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Employee Future Benefits - Summary of Key Assumptions Used by to Determine Defined Benefit Obligation and Net Benefit Cost for Defined Benefit Pension Plans and Retiree Welfare Plans (Parenthetical) (Detail)	Dec. 31, 2017	Dec. 31, 2016
Defined benefit cost [Member] | 2032 [Member] | Top of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	8.80%	9.00%
Defined benefit cost [Member] | 2032 [Member] | Bottom of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	5.00%	5.00%
Defined benefit cost [Member] | Canadian plans [Member] | 2026 [Member] | Top of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	6.00%	6.10%
Defined benefit cost [Member] | Canadian plans [Member] | 2026 [Member] | Bottom of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	4.80%	4.80%
Retiree welfare plans [Member] | 2032 [Member] | Top of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	8.50%	8.80%
Retiree welfare plans [Member] | 2032 [Member] | Bottom of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	5.00%	5.00%
Retiree welfare plans [Member] | Canadian plans [Member] | 2026 [Member] | Top of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	5.90%	6.00%
Retiree welfare plans [Member] | Canadian plans [Member] | 2026 [Member] | Bottom of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	4.80%	4.80%

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- Definition

Medical cost trend rate used as 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
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-IssueDate 2017-01-01
-Paragraph 144
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+ 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.

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