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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, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 01, 2021
shares
Oct. 01, 2021
shares
Aug. 01, 2021
shares
Jun. 30, 2021
$ / shares
Jul. 01, 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       2.1 8.1 17.9    
Preference Limited Partnership Units, Series 1                  
Disclosure of classes of share capital [line items]                  
Quarterly distribution rate (as a percent)               4.50% 3.974%
Quarterly distribution (usd per share)               $ 0.2813 $ 0.2484
Special General Partner                  
Disclosure of classes of share capital [line items]                  
Dividends recognised as incentive distributions to owners | $   $ 206 $ 183 $ 158