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Loans, allowance for loan losses and credit quality (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Loans          
Gross loans SFr 218,455   SFr 269,537    
of which held at amortized cost 215,997   262,179    
of which held at fair value 2,458   7,358    
Net (unearned income)/deferred expenses (34)   (71)    
Allowance for credit losses (1,680) SFr (1,366) (1,362) SFr (1,296) SFr (1,535)
Net loans 216,741   268,104    
Non-performing loans 1,618   1,614    
Non-interest-earning loans 308   338    
Non-accrual loans 1,926   1,952 1,952  
Restructured loans     484    
Potential problem loans 1,349   977    
Total other impaired loans 1,349   1,461    
Gross impaired loans 3,275   3,413    
Consumer mortgages secured by residential real estate for which formal foreclosure proceedings according to local requirements of the applicable jurisdiction were in process 110   130    
Switzerland          
Loans          
Gross loans 151,681   166,982    
Foreign          
Loans          
Gross loans 66,774   102,555    
Corporate and institutional          
Loans          
Gross loans 85,861   118,713    
of which held at amortized cost 82,169   107,421    
Allowance for credit losses (1,215) (1,007) (1,003) (939) (1,217)
Non-accrual loans 963   1,098 913  
Corporate and institutional | Real estate          
Loans          
Gross loans 21,201   25,463    
of which held at amortized cost 21,101   25,157    
Non-accrual loans 355   127 167  
Corporate and institutional | Commercial and industrial loans          
Loans          
Gross loans 48,351   62,740    
of which held at amortized cost 46,519   59,366    
Non-accrual loans 520   801 686  
Corporate and institutional | Financial institutions          
Loans          
Gross loans 14,693   27,955    
of which held at amortized cost 13,519   21,711    
Non-accrual loans 77   159 41  
Corporate and institutional | Governments and public institutions          
Loans          
Gross loans 1,616   2,555    
of which held at amortized cost 1,030   1,187    
Non-accrual loans 11   11 19  
Consumer          
Loans          
Gross loans 132,594   150,824    
of which held at amortized cost 132,577   150,808    
Allowance for credit losses (465) SFr (359) (359) (357) SFr (318)
Non-accrual loans 963   854 1,039  
Consumer | Mortgages          
Loans          
Gross loans 100,606   107,484    
of which held at amortized cost 100,606   107,484    
Non-accrual loans 462   383 572  
Consumer | Loans collateralized by securities          
Loans          
Gross loans 26,380   37,639    
of which held at amortized cost 26,380   37,639    
Non-accrual loans 291   283 262  
Consumer | Consumer finance          
Loans          
Gross loans 5,608   5,701    
of which held at amortized cost 5,591   5,685    
Non-accrual loans SFr 210   SFr 188 SFr 205