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financial instruments - Fair values Non-derivative (Details) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
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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Total long-term borrowings, including the current and non-current portion.

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