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Employee Future Benefits - Summary of Major Categories of Plan Assets and Actual Per Cent Allocation to Each Category (Parenthetical) (Detail) - CAD	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
U.S. plans [Member]
Disclosure of fair value of plan assets [Line Items]
Percentage of plan assets	6.00%	6.00%
Equity securities	CAD 1,300,000	CAD 1,100,000
Canadian plans [Member]
Disclosure of fair value of plan assets [Line Items]
Percentage of plan assets	0.30%	3.00%
Equity securities	CAD 0	CAD 0

X

- 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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- Definition

The amount that instruments representing equity (rather than debt) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 142
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_142_b&doctype=Standard
-URIDate 2017-03-09

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- Definition

Percentage of plan assets not quoted in active markets.

+ References

No definition available.

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