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Tax - Net deferred tax assets/liabilities by type (Details 3) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Net deferred tax assets    
Deferred tax assets SFr 305 SFr 3,707
Net operating loss carry-forwards 9,435 7,120
Net operating loss carry-forwards, after allocation of valuation allowances 141 881
Temporary differences 164 2,826
Deferred tax liabilities 1,378 754
Deferred Tax Assets (Liabilities), Net (1,073) 2,953
Net deferred tax assets change (4,026)  
Accumulated undistributed earnings from foreign subsidiaries 18,200  
Deferred Tax Liabilities, Related to Accumulated Undistributed Earnings 0  
Minimum    
Net deferred tax assets    
Decrease in Unrecognized Tax Benefits is Reasonably Possible 0  
Maximum    
Net deferred tax assets    
Decrease in Unrecognized Tax Benefits is Reasonably Possible 14  
Bank    
Net deferred tax assets    
Deferred tax assets 259 3,666
Net operating loss carry-forwards 7,720 6,382
Net operating loss carry-forwards, after allocation of valuation allowances 138 877
Temporary differences 121 2,789
Deferred tax liabilities 670 122
Deferred Tax Assets (Liabilities), Net (411) SFr 3,544
Net deferred tax assets change (3,955)  
Accumulated undistributed earnings from foreign subsidiaries 17,800  
Deferred Tax Liabilities, Related to Accumulated Undistributed Earnings 0  
Bank | Minimum    
Net deferred tax assets    
Decrease in Unrecognized Tax Benefits is Reasonably Possible 0  
Bank | Maximum    
Net deferred tax assets    
Decrease in Unrecognized Tax Benefits is Reasonably Possible SFr 14