REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Revenue From Contracts With Customers [Abstract]
Balance at January 1	$ 157	$ 81
Additions (net in the period)	38	99
Revenue recognized from contract liabilities	(27)	(23)
Closing balance	168	157
Less current portion	(37)	(44)
Balance at December 31	$ 131	$ 113

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard
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Balance Type:	credit
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- Definition

The amount of current contract liabilities. [Refer: Contract liabilities]

+ References

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- Definition

The decrease in contract liabilities resulting from the performance obligation being satisfied. [Refer: Contract liabilities; Performance obligations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

The increase (decrease) in contract liabilities resulting from cumulative catch-up adjustments to revenue. [Refer: Contract liabilities; Revenue]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 118
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118_b&doctype=Standard
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- Definition

The amount of non-current contract liabilities. [Refer: Contract liabilities]

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- Definition

Revenue From Contracts With Customers [Abstract]

+ References

No definition available.

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