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CECL (Details 12) - CHF (SFr)
SFr in Millions
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items]    
Origination in current year SFr 0 SFr 5
Origination in current year-1 7 0
Origination in current year-2 0 0
Origination in current year-3 0 63
Origination in current year-4 47 2
Origination 5 years or more 0 2
Total term positions 54 72
Revolving positions 1,711 970
Other financial assets held at amortized cost, total 1,765 1,042
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 5
Origination in current year-1 7 0
Origination in current year-2 0 0
Origination in current year-3 0 63
Origination in current year-4 47 2
Origination 5 years or more 0 2
Total term positions 54 72
Revolving positions 1,711 970
Other financial assets held at amortized cost, total 1,765 1,042
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 0 0
Bank    
Financing Receivable, Recorded Investment [Line Items]    
Origination in current year 0 5
Origination in current year-1 7 0
Origination in current year-2 0 0
Origination in current year-3 0 63
Origination in current year-4 47 2
Origination 5 years or more 0 2
Total term positions 54 72
Revolving positions 1,711 970
Other financial assets held at amortized cost, total 1,765 1,042
Bank | 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
Bank | Non-investment grade | BB to C    
Financing Receivable, Recorded Investment [Line Items]    
Origination in current year 0 5
Origination in current year-1 7 0
Origination in current year-2 0 0
Origination in current year-3 0 63
Origination in current year-4 47 2
Origination 5 years or more 0 2
Total term positions 54 72
Revolving positions 1,711 970
Other financial assets held at amortized cost, total 1,765 1,042
Bank | 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