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Risk Management - Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Accounts Payable and Accrued Liabilities    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments $ 6,124 $ 6,353
Accounts Payable and Accrued Liabilities | 1 Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 6,124 6,353
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
Long-Term Debt    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 14,594 19,664
Long-Term Debt | 1 Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 401 561
Long-Term Debt | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 983 1,608
Long-Term Debt | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 2,014 2,603
Long-Term Debt | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 11,196 14,892
Contingent Payments    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 438 238
Contingent Payments | 1 Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 271 238
Contingent Payments | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 167 0
Contingent Payments | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 0 0
Contingent Payments | 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 4,657 5,073
Lease Liabilities | 1 Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 426 453
Lease Liabilities | Years 2 and 3    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 746 794
Lease Liabilities | Years 4 and 5    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 596 634
Lease Liabilities | Thereafter    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 2,889 3,192
Short-Term Borrowings    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 115 79
Short-Term Borrowings | 1 Year    
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]    
Financial instruments 115 79
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