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DISTRIBUTIONS (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ (219) | $ (188) | $ (438) | $ (376)
Preferred Unitholders Capital [Member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 10 | $ 8 | $ 19 | $ 14
Partnership distributions (usd per share) | $ 0.25 | $ 0.25 | $ 0.48 | $ 0.49
Partnership Unitholders Excluding Special General Partner |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 185 | $ 160 | $ 370 | $ 320
Partnership distributions (usd per share) | $ 0.47 | $ 0.435 | $ 0.94 | $ 0.87
Increase in dividends payable per share, percent | 8.00% |  | 8.00% |
Special General Partner |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Partnership distributions | $ 34 | $ 28 | $ 68 | $ 56

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