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Risk Management - Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accounts payable and accrued liabilities [member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments $ 2,018 $ 2,229
Accounts payable and accrued liabilities [member] | Less Than 1 Year [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 2,018 2,229
Short-term Borrowings [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 121  
Short-term Borrowings [Member] | Less Than 1 Year [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 121  
Long-term Borrowings [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 12,943 12,473
Long-term Borrowings [Member] | Less Than 1 Year [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 385 344
Long-term Borrowings [Member] | Years 2 and 3 [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 1,965 1,338
Long-term Borrowings [Member] | Years 4 and 5 [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 1,966 1,465
Long-term Borrowings [Member] | Thereafter [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 8,627 9,326
Contingent Payment ([Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 64 148
Contingent Payment ([Member] | Less Than 1 Year [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 36 79
Contingent Payment ([Member] | Years 2 and 3 [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 28 69
Lease liabilities [member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 2,476 2,697
Lease liabilities [member] | Less Than 1 Year [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 254 277
Lease liabilities [member] | Years 2 and 3 [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 445 466
Lease liabilities [member] | Years 4 and 5 [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 365 410
Lease liabilities [member] | Thereafter [Member]    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments $ 1,412 $ 1,544