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Risk Management - Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Accounts Payables And Accrued Liabilities |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | $ 6,242 | $ 5,480
Accounts Payables And Accrued Liabilities | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 6,242 | 5,480
Accounts Payables And Accrued Liabilities | Years 2 and 3 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 0 | 0
Accounts Payables And Accrued Liabilities | Years 4 and 5 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 0 | 0
Accounts Payables 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 | 173 | 179
Short-Term Borrowings | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 173 | 179
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
Contingent Payments |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments |  | 168
Contingent Payments | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments |  | 168
Contingent Payments | Years 2 and 3 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments |  | 0
Contingent Payments | Years 4 and 5 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments |  | 0
Contingent Payments | Thereafter |  |
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 | 4,613 | 4,354
Lease Liabilities | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 538 | 438
Lease Liabilities | Years 2 and 3 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 824 | 712
Lease Liabilities | Years 4 and 5 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 645 | 569
Lease Liabilities | Thereafter |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 2,606 | 2,635
Long-Term Debt |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 11,711 | 11,257
Long-Term Debt | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 526 | 313
Long-Term Debt | Years 2 and 3 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 1,910 | 792
Long-Term Debt | Years 4 and 5 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 1,989 | 3,007
Long-Term Debt | Thereafter |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | $ 7,286 | $ 7,145

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