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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

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