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Post-retirement benefits - Summary of funding policy and contributions to plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [Line Items]
Contributions to defined benefit plans	$ 107	$ 237	$ 211
Contributions to defined contribution plans	451	410	363
Total	558	$ 647	$ 574
Pension benefits
Disclosure of net defined benefit liability (asset) [Line Items]
Contributions to defined benefit plans	71
Contributions to defined contribution plans	448
Total	519
Other benefits
Disclosure of net defined benefit liability (asset) [Line Items]
Contributions to defined benefit plans	36
Contributions to defined contribution plans	3
Total	$ 39

X

- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph f
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-URIDate 2024-03-27

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X

- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

+ References

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

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- Definition

Contributions to Defined Contribution Plans

+ References

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