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Business developments - Business developments (Details 5) - CHF (SFr)
SFr in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Subsidiary, Sale of Stock [Line Items]    
Net revenues SFr 17,102 SFr 8,130
Total operating expenses SFr 13,946 SFr 9,931