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CECL (Details 12) - CHF (SFr)
SFr in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Financing Receivable, Recorded Investment [Line Items]      
Origination in current year SFr 0   SFr 0
Origination in current year-1 9   7
Origination in current year-2 0   0
Origination in current year-3 0   0
Origination in current year-4 0   47
Origination 5 years or more 29   0
Total term positions 38   54
Revolving positions 1,417   1,711
Other financial assets held at amortized cost, total 1,455   1,765
Other financial assets, Gross write-offs (4,031) SFr (4)  
Origination In Current Year      
Financing Receivable, Recorded Investment [Line Items]      
Other financial assets, Gross write-offs 0    
Origination In Current Year -1      
Financing Receivable, Recorded Investment [Line Items]      
Other financial assets, Gross write-offs 0    
Origination In Current Year -2      
Financing Receivable, Recorded Investment [Line Items]      
Other financial assets, Gross write-offs 0    
Origination In Current Year -3      
Financing Receivable, Recorded Investment [Line Items]      
Other financial assets, Gross write-offs 0    
Origination In Current Year -4      
Financing Receivable, Recorded Investment [Line Items]      
Other financial assets, Gross write-offs 0    
Origination In Current Year -5 or more      
Financing Receivable, Recorded Investment [Line Items]      
Other financial assets, Gross write-offs 0    
Total term positions      
Financing Receivable, Recorded Investment [Line Items]      
Other financial assets, Gross write-offs 0    
Revolving positions      
Financing Receivable, Recorded Investment [Line Items]      
Other financial assets, Gross write-offs 0    
Financing receivable, before Allowance for Credit Loss and Fee      
Financing Receivable, Recorded Investment [Line Items]      
Other financial assets, Gross write-offs 0    
Investment grade | AAA to BBB      
Financing Receivable, Recorded Investment [Line Items]      
Origination in current year 0   0
Origination in current year-1 0   0
Origination in current year-2 0   0
Origination in current year-3 0   0
Origination in current year-4 0   0
Origination 5 years or more 0   0
Total term positions 0   0
Revolving positions 0   0
Other financial assets held at amortized cost, total 0   0
Non-investment grade | BB to C      
Financing Receivable, Recorded Investment [Line Items]      
Origination in current year 0   0
Origination in current year-1 9   7
Origination in current year-2 0   0
Origination in current year-3 0   0
Origination in current year-4 0   47
Origination 5 years or more 29   0
Total term positions 38   54
Revolving positions 1,417   1,711
Other financial assets held at amortized cost, total 1,455   1,765
Non-investment grade | D      
Financing Receivable, Recorded Investment [Line Items]      
Origination in current year 0   0
Origination in current year-1 0   0
Origination in current year-2 0   0
Origination in current year-3 0   0
Origination in current year-4 0   0
Origination 5 years or more 0   0
Total term positions 0   0
Revolving positions 0   0
Other financial assets held at amortized cost, total SFr 0   SFr 0