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CAPITAL RISK MANAGEMENT - Narrative (Details) - CAD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2022
Mar. 15, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about business combination [line items]        
Current portion of long-term debt $ 1,828   $ 1,551  
Short-term borrowings 2,985   2,200  
Total 7,938   6,494  
Restricted cash and cash equivalents 12,837   0  
Non-revolving credit facility borrowings        
Disclosure of detailed information about business combination [line items]        
Short-term borrowings $ 371   $ 507 $ 0
Shaw        
Disclosure of detailed information about business combination [line items]        
Price per share (in USD per share)   $ 40.50    
Borrowings recognised as of acquisition date   $ 6,000