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Post-employee benefit plans - Components of Post-Employment Benefit Plans Financing Cost (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items] |  |
Total interest on post-employment benefit obligations | $ (46) | $ (63)
DB pension |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Total interest on post-employment benefit obligations | (10) | (19)
OPEBs |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Total interest on post-employment benefit obligations | $ (36) | $ (44)

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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 2020-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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