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CAPITAL RISK MANAGEMENT - Narrative (Details)
Dec. 31, 2023
CAD ($)
Apr. 30, 2023
CAD ($)
Apr. 03, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about business combination [line items]          
Current portion of long-term debt $ 1,100,000,000     $ 1,828,000,000  
Short-term borrowings 1,750,000,000     2,985,000,000  
Total 7,943,000,000     7,938,000,000  
Restricted cash and cash equivalents $ 0     12,837,000,000  
Debt-Leverage Ratio, Target 3.5        
Letters of Credit          
Disclosure of detailed information about business combination [line items]          
Maximum borrowing capacity $ 243,000,000     75,000,000  
Non-revolving credit facility borrowings          
Disclosure of detailed information about business combination [line items]          
Maximum borrowing capacity 500,000,000     1,000,000,000  
Short-term borrowings $ 0     $ 371,000,000 $ 507,000,000
Shaw Communications Inc.          
Disclosure of detailed information about business combination [line items]          
Maximum borrowing capacity     $ 6,000,000,000    
Fair value of consideration transferred     20,483,000,000    
Borrowings recognised as of acquisition date   $ 4,550,000,000 $ 4,550,000,000