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DISTRIBUTIONS - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2019 $ / shares | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2020 $ / shares shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Dividends recognised as incentive distributions to owners | $ | $ 46 |  | $ 92 |  |  |
Quarterly Dividends Recognised As Distributions To Owners Per Share |  |  |  |  |  | $ 0.5375
Preferred Unitholders Capital [Member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Quarterly Fixed Distribution Rate |  |  | 4.50% |  |  |
Dividends recognised as distributions to owners per share | $ 0.24 | $ 0.26 | $ 0.48 |  | $ 0.50 |
Non-controlling Interest - Class A Shares, equity [Member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  | 46.3
Dividends recognised as distributions to owners per share | $ 0.485 | $ 0.452 | $ 0.970 |  | $ 0.904 |
Canada, Dollars | Preferred Unitholders Capital [Member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Dividends recognised as distributions to owners per share |  |  |  | $ 0.2813 |  |
Pro Forma [Member] | Preferred Unitholders Capital [Member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Quarterly Fixed Distribution Rate |  |  | 3.974% |  |  |
Pro Forma [Member] | Canada, Dollars | Preferred Unitholders Capital [Member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Dividends recognised as distributions to owners per share |  |  |  | $ 0.2484 |  |

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