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Employee Future Benefits - Summary of Disaggregation of Defined Benefit Obligation (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | $ 4,675 | $ 4,706
Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 640 | 665
U.S. plans [Member] | Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 3,052 | 3,026
U.S. plans [Member] | Pension defined benefit plans [member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 621 | 592
U.S. plans [Member] | Pension defined benefit plans [member] | Inactive and retired members [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 2,431 | 2,434
U.S. plans [Member] | Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 489 | 515
U.S. plans [Member] | Retiree welfare plans [Member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 32 | 34
U.S. plans [Member] | Retiree welfare plans [Member] | Inactive and retired members [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 457 | 481
Canadian plans [Member] | Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 1,623 | 1,680
Canadian plans [Member] | Pension defined benefit plans [member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 332 | 393
Canadian plans [Member] | Pension defined benefit plans [member] | Inactive and retired members [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 1,291 | 1,287
Canadian plans [Member] | Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 151 | 150
Canadian plans [Member] | Retiree welfare plans [Member] | Active [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | 22 | 20
Canadian plans [Member] | Retiree welfare plans [Member] | Inactive and retired members [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Disaggregation of defined benefit obligation | $ 129 | $ 130

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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 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_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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- Details
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- Details
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- Details
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- Details
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- Details
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