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Post-employee benefit plans - Funded status (Details) $ in Millions | Jan. 15, 2016 plan | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
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Employee Benefits [Abstract] |  |  |
Number of defined benefit plans retained during sale of subsidiaries | plan | 2 |  |
Plan deficit |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Present value of post- employment benefit obligations |  | $ (26,057) | $ (22,537)
Fair value of plan assets |  | 24,244 | 20,843
Plan surplus (deficit) |  | (1,813) | (1,694)
Plan deficit | FUNDED |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Present value of post- employment benefit obligations |  | (23,746) | (20,249)
Fair value of plan assets |  | 23,894 | 20,520
Plan surplus (deficit) |  | 148 | 271
Plan deficit | PARTIALLY FUNDED |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Present value of post- employment benefit obligations |  | (1,976) | (1,995)
Fair value of plan assets |  | 350 | 323
Plan surplus (deficit) |  | (1,626) | (1,672)
Plan deficit | UNFUNDED |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Present value of post- employment benefit obligations |  | (335) | (293)
Fair value of plan assets |  | 0 | 0
Plan surplus (deficit) |  | $ (335) | $ (293)

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- Definition Employee Benefits [Abstract] + References No definition available. + Details
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- Definition Number Of Defined Benefit Plans Retained During Sale Of Subsidiaries + References No definition available. + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&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 fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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