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Other intangible assets (Details 1) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other intangible assets      
Gross carrying amount SFr 59 SFr 61  
Accumulated amortization (37) (35)  
Net carrying amount 22 26  
Non-amortizing other intangible assets 436 250  
Other intangible assets (mortgage servicing rights), at fair value 403 224  
Total other intangible assets, net 458 276  
Aggregate amortization expenses and impairment losses      
Aggregate amortization 4 8 SFr 6
Impairment 0 0 2
Estimated amortization expenses      
In the next 12 months 3    
Year two 3    
Year three 2    
Year four 2    
Year five 2    
Tradenames / trademarks      
Other intangible assets      
Gross carrying amount 25 25  
Accumulated amortization (25) (25)  
Net carrying amount 0 0  
Client relationships      
Other intangible assets      
Gross carrying amount 29 31  
Accumulated amortization (9) (7)  
Net carrying amount 20 24  
Other      
Other intangible assets      
Gross carrying amount 5 5  
Accumulated amortization (3) (3)  
Net carrying amount 2 2  
Total other intangible assets, gross 495 311  
Bank      
Other intangible assets      
Gross carrying amount 59 61  
Accumulated amortization (37) (35)  
Net carrying amount 22 26  
Non-amortizing other intangible assets 430 250  
Other intangible assets (mortgage servicing rights), at fair value 403 224  
Total other intangible assets, net 452 276  
Aggregate amortization expenses and impairment losses      
Aggregate amortization 4 8 6
Impairment 0 0 SFr 2
Estimated amortization expenses      
In the next 12 months 3    
Year two 3    
Year three 2    
Year four 2    
Year five 2    
Bank | Tradenames / trademarks      
Other intangible assets      
Gross carrying amount 25 25  
Accumulated amortization (25) (25)  
Net carrying amount 0 0  
Bank | Client relationships      
Other intangible assets      
Gross carrying amount 29 31  
Accumulated amortization (9) (7)  
Net carrying amount 20 24  
Bank | Other      
Other intangible assets      
Gross carrying amount 5 5  
Accumulated amortization (3) (3)  
Net carrying amount 2 2  
Total other intangible assets, gross SFr 489 SFr 311