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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, 2023	Dec. 31, 2022
Retiree welfare plans [Member] | 2032 [Member] | Top of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	9.00%
Retiree welfare plans [Member] | 2032 [Member] | Bottom of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	4.80%
Retiree welfare plans [Member] | 2035 [Member] | Top of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate		7.80%
Retiree welfare plans [Member] | 2035 [Member] | Bottom of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate		4.80%
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	5.10%	5.30%
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	4.00%	4.80%
Defined benefit cost [Member] | 2032 [Member] | Top of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	7.80%	7.00%
Defined benefit cost [Member] | 2032 [Member] | Bottom of range [Member]
Disclosure of defined benefit plans [Line Items]
Health care cost trend rate	4.80%	4.50%
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	5.30%	5.40%
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 2023-01-01
-Paragraph 144
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-URIDate 2023-03-23

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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