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Post-retirement benefits - Additional information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of defined benefit plans [Line Items]
Securities included in fair value of plan assets	$ 1	$ 2
Excess of service cost over cash paid to defined contribution plans	7
Estimated contributions to defined benefit pension plans for next annual reporting period	120
Asset ceiling gain	(12)	$ 60	$ 1
Gain for the change in currency exchange rate of asset ceiling gain	$ 4
Defined benefit obligation weighted average expected future life time	27 years	27 years
Defined benefit obligation weighted average expected future life time at man aged 60 in 2041	28 years	28 years
Healthcare plans
Disclosure of defined benefit plans [Line Items]
Discount rate	5.30%	5.00%
Medical trend rate (%)	9.70%	8.30%
Reduction in medical trend rate (%)	4.70%	4.70%

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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 [domain]]

+ References

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

The fair value of the entity's own transferable financial instruments that are included in the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Classes of financial instruments [domain]; Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
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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.

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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
-Number 19
-IssueDate 2024-01-01
-Paragraph 147
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income (expense); Net defined benefit liability (asset); Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2024-01-01
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- Definition

The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]]

+ References

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Defined benefit obligation weighted average expected future life After Balance Sheet Date

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Defined benefit obligation weighted average expected future life time at balance sheet date.

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Excess of service cost over cash paid to defined contribution plans

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Increase (Decrease) In Net Defined Benefit Liability (Asset) Resulting From Changes In Foreign Exchange Rates To Asset Ceiling

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