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DISTRIBUTIONS (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 05, 2019
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 878 | $ 764 | $ 615 |
Preferred Unitholders Capital |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 41 | 30 | 13 |
Partnership distributions (usd per share) | $ 0.97 |  |  |
Subsequent Event |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Increase in dividends payable per share, percent |  |  |  | 7.00%
Quarterly distribution (usd per share) |  |  |  | $ 0.5025
Partnership Unitholders Excluding Special General Partner |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 742 | $ 651 | $ 535 |
Partnership distributions (usd per share) | $ 1.88 | $ 1.74 | $ 1.55 |
Special General Partner |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 136 | $ 113 | $ 80 |

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