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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 ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
U.S. plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Percentage of plan assets | 7.00% | 7.00%
Equity securities | $ 1.1 | $ 1.3
Canadian plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Percentage of plan assets | 0.10% | 0.10%
Equity securities | $ 0.0 | $ 0.0

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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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- Definition The amount instruments representing equity (rather than debt) contribute to 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 2020-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Percentage of plan assets not quoted in active markets. + References No definition available. + Details
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- Details
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- Details
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