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financial instruments - Fair values Non-derivative (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about financial instruments |  |
Long-term debt | $ 14,101 | $ 13,660
Measured at amortized cost but fair value disclosed |  |
Disclosure of detailed information about financial instruments |  |
Long-term debt | 14,209 | 14,255
Carrying value |  |
Disclosure of detailed information about financial instruments |  |
Long-term debt | $ 14,101 | $ 13,660

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