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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, 2020 | Dec. 31, 2019
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Retiree welfare plans [Member] | 2032 [Member] | Top of range [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Health care cost trend rate | 7.30% | 7.50%
Retiree welfare plans [Member] | 2032 [Member] | Bottom of range [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Health care cost trend rate | 4.50% | 4.50%
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 | 5.50% | 5.60%
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%
Defined benefit cost [Member] | 2032 [Member] | Top of range [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Health care cost trend rate | 7.50% |
Defined benefit cost [Member] | 2032 [Member] | Bottom of range [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Health care cost trend rate | 4.50% |
Defined benefit cost [Member] | 2030 [Member] | Top of range [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Health care cost trend rate |  | 7.80%
Defined benefit cost [Member] | 2030 [Member] | Bottom of range [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Health care cost trend rate |  | 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 | 5.60% | 5.70%
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%

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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 -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + 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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- Details
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