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Risk Management - Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accounts payable and accrued liabilities    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments $ 5,735 $ 2,018
Accounts payable and accrued liabilities | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 5,735 2,018
Short-Term Borrowings    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 48 121
Short-Term Borrowings | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 48 121
Long-Term Debt    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 20,466 12,943
Long-Term Debt | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 1,124 385
Long-Term Debt | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 1,621 1,965
Long-Term Debt | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 2,612 1,966
Long-Term Debt | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 15,109 8,627
Contingent Payment    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 396 64
Contingent Payment | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 396 36
Contingent Payment | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 28
Lease Liabilities    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 5,034 2,476
Lease Liabilities | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 448 254
Lease Liabilities | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 782 445
Lease Liabilities | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 628 365
Lease Liabilities | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments $ 3,176 $ 1,412