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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, 2017 yr
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)	22.4
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)	23.9
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)	24.0
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)	25.5
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)	22.8
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)	24.7
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)	23.8
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)	25.6

X

- 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 2017-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard
-URIDate 2017-03-09

+ 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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