NET FINANCE COSTS (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Interest expense on financial liabilities measured at amortized cost:
Loans and borrowings	$ 291	$ 268
Convertible debentures	0	6
Leases	17	0
Unwinding of discount rate	13	12
Finance lease income	(1)	0
Loss in fair value of non-commodity-related derivative financial instruments	(4)	(4)
Gains (Losses) on Exchange Differences on Translation and Other, Net of Tax	22	3
Net finance costs	$ 294	$ 279

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
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2019-03-27

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 85
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- Definition

The amount of finance income on the net investment in the finance lease. [Refer: Finance income; Net investment in finance lease]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 90
-Subparagraph a
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_90_a_ii&doctype=Standard
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- Definition

The gains resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

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- References

No definition available.

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- Definition

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

+ References

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Data Type:	xbrli:monetaryItemType
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- Definition

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

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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
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- Definition

Gains (Losses) on Exchange Differences on Translation and Other, Net of Tax

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No definition available.

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