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Fair Values (Assets and Liabilities Not Measured at Fair Value ) (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Measurement [Domain] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | $ (16,049) | $ (15,908)
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 | (15,598) | (14,991)
Fair Value Measurement [Domain] | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | (451) | (917)
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial assets and liabilities | (14,180) | (15,411)
Financial assets and liabilities | $ (16,049) | $ (15,908)

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