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Employee Future Benefits - Summary of Potential Impact on Obligations Arising From Changes in Key Assumptions (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018
U.S. [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Decrease in mortality rates | 10.00%
Canada [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Decrease in mortality rates | 10.00%
Male [Member] | U.S. [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 10 months 25 days
Male [Member] | Canada [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days
Female [Member] | U.S. [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 10 months 25 days
Female [Member] | Canada [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days
Actuarial assumption of discount rates [Member] | Pension defined benefit plans [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Percentage of reasonably possible increase in actuarial assumption | 0.00%
Percentage of reasonably possible decrease in actuarial assumption | 0.00%
Actuarial assumption of discount rates [Member] | Retiree welfare plans [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Percentage of reasonably possible increase in actuarial assumption | 0.00%
Percentage of reasonably possible decrease in actuarial assumption | 0.00%
Actuarial assumption of medical cost trend rates [Member] | Pension defined benefit plans [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Percentage of reasonably possible increase in actuarial assumption | 0.00%
Percentage of reasonably possible decrease in actuarial assumption | 0.00%
Actuarial assumption of medical cost trend rates [Member] | Retiree welfare plans [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Percentage of reasonably possible increase in actuarial assumption | 0.00%
Percentage of reasonably possible decrease in actuarial assumption | 0.00%

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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [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 reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [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 Actuarial assumptions increase in life expectancy at age sixty five due to ten percent decrease in mortality rate. + References No definition available. + Details
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