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Financial Instruments - Carrying Amounts of Financial Instruments by Category (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Financial assets at amortized cost $ 4,475 $ 3,855
Fair value through profit or loss 497 245
Derivatives used for hedging 0 119
Financial liabilities at amortized cost (18,535) (20,193)
Net financial assets (liabilities) (13,563) (15,974)
Lease liabilities 1,540 1,584
Accounts payable    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at amortized cost (1,341) (803)
Financial liabilities (1,341) (803)
Accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at amortized cost (4,209) (3,064)
Financial liabilities (4,209) (3,064)
Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, fair value through profit or loss (3) (64)
Financial liabilities, derivatives used for hedging   (21)
Financial liabilities at amortized cost (1,540) (1,632)
Financial liabilities (1,543) (1,717)
Long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at amortized cost (11,445) (14,694)
Financial liabilities (11,445) (14,694)
Cash and cash equivalents    
Disclosure of detailed information about financial instruments [line items]    
Financial assets at amortized cost 920 744
Financial assets 920 744
Accounts receivable    
Disclosure of detailed information about financial instruments [line items]    
Financial assets at amortized cost 3,555 3,111
Financial assets 3,555 3,111
Investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, fair value through profit or loss 491 309
Financial assets 491 309
Other long-term assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, fair value through profit or loss 9  
Financial assets, derivatives used for hedging   140
Financial assets $ 9 $ 140