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Post-employee benefit plans - Interest Cost (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Total interest on post-employment benefit obligations | $ (11) | $ (15) | $ (23) | $ (31)
DB pension |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Total interest on post-employment benefit obligations | (2) | (5) | (5) | (10)
OPEBs |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Total interest on post-employment benefit obligations | $ (9) | $ (10) | $ (18) | $ (21)

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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 2019-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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