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Business developments - Business developments (Details 5) - CHF (SFr)
SFr in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items]          
Description of Transaction     Capital increaseOn November 23, 2022, Credit Suisse Group AG held an Extraordinary General Meeting, at which shareholders approved two capital increases. Credit Suisse Group AG completed the first capital increase on November 25, 2022 by way of a share placement of 462,041,884 newly issued shares to qualified investors resulting in gross proceeds of CHF 1.76 billion. Credit Suisse Group AG completed the second capital increase by way of a rights offering on December 9, 2022. By the end of the rights exercise period, 98.2% of the rights had been exercised for the issuance of 872,989,594 shares. The remaining 16,378,864 newly issued shares for which rights were not exercised were sold in the market. The rights offering resulted in gross proceeds of CHF 2.25 billion. The capital increases resulted in 1,351,410,342 newly issued shares and gross proceeds for Credit Suisse Group AG of CHF 4.0 billion. Credit Suisse Group AG made capital contributions of CHF 3.89 billion to its wholly owned subsidiary Credit Suisse AG.    
Number of shares issued     1,351,410,342    
Proceeds from issuance     SFr 3,924 SFr 0 SFr 0
Issuance of common shares     4,014 0  
Stock Issued During Period, Value, New Issues     SFr 4,014 0  
Increase decrease in customer deposits SFr 138,000        
Ratio net asset outflows to Assets Under Management     8.00%    
Percentage of rights exercised     98.20%    
Net revenues     SFr 14,921 22,696 22,389
Total operating expenses     SFr 18,163 SFr 19,091 SFr 17,826
Private Placement [Member] | Transaction I [Member]          
Subsidiary, Sale of Stock [Line Items]          
Transaction Date     Nov. 25, 2022    
Number of shares issued     462,041,884    
Proceeds from issuance     SFr 1,760    
Rights Offering [Member] | Transaction II [Member]          
Subsidiary, Sale of Stock [Line Items]          
Transaction Date     Dec. 09, 2022    
Number of shares issued     872,989,594    
Proceeds from issuance     SFr 2,250    
Sold in the market [Member] | Transaction II [Member]          
Subsidiary, Sale of Stock [Line Items]          
Number of shares issued     16,378,864    
Allfunds Group [Member]          
Subsidiary, Sale of Stock [Line Items]          
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions 0.00% 8.60%      
Credit Suisse AG [Member]          
Subsidiary, Sale of Stock [Line Items]          
Additional paid-in capital increase, capital contribution     SFr 3,890    
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions     100.00%    
Energy Infrastructure Partners AG [Member]          
Subsidiary, Sale of Stock [Line Items]          
Description of Transaction     Energy Infrastructure PartnersOn October 21, 2022, the Group entered into an agreement with the managing partners of Energy Infrastructure Partners AG (EIP) to acquire the Group’s remaining 30% stake in EIP. Following the completion of this transaction, the Group no longer holds any shares in EIP.    
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions 0.00% 30.00%