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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