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Employee Future Benefits - Summary of Potential Impact on Obligations Arising From Changes in Key Assumptions (Detail) $ in Millions | Dec. 31, 2018 CAD ($)
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Actuarial assumption of discount rates [Member] | Pension defined benefit plans [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of increase in actuarial assumption | $ (423)
Impact of decrease in actuarial assumption | 500
Actuarial assumption of discount rates [Member] | Retiree welfare plans [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of increase in actuarial assumption | (62)
Impact of decrease in actuarial assumption | 74
Actuarial assumption of medical cost trend rates [Member] | Retiree welfare plans [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of increase in actuarial assumption | 21
Impact of decrease in actuarial assumption | (18)
Actuarial assumption of decrease in inflation rates [Member] | Pension defined benefit plans [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of decrease in actuarial assumption | 114
Actuarial assumption of decrease in inflation rates [Member] | Retiree welfare plans [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of decrease in actuarial assumption | $ 14

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard -URIDate 2018-03-16 + Details
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