NET FINANCE COSTS (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Interest expense on financial liabilities measured at amortized cost:
Loans and borrowings	$ 268	$ 162
Convertible debentures	6	9
Unwinding of discount rate	12	12
Gain in fair value of non-commodity-related derivative financial instruments	(4)	(8)
Loss on revaluation of conversion feature of convertible debentures	0	13
Foreign exchange gain and other	(3)	(3)
Net finance costs	$ 279	$ 185

The amount of expense recognised due to the unwinding of the discount on provisions, resulting from the effect of the passage of time. [Refer: Other provisions]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of income or cost associated with interest and other financing activities of the entity.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, net of tax. [Refer: Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The gains resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

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The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

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The amount of interest expense on debt instruments issued. [Refer: Interest expense; Debt instruments issued]

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Gains (Losses) On Revaluation Of Conversion Feature Of Convertible Debentures

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