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Risk Management - Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Accounts payable and accrued liabilities    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments $ 7,487 $ 6,353
Accounts payable and accrued liabilities | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 7,487 6,353
Short-Term Borrowings    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments   79
Short-Term Borrowings | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments   79
Long-Term Debt    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 18,290 19,664
Long-Term Debt | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 528 561
Long-Term Debt | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 1,056 1,608
Long-Term Debt | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 3,834 2,603
Long-Term Debt | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 12,872 14,892
Contingent Payment    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments   238
Contingent Payment | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments   238
Contingent Payment | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments   0
Lease Liabilities    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 4,880 5,073
Lease Liabilities | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 443 453
Lease Liabilities | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 769 794
Lease Liabilities | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 617 634
Lease Liabilities | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments $ 3,051 $ 3,192