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Post-employee benefit plans - Interest cost (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Total interest on post-employment benefit obligations | $ (17) | $ (18) | $ (34) | $ (36)
DB pension |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Total interest on post-employment benefit obligations | (5) | (5) | (11) | (9)
OPEBs |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Total interest on post-employment benefit obligations | $ (12) | $ (13) | $ (23) | $ (27)

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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 increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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