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DISTRIBUTIONS - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2020
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 01, 2020
$ / shares
Jun. 30, 2020
$ / shares
Disclosure of classes of share capital [line items]            
Partnership distributions (usd per share) $ 0.5375          
Exchangeable shares issued as a result of special distribution | shares 46.3          
Class A Preference Limited Partnership Units, Series 1            
Disclosure of classes of share capital [line items]            
Quarterly distribution rate (as a percent)         3.974% 4.50%
Quarterly distribution (usd per share)         $ 0.2484 $ 0.2813
Special General Partner            
Disclosure of classes of share capital [line items]            
Dividends recognised as incentive distributions to owners | $   $ 183 $ 158 $ 136