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Post-retirement benefits - Summary of movement in net defined benefit liability (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	$ (470)	$ (1,028)
Amounts recognised in income statement	(33)	(192)
Amounts recognised in other comprehensive income	(461)	578
Employer contributions	237	211	$ 464
Assets transferred to defined contribution section	(6)	(4)
Currency exchange rate gains/(losses)	10	(35)
Ending balance	(723)	(470)	$ (1,028)
Pension benefits
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	152
Amounts recognised in income statement	5
Amounts recognised in other comprehensive income	(468)
Employer contributions	205
Assets transferred to defined contribution section	(6)
Currency exchange rate gains/(losses)	17
Ending balance	(95)	152
Other benefits
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	(622)
Amounts recognised in income statement	(38)
Amounts recognised in other comprehensive income	7
Employer contributions	32
Assets transferred to defined contribution section	0
Currency exchange rate gains/(losses)	(7)
Ending balance	$ (628)	$ (622)

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 [member]]

+ References

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

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from expense (income) included in profit or loss. [Refer: Net defined benefit liability (asset); Profit (loss)] [Contrast: Post-employment benefit expense in profit or loss, defined benefit plans]

+ References

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

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ 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

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- Definition

Assets Transferred to Defined Contribution

+ References

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