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DISTRIBUTIONS (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 08, 2018
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 764 | $ 615 | $ 543 |
Preferred Unitholders Capital |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 30 | 13 | 3 |
Partnership distributions (usd per share) | $ 0.94 |  |  |
Subsequent Event |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Increase in dividends payable per share, percent |  |  |  | 8.00%
Quarterly distribution (usd per share) |  |  |  | $ 0.47
Partnership Unitholders Excluding Special General Partner |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 651 | $ 535 | $ 479 |
Partnership distributions (usd per share) | $ 1.74 | $ 1.55 | $ 1.41 |
Special General Partner |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 113 | $ 80 | $ 64 |

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