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Employee benefits (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Overfunded Pension Plans [Member]
IfrsStatementLineItems [Line Items]
Interest income	$ 103	$ 84
Translation adjustment	73	46
Transfers	(27)
Overfunded Pension Plans [Member] | Plan assets [member]
IfrsStatementLineItems [Line Items]
Benefit obligation (Plan assets) as at beginning of the year	6,340	3,752
Interest income	429	412
Employer contributions	22	45
Benefits paid	(479)	(534)
Return on plan assets (excluding interest income)	286	(752)
Translation adjustment	320	44
Transfers	(1,261)	3,373
Benefit obligation (Plan assets) as at end of the year	5,657	6,340
Underfunded Pension Plans [Member]
IfrsStatementLineItems [Line Items]
Interest income	1
Transfers	27
Underfunded Pension Plans [Member] | Plan assets [member]
IfrsStatementLineItems [Line Items]
Benefit obligation (Plan assets) as at beginning of the year	339	3,779
Interest income	85	17
Employer contributions	25	14
Benefits paid	(126)	(58)
Return on plan assets (excluding interest income)	44	(31)
Translation adjustment	28	(9)
Transfers	1,261	(3,373)
Effect of changes in the actuarial assumptions	(841)
Benefit obligation (Plan assets) as at end of the year	815	339
Other Benefits [Member] | Plan assets [member]
IfrsStatementLineItems [Line Items]
Benefit obligation (Plan assets) as at beginning of the year
Employer contributions	56	57
Benefits paid	(56)	(57)
Benefit obligation (Plan assets) as at end of the year

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
-Subparagraph f
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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 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

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 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
-Paragraph 141
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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
-Paragraph 140
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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
-Subparagraph g
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_g&doctype=Standard
-URIDate 2023-03-23

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2023-03-23

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