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Risk Management - Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts Payables And Accrued Liabilities |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | $ 5,480 | $ 6,124
Accounts Payables And Accrued Liabilities | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 5,480 | 6,124
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 | 179 | 115
Short-Term Borrowings | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 179 | 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 | 4,354 | 4,657
Lease Liabilities | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 438 | 426
Lease Liabilities | Years 2 and 3 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 712 | 746
Lease Liabilities | Years 4 and 5 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 569 | 596
Lease Liabilities | Thereafter |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 2,635 | 2,889
Long-Term Debt |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 11,257 | 14,594
Long-Term Debt | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 313 | 401
Long-Term Debt | Years 2 and 3 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 792 | 983
Long-Term Debt | Years 4 and 5 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 3,007 | 2,014
Long-Term Debt | Thereafter |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 7,145 | 11,196
Contingent Payments |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 168 | 438
Contingent Payments | 1 Year |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 168 | 271
Contingent Payments | Years 2 and 3 |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 0 | 167
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

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