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CECL (Details 4) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other financial assets, Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Cash and due from banks, held at amortized cost, Allowance for Credit Loss, Beginning Balance SFr (0)    
Interest-bearing deposits with banks, held at amortized cost, Allowance for Credit Loss, Beginning Balance (0)    
Securities purchased under resale agreements and securities borrowing transactions, held at amortized cost, Allowance for Credit Loss, Beginning Balance (0)    
Brokerage receivables, held at amortized cost, Allowance for Credit Loss, Beginning Balance 4,186    
Other assets, held at amortized cost, Allowance for Credit Loss, Beginning Balance 30    
Other financial assets, held at amortized cost, Allowance for Credit Loss, Beginning Balance 4,216 SFr 55 SFr 45
Other financial assets, Current-period provision for expected credit losses (132) 4,291 24
Other financial assets, Gross write-offs (8) (9) (12)
Other financial assets, Recovery 0 0 2
Other financial assets, Net write-offs (8) (9) (10)
Other financial assets, Foreign currency translation impact and other adjustments, net 45 (121) (4)
Cash and due from banks, held at amortized cost, Allowance for Credit Loss, Ending Balance (0) (0)  
Interest-bearing deposits with banks, held at amortized cost, Allowance for Credit Loss, Ending Balance (0) (0)  
Securities purchased under resale agreements and securities borrowing transactions, held at amortized cost, Allowance for Credit Loss, Ending Balance (0) (0)  
Brokerage receivables, held at amortized cost, Allowance for Credit Loss, Ending Balance 4,081 4,186  
Other assets, held at amortized cost, Allowance for Credit Loss, Ending Balance 40 30  
Other financial assets, held at amortized cost, Allowance for Credit Loss, Ending Balance 4,121 4,216 55
Other financial assets, individually evaluated 4,099 4,202 17
Other financial assets, collectively evaluated 22 14 38
Archegos Capital Management [Member]      
Other financial assets, Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Other financial assets, Current-period provision for expected credit losses (155) 4,307  
Bank      
Other financial assets, Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Cash and due from banks, held at amortized cost, Allowance for Credit Loss, Beginning Balance (0)    
Interest-bearing deposits with banks, held at amortized cost, Allowance for Credit Loss, Beginning Balance (0)    
Securities purchased under resale agreements and securities borrowing transactions, held at amortized cost, Allowance for Credit Loss, Beginning Balance (0)    
Brokerage receivables, held at amortized cost, Allowance for Credit Loss, Beginning Balance 4,186    
Other assets, held at amortized cost, Allowance for Credit Loss, Beginning Balance 28    
Other financial assets, held at amortized cost, Allowance for Credit Loss, Beginning Balance 4,214 48 43
Other financial assets, Current-period provision for expected credit losses (135) 4,295 19
Other financial assets, Gross write-offs (7) (8) (12)
Other financial assets, Recovery 0 0 2
Other financial assets, Net write-offs (7) (8) (10)
Other financial assets, Foreign currency translation impact and other adjustments, net 46 (121) (4)
Cash and due from banks, held at amortized cost, Allowance for Credit Loss, Ending Balance (0) (0)  
Interest-bearing deposits with banks, held at amortized cost, Allowance for Credit Loss, Ending Balance (0) (0)  
Securities purchased under resale agreements and securities borrowing transactions, held at amortized cost, Allowance for Credit Loss, Ending Balance (0) (0)  
Brokerage receivables, held at amortized cost, Allowance for Credit Loss, Ending Balance 4,081 4,186  
Other assets, held at amortized cost, Allowance for Credit Loss, Ending Balance 37 28  
Other financial assets, held at amortized cost, Allowance for Credit Loss, Ending Balance 4,118 4,214 48
Other financial assets, individually evaluated 4,096 4,200 15
Other financial assets, collectively evaluated 22 14 SFr 33
Bank | Archegos Capital Management [Member]      
Other financial assets, Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Other financial assets, Current-period provision for expected credit losses SFr (155) SFr 4,307