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Employee Future Benefits - Summary of Cash Payments (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Pension defined benefit plans [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | $ 157 | $ 162
Pension defined benefit plans [member] | Defined benefit plans [Member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 79 | 85
Pension defined benefit plans [member] | Defined contribution plans [Member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 78 | 77
Retiree welfare plans [Member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | 10 | 12
Retiree welfare plans [Member] | Defined benefit plans [Member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Cash payment for future benefit plans | $ 10 | $ 12

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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [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 2018-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_f&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | debit
Period Type: | duration

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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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