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Pension and similar obligations - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Disclosure of defined benefit plans [line items]
Number of defined benefit plans	84
Present value of funded obligations	$ 4,090	$ 4,784
Employee benefit net	1,254	1,661
Increase in fair value of the plan assets	335
Actual return on plans assets resulting to gain (losses)	$ 173	$ 311
Weighted average duration of the benefit obligation	10 years 6 months	11 years
Defined Benefit Plan [Member]
Disclosure of defined benefit plans [line items]
Defined contribution plans	$ 183	$ 166	$ 164
Increase in defined benefit obligations	$ 771
Retirement or Leaving Service Plans [Member]
Disclosure of defined benefit plans [line items]
Number of defined benefit plans	65
Medical Cost Plans [Member]
Disclosure of defined benefit plans [line items]
Number of defined benefit plans	15
Medical Cost Plans [Member] | Brazil [Member]
Disclosure of defined benefit plans [line items]
Present value of funded obligations	$ 73
Other Long Term Employee Benefit Plans [Member]
Disclosure of defined benefit plans [line items]
Number of defined benefit plans	4
Active Employees [Member]
Disclosure of defined benefit plans [line items]
Present value of funded obligations	$ 1,000
Deferred [member]
Disclosure of defined benefit plans [line items]
Present value of funded obligations	900
Members in Retirement [Member]
Disclosure of defined benefit plans [line items]
Present value of funded obligations	2,700
Funded Defined Benefit Plans [member]
Disclosure of defined benefit plans [line items]
Expected contribution towards defined benefit plans	225
Unfunded Defined Benefit Plans And Post Retirement Medical Plans [member]
Disclosure of defined benefit plans [line items]
Expected contribution towards defined benefit plans	$ 60

X

- Definition

Increase decrease in defined benefit obligations.

+ References

No definition available.

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Increase decrease in fair value of plan assets.

+ References

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- Definition

Number of postemployment benefit defined benefit plans.

+ References

No definition available.

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph c
-Clause ii
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- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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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.

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- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

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