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share-based compensation - Expense (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
share-based compensation
Employee benefits expense	$ 141	$ 121
Associated operating cash outflows	(135)	(104)
Statement of cash flows adjustment	6	17
Income tax benefit arising from share-based compensation	37	32
Restricted stock units
share-based compensation
Employee benefits expense	99	83
Associated operating cash outflows	(98)	(67)
Statement of cash flows adjustment	1	16
Cash inflows from cash-settled equity forward agreements	9	14
Employee share purchase plan
share-based compensation
Employee benefits expense	37	37
Associated operating cash outflows	(37)	(37)
Share option awards
share-based compensation
Employee benefits expense	5	1
Statement of cash flows adjustment	$ 5	$ 1

X

- Definition

Adjustments for share-based payments to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 20
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20_b&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 51
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_51_a&doctype=Standard
-URIDate 2018-03-16

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- Definition

The cash inflow from cash-settled equity forward agreements.

+ References

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- Definition

The amount of cash outflows associated with expense from share-based payment transactions.

+ References

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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