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NON-CONTROLLING INTERESTS - Business Acquisition and its Effect on the Balance Sheet (Details) - CAD ($)
$ in Millions
Mar. 03, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Non-controlling interests          
Common shares   $ 28,995 $ 26,716    
Common shares          
Non-controlling interests          
Common shares   $ 28,995 $ 26,716 $ 24,488 $ 24,387
TC PipeLines, LP          
Non-controlling interests          
Deferred income tax liabilities $ (443)        
Other (12)        
TC PipeLines, LP | Common shares          
Non-controlling interests          
Common shares 2,063        
TC PipeLines, LP | Additional Paid-In Capital          
Non-controlling interests          
Noncontrolling interest, fair value (398)        
TC PipeLines, LP | AOCI Attributable to Parent          
Non-controlling interests          
Noncontrolling interest, fair value 353        
TC PipeLines, LP | Equity Attributable to Non-Controlling Interests          
Non-controlling interests          
Noncontrolling interest, fair value $ (1,563)