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Post-employee benefit plans - Components of Post-Employment Benefit Plans Service Cost (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [line items] |  |
DC pension | $ (106) | $ (102)
Plan amendment gain on OPEBs and DB pension | 0 | 16
Less: Capitalized benefit plans cost | 56 | 58
Total post-employment benefit plans service cost included in operating costs | (266) | (242)
Other costs recognized in severance, acquisition and other costs | (4) | (10)
Total post-employment benefit plans service cost | (270) | (252)
DB pension |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | (213) | (208)
OPEBs |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | $ (3) | $ (6)

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- Definition Gain (Loss) On Plan Amendment Of Net Defined Benefit Liability (Asset) + References No definition available. + Details
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- Definition Post-Employment Benefit Expense, Benefit Plans, Service Cost Capitalized + References No definition available. + Details
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- Definition Post-Employment Benefit Expense, Benefit Plans, Service Cost, Net + References No definition available. + Details
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- Definition Post-Employment Benefit Expense, Benefit Plans, Service Cost, Net, Non-Operating + References No definition available. + Details
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- Definition Post-Employment Benefit Expense, Benefit Plans, Service Cost, Net, Operating + References No definition available. + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_a&doctype=Standard -URIDate 2018-03-16 + Details
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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 post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_53&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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- Details
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