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Segment analysis - Segment Results (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) customer	Jun. 30, 2022 USD ($) customer	Jun. 30, 2023 USD ($) customer	Jun. 30, 2022 USD ($) customer
Segment analysis
Revenue	$ 1,255	$ 1,303	$ 2,386	$ 2,440
Adjusted EBITDA	$ 151	$ 181	$ 281	$ 326
Number of customers accounting for greater than 10% of revenue | customer	1	1	1	1
Europe
Segment analysis
Revenue	$ 555	$ 533	$ 1,041	$ 1,032
Adjusted EBITDA	64	61	113	117
Americas
Segment analysis
Revenue	700	770	1,345	1,408
Adjusted EBITDA	$ 87	$ 120	$ 168	$ 209

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The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2022-03-24
-Paragraph 114
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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