Other intangible assets (Details 1) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other intangible assets      
Gross carrying amount SFr 61 SFr 51  
Accumulated amortization (35) (20)  
Net carrying amount 26 31  
Non-amortizing other intangible assets 250 206  
Other intangible assets (mortgage servicing rights), at fair value 224 180  
Total other intangible assets, net 276 237  
Aggregate amortization expenses and impairment losses      
Aggregate amortization 8 6 SFr 5
Impairment 0 2 5
Estimated amortization expenses      
In the next 12 months 4    
Year two 3    
Year three 3    
Year four 2    
Year five 2    
Tradenames / trademarks      
Other intangible assets      
Gross carrying amount 25 24  
Accumulated amortization (25) (24)  
Net carrying amount 0 0  
Client relationships      
Other intangible assets      
Gross carrying amount 31 30  
Accumulated amortization (7) 0  
Net carrying amount 24 30  
Other      
Other intangible assets      
Gross carrying amount 5 (3)  
Accumulated amortization (3) 4  
Net carrying amount 2 1  
Total other intangible assets, gross 311 257  
Bank      
Other intangible assets      
Gross carrying amount 61 51  
Accumulated amortization (35) (21)  
Net carrying amount 26 30  
Non-amortizing other intangible assets 250 207  
Other intangible assets (mortgage servicing rights), at fair value 224 180  
Total other intangible assets, net 276 237  
Aggregate amortization expenses and impairment losses      
Aggregate amortization 8 6 5
Impairment 0 2 SFr 5
Estimated amortization expenses      
In the next 12 months 4    
Year two 3    
Year three 3    
Year four 2    
Year five 2    
Bank | Tradenames / trademarks      
Other intangible assets      
Gross carrying amount 25 24  
Accumulated amortization (25) (24)  
Net carrying amount 0 0  
Bank | Client relationships      
Other intangible assets      
Gross carrying amount 31 30  
Accumulated amortization (7) 0  
Net carrying amount 24 30  
Bank | Other      
Other intangible assets      
Gross carrying amount 5 (3)  
Accumulated amortization (3) 3  
Net carrying amount 2 0  
Total other intangible assets, gross SFr 311 SFr 258