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Restructuring provision - Rollforward (Details 2) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restructuring provision      
Restructuring Reserve, Beginning Balance SFr 19 SFr 52  
Restructuring expenses 533 103 SFr 157
Reclassifications   (25)  
Utilization 152 70 23
Restructuring Reserve, Ending Balance SFr 122 19 52
Stock compensation plan | Share awards      
Restructuring provision      
Vesting period 3 years    
General and Administrative Expense [Member]      
Restructuring provision      
Restructuring Reserve, Beginning Balance SFr 0 2  
Restructuring expenses 171 58 50
Reclassifications   (3)  
Utilization 96 36 4
Restructuring Reserve, Ending Balance 0 0 2
of which pensions      
Restructuring provision      
Restructuring expenses 37 (11) 38
Compensation and benefits      
Restructuring provision      
Restructuring Reserve, Beginning Balance 19 50  
Restructuring expenses 159 25 69
Reclassifications   (22)  
Utilization 56 34 19
Restructuring Reserve, Ending Balance 122 19 50
Unsettled share-based compensation obligations classified as a component of total shareholders equity      
Restructuring provision      
Restructuring expenses 95 13 27
Other personnel-related charges      
Restructuring provision      
Restructuring expenses 108 7 11
Excluding unsettled compensation, pension obligations and accelerated accumulated depreciation      
Restructuring provision      
Restructuring expenses 255 62 75
General and Administrative Expense, Excluding accelerated accumulated depreciation and pension obligations [Member]      
Restructuring provision      
Restructuring expenses 96 37 6
Accelerated accumulated depreciation      
Restructuring provision      
Restructuring expenses 38 32 6
Bank      
Restructuring provision      
Restructuring Reserve, Beginning Balance 19 49  
Restructuring expenses 467 113 122
Reclassifications   (25)  
Utilization 128 63 23
Restructuring Reserve, Ending Balance 114 19 49
Bank | General and Administrative Expense [Member]      
Restructuring provision      
Restructuring Reserve, Beginning Balance 0 2  
Restructuring expenses 117 68 20
Reclassifications   (3)  
Utilization 73 31 4
Restructuring Reserve, Ending Balance 0 0 2
Bank | of which pensions      
Restructuring provision      
Restructuring expenses 8 4 8
Bank | Compensation and benefits      
Restructuring provision      
Restructuring Reserve, Beginning Balance 19 47  
Restructuring expenses 150 26 66
Reclassifications   (22)  
Utilization 55 32 19
Restructuring Reserve, Ending Balance 114 19 47
Bank | Unsettled share-based compensation obligations classified as a component of total shareholders equity      
Restructuring provision      
Restructuring expenses 94 13 25
Bank | Other personnel-related charges      
Restructuring provision      
Restructuring expenses 106 7 11
Bank | Excluding unsettled compensation, pension obligations and accelerated accumulated depreciation      
Restructuring provision      
Restructuring expenses 223 58 72
Bank | General and Administrative Expense, Excluding accelerated accumulated depreciation and pension obligations [Member]      
Restructuring provision      
Restructuring expenses 73 32 6
Bank | Accelerated accumulated depreciation      
Restructuring provision      
Restructuring expenses SFr 36 SFr 31 SFr 6