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Other investments (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other investments      
Other investments SFr 5,518 SFr 5,826  
Accumulated depreciation, real estate held for investment 28 32 SFr 35
Impairment charges 0 0 1
Foreclosed or Repossessed, Real Estate [Member]      
Other investments      
Other investments 20 9  
Equity method investments      
Other investments      
Other investments 1,619 1,644  
Equity securities (without a readily determinable fair value)      
Other investments      
Other investments 3,213 3,317  
of which at net asset value      
Other investments      
Other investments 73 54  
of which at measurement alternative      
Other investments      
Other investments 368 347  
of which at fair value      
Other investments      
Other investments 2,726 2,869  
of which at cost less impairment      
Other investments      
Other investments 46 47  
Real estate held for investment      
Other investments      
Other investments 99 76  
Real estate held for investment | Foreclosed or Repossessed, Real Estate [Member]      
Other investments      
Other investments 20 6  
Life finance instruments      
Other investments      
Other investments 587 789  
Bank      
Other investments      
Other investments 5,463 5,788  
Accumulated depreciation, real estate held for investment 24 28 31
Impairment charges 0 0 SFr 1
Bank | Foreclosed or Repossessed, Real Estate [Member]      
Other investments      
Other investments 20 9  
Bank | Equity method investments      
Other investments      
Other investments 1,618 1,636  
Bank | Equity securities (without a readily determinable fair value)      
Other investments      
Other investments 3,212 3,315  
Bank | of which at net asset value      
Other investments      
Other investments 72 53  
Bank | of which at measurement alternative      
Other investments      
Other investments 366 345  
Bank | of which at fair value      
Other investments      
Other investments 2,727 2,869  
Bank | of which at cost less impairment      
Other investments      
Other investments 47 48  
Bank | Real estate held for investment      
Other investments      
Other investments 46 48  
Bank | Real estate held for investment | Foreclosed or Repossessed, Real Estate [Member]      
Other investments      
Other investments 20 6  
Bank | Life finance instruments      
Other investments      
Other investments SFr 587 SFr 789