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Financial Instruments - Carrying Amounts of Financial Instruments by Category (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost $ 3,117,000,000 $ 1,739,000,000  
Fair value through profit or loss 469,000,000 519,000,000  
Derivatives used for hedging 199,000,000 361,000,000  
Financial liabilities at amortized cost (26,313,000,000) (23,876,000,000)  
Total (22,528,000,000) (21,257,000,000)  
Lease liabilities 1,809,000,000 0 $ 1,539,000,000
Deferred purchase consideration payable $ 95,000,000 $ 118,000,000  
Installment period 4 years 4 years  
Accounts payable      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost $ (816,000,000) $ (779,000,000)  
Financial liabilities (816,000,000) (779,000,000)  
Accrued liabilities      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost (2,611,000,000) (2,356,000,000)  
Financial liabilities (2,611,000,000) (2,356,000,000)  
Other long-term liabilities      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities, fair value through profit or loss (21,000,000) (17,000,000)  
Financial liabilities, derivatives used for hedging (91,000,000) 0  
Financial liabilities at amortized cost (1,904,000,000) (118,000,000)  
Financial liabilities (2,016,000,000) (135,000,000)  
Long-term debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at amortized cost (20,982,000,000) (20,623,000,000)  
Financial liabilities (20,982,000,000) (20,623,000,000)  
Accounts receivable      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 2,465,000,000 1,148,000,000  
Financial assets 2,465,000,000 1,148,000,000  
Investments      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 0 0  
Financial assets, fair value through profit or loss 490,000,000 524,000,000  
Financial assets 490,000,000 524,000,000  
Other long-term assets      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at amortized cost 652,000,000 591,000,000  
Financial assets, fair value through profit or loss 0 12,000,000  
Financial assets, derivatives used for hedging 290,000,000 361,000,000  
Financial assets $ 942,000,000 $ 964,000,000