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NON-CONTROLLING INTERESTS - Narrative (Details)
Mar. 03, 2021
shares
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
TC PipeLines, LP        
Non-controlling interests        
Common shares issued to common unitholders 0.70      
Common shares issued (in shares) 37,955,093      
TC PipeLines, LP | Noncontrolling Interest | TC PipeLines, LP        
Non-controlling interests        
Percentage of non-controlling interests     74.50% 74.50%
PORTLAND NATURAL GAS TRANSMISSION SYSTEM | Noncontrolling Interest | TC PipeLines, LP        
Non-controlling interests        
Percentage of non-controlling interests   61.70%