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Severance, acquisition and other costs (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Analysis of income and expense [abstract] |  |
Severance | $ (92) | $ (79)
Acquisition and other | (44) | (111)
Total severance, acquisition and other costs | $ (136) | $ (190)
Reduction in management workforce | 4.00% |

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- Definition Restructuring And Related Cost, Number Of Positions Eliminated, Period Percent + References No definition available. + Details
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- Definition Termination Benefits Expense, Acquisition-Related Costs, And Other Costs + References No definition available. + Details
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- Definition The amount of acquisition-related costs recognised as an expense for transactions that are recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph m -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_m&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 171 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_171&doctype=Standard -URIDate 2018-03-16 + Details
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