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Business developments - Business developments (Details 5) - CHF (SFr)
SFr in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Subsidiary, Sale of Stock [Line Items]          
Net revenues SFr 3,645 SFr 4,412 SFr 5,103 SFr 8,057 SFr 12,677
Total operating expenses SFr 4,754 SFr 4,950 SFr 4,315 SFr 9,704 SFr 8,252