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Other assets and other liabilities (Details 2) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Premises and equipment      
Buildings and improvements SFr 863 SFr 839  
Land 213 215  
Leasehold improvements 1,238 1,438  
Software 1,074 8,261  
Equipment 859 990  
Premises and equipment 4,247 11,743  
Accumulated depreciation (2,666) (7,637)  
Total premises and equipment, net 1,581 4,106  
Depreciation and impairment      
Depreciation 805 997 SFr 903
Impairment 1,798 250 20
Amortization and impairment on right-of-use assets 529 256 SFr 313
Right-of-use assets [Abstract]      
Right-of-use assets 1,093 1,693  
Premises, equipment and right-of-use assets SFr 2,674 SFr 5,799