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Restructuring expenses (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses SFr 393 SFr 467 SFr 113
General and Administrative Expense [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 232 117 68
of which pensions      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 15 8 4
Compensation and benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 161 350 45
of which severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 88 150 26
of which accelerated deferred compensation      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 66 191 19
Operating Segments | Wealth Management      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 46 96 16
Operating Segments | Swiss Bank      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 36 22 11
Operating Segments | Asset Management      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 6 16 3
Operating Segments | Non-core Legacy      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 288 350 75
Corporate Center      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 48 49 (2)
Adjustments      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses SFr (31) SFr (66) SFr 10