,948
Non-Current Liabilities | 9,836 | 8,444
Total liabilities | 11,795 | 10,392
Total Net Assets | 15,233 | 9,168
Attributable to Other Ownership Interests | 12,474 | 6,770
Attributable to Partnership's Share | 2,759 | 2,398
Midstream |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Current Assets | 173 | 166
Non-Current Assets | 6,392 | 5,696
Total assets | 6,565 | 5,862
Current Liabilities | 249 | 275
Non-Current Liabilities | 4,033 | 4,013
Total liabilities | 4,282 | 4,288
Total Net Assets | 2,283 | 1,574
Attributable to Other Ownership Interests | 911 | 307
Attributable to Partnership's Share | 1,372 | 1,267
Data |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Current Assets | 841 | 912
Non-Current Assets | 13,308 | 11,636
Total assets | 14,149 | 12,548
Current Liabilities | 1,263 | 1,042
Non-Current Liabilities | 6,081 | 4,908
Total liabilities | 7,344 | 5,950
Total Net Assets | 6,805 | 6,598
Attributable to Other Ownership Interests | 5,672 | 5,569
Attributable to Partnership's Share | 1,133 | 1,029
Corporate |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Current Assets | 22 | 8
Non-Current Assets | 121 | 133
Total assets | 143 | 141
Current Liabilities | 14 | 13
Non-Current Liabilities | 56 | 56
Total liabilities | 70 | 69
Total Net Assets | 73 | 72
Attributable to Other Ownership Interests | 62 | 44
Attributable to Partnership's Share | $ 11 | $ 28
North American natural gas transmission operation |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Ownership and voting Interest | 50.00% |
Loans and receivables | $ 500 |
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 | 6.00% | 11.00%
Bottom of range | Midstream |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Ownership and voting Interest | 20.00% | 20.00%
Bottom of range | Data |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Ownership and voting Interest | 12.00% | 12.00%
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% | 20.00%
Top of range | Transport |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Ownership and voting Interest | 50.00% | 50.00%
Top of range | Midstream |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Ownership and voting Interest | 50.00% | 50.00%
Top of range | Data |  |
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% | 50.00%

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