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Post-employee benefit plans - Contributions (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of defined benefit plans [line items] |  |
Contributions, defined contribution plan | $ (108) | $ (99)
Estimated of contributions expected to be paid to plan for next annual reporting period, defined contribution plan | 110 |
DB pension |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period, defined benefit plan | 210 |
OPEBs |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period, defined benefit plan | 80 |
Plan assets |  |
Disclosure of defined benefit plans [line items] |  |
Contributions, defined benefit plan | (382) | (702)
Plan assets | DB pension |  |
Disclosure of defined benefit plans [line items] |  |
Contributions, defined benefit plan | (305) | (626)
Voluntary contributions | 100 | 400
Plan assets | OPEBs |  |
Disclosure of defined benefit plans [line items] |  |
Contributions, defined benefit plan | $ (77) | $ (76)

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- Definition Contributions To Plan By Employer, Net Defined Contribution Plan + References No definition available. + Details
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- Definition Defined Contribution Plans, Estimate Of Contributions Expected To Be Paid To Plan For Next Annual Reporting Period + References No definition available. + Details
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- Definition Discretionary Contributions To Plan By Employer, Net Defined Benefit Liability (Asset) + References No definition available. + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + 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 estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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- Details
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