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CECL (Details 16) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Other financial assets, held at amortized cost, Allowance for Credit Loss [Line Items]    
Purchases SFr 931 SFr 196
Bank    
Other financial assets, held at amortized cost, Allowance for Credit Loss [Line Items]    
Purchases SFr 931 SFr 196