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Related parties - Additional information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Key management personnel
Disclosure of transactions between related parties [line items]
Key management personnel remuneration paid	$ 38	$ 34	$ 26

X

- 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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- Definition

The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

+ References

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Balance Type:	debit
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- Details

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