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Risk Management - Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Accounts payable and accrued liabilities    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments $ 6,435 $ 6,124
Accounts payable and accrued liabilities | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 6,435 6,124
Accounts payable and accrued liabilities | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 0
Accounts payable and accrued liabilities | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 0
Accounts payable and accrued liabilities | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 0
Short-Term Borrowings    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 14 115
Short-Term Borrowings | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 14 115
Short-Term Borrowings | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 0
Short-Term Borrowings | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 0
Short-Term Borrowings | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 0
Lease Liabilities    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 4,456 4,657
Lease Liabilities | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 445 426
Lease Liabilities | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 734 746
Lease Liabilities | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 577 596
Lease Liabilities | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 2,700 2,889
Long-Term Debt    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 11,535 14,594
Long-Term Debt | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 318 401
Long-Term Debt | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 807 983
Long-Term Debt | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 3,038 2,014
Long-Term Debt | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 7,372 11,196
Contingent Payment    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 300 438
Contingent Payment | Remainder of Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 300 271
Contingent Payment | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 167
Contingent Payment | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 0
Contingent Payment | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments $ 0 $ 0