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Pension and similar obligations - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Disclosure of defined benefit plans [line items]
Number of defined benefit plans	84
Present value of funded obligations	$ 4,784	$ 4,604
Employee benefit net	1,661	1,523
Increase in fair value of the plan assets	75
Actual return on plans assets resulting to gain (losses)	$ 311	$ (927)
Weighted average duration of the benefit benefit obligation	11 years	11 years 4 months 24 days
Defined Benefit Plan [Member]
Disclosure of defined benefit plans [line items]
Defined contribution plans	$ 166	$ 164	$ 147
Increase in defined benefit obligations	$ 212
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	$ 113
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	$ 1,100
Deferred [member]
Disclosure of defined benefit plans [line items]
Present value of funded obligations	1,000
Members in Retirement [Member]
Disclosure of defined benefit plans [line items]
Present value of funded obligations	3,300
Funded Defined Benefit Plans [member]
Disclosure of defined benefit plans [line items]
Expected contribution towards defined benefit plans	229
Unfunded Defined Benefit Plans And Post Retirement Medical Plans [member]
Disclosure of defined benefit plans [line items]
Expected contribution towards defined benefit plans	$ 76

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- Definition

Increase decrease in defined benefit obligations.

+ References

No definition available.

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+ References

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- Definition

Number of postemployment benefit defined benefit plans.

+ References

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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 2023-01-01
-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
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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 [member]]

+ References

Reference 1: 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 [member]]

+ References

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