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Other assets and other liabilities (Details 2) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Premises and equipment      
Buildings and improvements SFr 859 SFr 1,107  
Land 215 241  
Leasehold improvements 1,601 1,722  
Software 8,809 8,146  
Equipment 1,831 1,806  
Premises and equipment 13,315 13,022  
Accumulated depreciation (8,717) (8,129)  
Total premises and equipment, net 4,598 4,893  
Depreciation and impairment      
Depreciation 1,129 1,020 SFr 964
Impairment 265 21 10
Amortization and impairment on right-of-use assets 304 361 331
Right-of-use assets [Abstract]      
Right-of-use assets 2,331 2,412  
Premises, equipment and right-of-use assets 6,929 7,305  
Bank      
Premises and equipment      
Buildings and improvements 839 1,084  
Land 215 241  
Leasehold improvements 1,438 1,578  
Software 8,261 7,660  
Equipment 990 1,004  
Premises and equipment 11,743 11,567  
Accumulated depreciation (7,637) (7,143)  
Total premises and equipment, net 4,106 4,424  
Depreciation and impairment      
Depreciation 997 903 860
Impairment 250 20 10
Amortization and impairment on right-of-use assets 256 313 SFr 284
Right-of-use assets [Abstract]      
Right-of-use assets 1,693 1,716  
Premises, equipment and right-of-use assets SFr 5,799 SFr 6,140