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Restructuring expenses (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses SFr 533 SFr 103 SFr 157
Restructuring Program 2022 [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 357    
Restructuring and related cost, expected cost 2,900    
General and Administrative Expense [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 171 58 50
of which pensions      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 37 (11) 38
Compensation and benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 362 45 107
of which severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 159 25 69
of which accelerated deferred compensation      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 194 20 38
Operating Segments | Wealth Management      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 109 19 41
Operating Segments | Investment Bank      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 327 71 48
Operating Segments | Swiss Bank      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 21 11 42
Operating Segments | Asset Management      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 16 3 18
Corporate Center      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 60 (1) 8
Bank      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 467 113 122
Bank | General and Administrative Expense [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 117 68 20
Bank | of which pensions      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 8 4 8
Bank | Compensation and benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 350 45 102
Bank | of which severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 150 26 66
Bank | of which accelerated deferred compensation      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 191 19 36
Bank | Operating Segments | Wealth Management      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 109 19 41
Bank | Operating Segments | Investment Bank      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 327 71 48
Bank | Operating Segments | Swiss Bank      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 21 11 42
Bank | Operating Segments | Asset Management      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 16 3 18
Bank | Corporate Center      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 60 (1) 8
Bank | Adjustments      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses SFr (66) SFr 10 SFr (35)