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Employee Future Benefits - Summary of Life Expectancies Underlying Values of Obligations in Defined Benefit Pension and Retiree Welfare Plans (Detail) | Dec. 31, 2018 yr
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U.S. [member] | Life expectancy (in years) for those currently age 65 [Member] | Male [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 22.5
U.S. [member] | Life expectancy (in years) for those currently age 65 [Member] | Female [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 24.0
U.S. [member] | Life expectancy (in years) at age 65 for those currently age 45 [Member] | Male [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 24.1
U.S. [member] | Life expectancy (in years) at age 65 for those currently age 45 [Member] | Female [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 25.6
Canada [member] | Life expectancy (in years) for those currently age 65 [Member] | Male [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 23.6
Canada [member] | Life expectancy (in years) for those currently age 65 [Member] | Female [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 25.5
Canada [member] | Life expectancy (in years) at age 65 for those currently age 45 [Member] | Male [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 24.6
Canada [member] | Life expectancy (in years) at age 65 for those currently age 45 [Member] | Female [Member] |
Disclosure of defined benefit plans [Line Items] |
Life expectancy (in years) | 26.4

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- Definition The life expectancy after retirement used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&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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