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Restructuring provision - Rollforward (Details 2) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restructuring provision      
Restructuring Reserve, Beginning Balance SFr 114 SFr 19 SFr 49
Restructuring expenses 393 467 113
Reclassifications     (25)
Utilization 306 128 63
Restructuring Reserve, Ending Balance SFr 15 114 19
Stock compensation plan | Share awards      
Restructuring provision      
Vesting period 3 years    
General and Administrative Expense [Member]      
Restructuring provision      
Restructuring Reserve, Beginning Balance SFr 0 0 2
Restructuring expenses 232 117 68
Reclassifications     (3)
Utilization 119 73 31
Restructuring Reserve, Ending Balance 0 0 0
of which pensions      
Restructuring provision      
Restructuring expenses 15 8 4
Compensation and benefits      
Restructuring provision      
Restructuring Reserve, Beginning Balance 114 19 47
Restructuring expenses 88 150 26
Reclassifications     (22)
Utilization 187 55 32
Restructuring Reserve, Ending Balance 15 114 19
Unsettled share-based compensation obligations classified as a component of total shareholders equity      
Restructuring provision      
Restructuring expenses 11 94 13
Other personnel-related charges      
Restructuring provision      
Restructuring expenses 63 106 7
Excluding unsettled compensation, pension obligations and accelerated accumulated depreciation      
Restructuring provision      
Restructuring expenses 207 223 58
General and Administrative Expense, Excluding accelerated accumulated depreciation and pension obligations [Member]      
Restructuring provision      
Restructuring expenses 119 73 32
Accelerated accumulated depreciation      
Restructuring provision      
Restructuring expenses SFr 97 SFr 36 SFr 31