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FV Measurements (Financial Liabilities not Measured at Fair Value on Consolidated Balance Sheets) (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value Measurement [Domain] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | $ 17,941 | $ 16,621
Fair Value Measurement [Domain] | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | 0 | 0
Fair Value Measurement [Domain] | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | 17,688 | 16,363
Fair Value Measurement [Domain] | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | 253 | 258
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | 18,407 | 18,365
Financial assets and liabilities | $ 17,941 | $ 16,621

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