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Other intangible assets (Details 1) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other intangible assets      
Gross carrying amount SFr 52 SFr 59  
Accumulated amortization (28) (37)  
Net carrying amount 24 22  
Non-amortizing other intangible assets 298 430  
Other intangible assets (mortgage servicing rights), at fair value 305 403  
Total other intangible assets, net 322 452  
Aggregate amortization expenses and impairment losses      
Aggregate amortization 3 4 SFr 8
Impairment 28 0 SFr 0
Estimated amortization expenses      
In the next 12 months 1    
Year two 1    
Year three 1    
Year four 1    
Year five 2    
Tradenames / trademarks      
Other intangible assets      
Gross carrying amount 27 25  
Accumulated amortization (23) (25)  
Net carrying amount 4 0  
Client relationships      
Other intangible assets      
Gross carrying amount 19 29  
Accumulated amortization (2) (9)  
Net carrying amount 17 20  
Other      
Other intangible assets      
Gross carrying amount 6 5  
Accumulated amortization (3) (3)  
Net carrying amount 3 2  
Total other intangible assets, gross SFr 350 SFr 489