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Pension and other post-retirement benefits - Obligation and funded status (Details) - CHF (SFr)
SFr in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Total amount recognized      
Noncurrent assets SFr 538   SFr 560
International      
Total benefit costs      
Service costs on benefit obligation 6 SFr 8  
Interest costs on benefit obligation 48 30  
Expected return on plan assets (66) (33)  
Amortization of recognized prior service cost/(credit) 1 1  
Amortization of recognized actuarial losses/(gains) (6) 5  
Net periodic benefit/(costs) (17) 11  
PBO      
Service costs 6 8  
Interest costs 48 SFr 30  
International | Defined benefit pension plans      
Pension and Other Postretirement Benefit Contributions      
Contributions expected to be made by the company by the end of the current fiscal year 17    
Contributions made to defined benefit pension plans and other post-retirement defined benefit plans 9    
International | Other post-retirement defined benefit plans      
Pension and Other Postretirement Benefit Contributions      
Contributions expected to be made by the company by the end of the current fiscal year 12    
Contributions made to defined benefit pension plans and other post-retirement defined benefit plans SFr 6