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Risk Management - Undiscounted Cash Outflows Relating to Financial Liabilities (Details)
$ in Millions
Sep. 30, 2025
CAD ($)
Accounts payable and accrued liabilities  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments $ 5,216
Accounts payable and accrued liabilities | Less than 1 Year  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 5,216
Accounts payable and accrued liabilities | Years 2 and 3  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 0
Accounts payable and accrued liabilities | Years 4 and 5  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 0
Accounts payable and accrued liabilities | 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 4,437
Lease Liabilities | Less than 1 Year  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 490
Lease Liabilities | Years 2 and 3  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 860
Lease Liabilities | Years 4 and 5  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 643
Lease Liabilities | Thereafter  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 2,444
Long-Term Debt  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 10,972
Long-Term Debt | Less than 1 Year  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 316
Long-Term Debt | Years 2 and 3  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 3,066
Long-Term Debt | Years 4 and 5  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments 688
Long-Term Debt | Thereafter  
Disclosure of Maturity Analysis for Financial Liabilities [Line Items]  
Financial instruments $ 6,902