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Share-based payments - Share-based payment Amounts Included in the Income Statements as Operating Costs (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Total share-based payments | $ (20) | $ (19) | $ (50) | $ (46)
Employee savings plan (ESP) |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Total share-based payments | (7) | (7) | (14) | (14)
Restricted share units (RSUs) and performance share units (PSUs) |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Total share-based payments | (11) | (10) | (30) | (27)
Other |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Total share-based payments | $ (2) | $ (2) | $ (6) | $ (5)

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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. + Details
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- Definition The amount of expense arising from share-based payment transactions in which the 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 2017-01-01 -Paragraph 51 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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- Details
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