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Guarantees and commitments - Other guarantees (Details 2) - CHF (SFr)
SFr in Billions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Guarantees        
Amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland     SFr 6.0 SFr 6.0
Deposit Insurance Guarantee Scheme, Amount Guaranteed, Percentage 1.60%      
Group's share in amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland SFr 0.6 SFr 0.5    
Bank        
Guarantees        
Amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland     SFr 6.0 SFr 6.0
Deposit Insurance Guarantee Scheme, Amount Guaranteed, Percentage 1.60%      
Group's share in amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland SFr 0.6 SFr 0.5