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Restructuring expenses (Details) - CHF (SFr)
SFr in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses SFr 391 SFr 120
General and Administrative Expense [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 231 15
of which pensions    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 15 1
Compensation and benefits    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 160 105
of which severance    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 88 27
of which accelerated deferred compensation    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 65 70
Operating Segments | Wealth Management    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 46 22
Operating Segments | Investment Bank    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 150 32
Operating Segments | Swiss Bank    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 36 3
Operating Segments | Asset Management    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 5 1
Operating Segments | Capital Release Unit    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 137 67
Corporate Center    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses 48 1
Adjustments    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses SFr (31) SFr (6)