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Post-retirement benefits - Summary of movement in plan assets (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)
Employer contributions	237	211	$ 464
Return on plan assets, net of interest on assets	(222)	2,831	(371)
Impact of buy-in	216	0	0
Currency exchange rate gains/(losses)	10	(35)
Ending balance	(723)	(470)	(1,028)
Plan assets
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	10,708	14,700
Settlements	(4)	0
Interest on obligation	512	334
Contributions by plan participants	19	20
Employer contributions	237	211
Benefits paid	(748)	(783)
Non-investment expenses	(20)	(13)
Return on plan assets, net of interest on assets	222	(2,831)
Impact of buy-in	(216)	0
Assets transferred to defined contribution section	(6)	(4)
Currency exchange rate gains/(losses)	434	(926)
Ending balance	11,138	10,708	$ 14,700
Pension benefits
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	152
Employer contributions	205
Currency exchange rate gains/(losses)	17
Ending balance	(95)	152
Pension benefits | Plan assets
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	10,708
Settlements	(4)
Interest on obligation	512
Contributions by plan participants	19
Employer contributions	205
Benefits paid	(716)
Non-investment expenses	(20)
Return on plan assets, net of interest on assets	222
Impact of buy-in	(216)
Assets transferred to defined contribution section	(6)
Currency exchange rate gains/(losses)	434
Ending balance	11,138	10,708
Other benefits
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	(622)
Employer contributions	32
Currency exchange rate gains/(losses)	(7)
Ending balance	(628)	(622)
Other benefits | Plan assets
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	0
Settlements	0
Interest on obligation	0
Contributions by plan participants	0
Employer contributions	32
Benefits paid	(32)
Non-investment expenses	0
Return on plan assets, net of interest on assets	0
Impact of buy-in	0
Assets transferred to defined contribution section	0
Currency exchange rate gains/(losses)	0
Ending balance	$ 0	$ 0

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
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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-URIDate 2023-03-23

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [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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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 decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]]

+ References

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-Name IAS
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from administration costs in the current period, that are not reflected in return on plan assets. [Refer: Administrative expenses; Net defined benefit liability (asset)] [Contrast: Administration costs not reflected in return on plan assets, defined benefit plans; Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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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
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
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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
-Number 19
-IssueDate 2023-01-01
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [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
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

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Decrease (Increase) In Net Defined Benefit Liability (Asset) Resulting From Impact Of Buy-In

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No definition available.

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Decrease Through Transfer Of Assets, Net Defined Benefit Liability (Asset)

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