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Employee benefit obligations - Defined benefit obligations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of defined benefit plans [line items]
Defined benefit obligations	$ 305,000,000	$ 324,000,000
Germany
Disclosure of defined benefit plans [line items]
Defined benefit obligations	98,000,000	103,000,000
Obligations
Disclosure of defined benefit plans [line items]
Current service cost	6,000,000	7,000,000
Exceptional past service charges		3,000,000
Unfunded
Disclosure of defined benefit plans [line items]
Defined benefit obligations	100,000,000	105,000,000
Other employee benefit obligations
Disclosure of defined benefit plans [line items]
Interest income/ cost	2,000,000	2,000,000
Current service cost	5,000,000	3,000,000
Exceptional past service charges	$ 0	$ 1,000,000

X

- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from exceptional past service charge. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan).

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

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

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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

No definition available.

+ Details

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X

- 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 2024-01-01
-Paragraph 141
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_b&doctype=Standard
-URIDate 2024-03-27

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X

- Definition

The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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-URIDate 2024-03-27

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