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Financial Instruments - Carrying Amounts of Financial Instruments by Category (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost $ 2,745 $ 3,117  
Fair value through profit or loss 253 469  
Derivatives used for hedging 28 199  
Financial liabilities at amortized cost (26,228) (26,313)  
Total (23,202) (22,528)  
Lease liabilities 1,690 1,809  
Deferred purchase consideration payable $ 72 95 $ 118
Installment period 3 years    
Accounts payable      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost $ (667) (816)  
Financial liabilities (667) (816)  
Accrued liabilities      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost (2,346) (2,611)  
Financial liabilities (2,346) (2,611)  
Other long-term liabilities      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities, fair value through profit or loss (52) (21)  
Financial liabilities, derivatives used for hedging (108) (91)  
Financial liabilities at amortized cost (1,762) (1,904)  
Financial liabilities (1,922) (2,016)  
Long-term debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost (21,453) (20,982)  
Financial liabilities (21,453) (20,982)  
Accounts receivable      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 2,190 2,465  
Financial assets 2,190 2,465  
Investments      
Disclosure of detailed information about financial instruments [line items]      
Financial assets, fair value through profit or loss 305 490  
Financial assets 305 490  
Other long-term assets      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 555 652  
Financial assets, derivatives used for hedging 136 290  
Financial assets $ 691 $ 942