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Net Interest Expense (Details) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Analysis of income and expense [abstract]
Interest on debt	CAD 218	CAD 218	CAD 218
Interest income	(7)	(2)	(2)
Capitalized interest (Note 16)	(9)	(16)	(9)
Loss on redemption of bonds (Note 4(F))	6	1	0
Interest on finance lease obligations	3	3	4
Credit facility fees, bank charges, and other interest	18	19	10
Keephills 1 outage interest accruals (reversals) (Note 4)	0	(10)	9
Other	(3)	(4)	0
Accretion of provisions (Note 20)	21	20	21
Net interest expense	CAD 247	CAD 229	CAD 251

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The gain (loss) arising from the difference between the carrying amount of the financial liability extinguished and the measurement of the consideration paid (equity instruments issued) to the creditor. [Refer: Carrying amount [member]]

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The increase in other provisions through adjustments arising from the passage of time. [Refer: Other provisions]

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The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset.

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The amount of interest costs that an entity incurs.

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The amount of expense arising from interest.

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The amount of interest expense on finance leases. [Refer: Interest expense]

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The amount of income arising from interest.

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