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Employee benefit obligations - Reconciliation of Employee Benefit Obligation (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of defined benefit plans [abstract]
Employee benefit obligations at January 1	SFr (5.9)	SFr (5.6)
Amounts recognized in income statement	(3.1)	(2.6)
Amounts recognized in other comprehensive income	4.4	0.9
Contributions by the employer	(1.8)	1.5
Employee benefit obligations at December 31	SFr (6.3)	SFr (5.9)

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- References

No definition available.

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2022-03-24
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from expense (income) included in profit or loss. [Refer: Net defined benefit liability (asset); Profit (loss)] [Contrast: Post-employment benefit expense in profit or loss, defined benefit plans]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
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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
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- Definition

Decrease (Increase) in Net Defined Benefit Liability Resulting From Resulting From Contributions (Unpaid Contributions) To Plan By Employer

+ References

No definition available.

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