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Fair Value Measurements (Assets and Liabilities Not Measured at Fair Value ) (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value Measurement [Domain] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | $ (16,487) | $ (16,049)
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 | (16,020) | (15,598)
Fair Value Measurement [Domain] | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | (467) | (451)
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | (13,721) | (14,180)
Financial assets and liabilities | $ (16,487) | $ (16,049)

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- Definition Fair value of asset after deduction of liability. + References No definition available. + Details
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