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Other investments (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other investments      
Other investments SFr 4,017 SFr 5,463  
Accumulated depreciation, real estate held for investment 25 24 SFr 28
Impairment charges 0 0 SFr 0
Foreclosed or Repossessed, Real Estate [Member]      
Other investments      
Other investments 6 20  
Equity method investments      
Other investments      
Other investments 1,856 1,618  
Equity securities (without a readily determinable fair value)      
Other investments      
Other investments 1,691 3,212  
of which at net asset value      
Other investments      
Other investments 101 72  
of which at measurement alternative      
Other investments      
Other investments 49 366  
of which at fair value      
Other investments      
Other investments 1,503 2,727  
of which at cost less impairment      
Other investments      
Other investments 38 47  
Real estate held for investment      
Other investments      
Other investments 31 46  
Real estate held for investment | Foreclosed or Repossessed, Real Estate [Member]      
Other investments      
Other investments 6 20  
Life finance instruments      
Other investments      
Other investments SFr 439 SFr 587