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Other investments (Details) - CHF (SFr)
SFr in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Other investments      
Other investments SFr 4,667   SFr 5,463
Accumulated depreciation, real estate held for investment 25   24
Impairment charges 0 SFr 0  
Foreclosed or Repossessed, Real Estate [Member]      
Other investments      
Other investments 21   20
Equity method investments      
Other investments      
Other investments 2,151   1,618
Equity securities (without a readily determinable fair value)      
Other investments      
Other investments 1,959   3,212
of which at net asset value      
Other investments      
Other investments 112   72
of which at measurement alternative      
Other investments      
Other investments 375   366
of which at fair value      
Other investments      
Other investments 1,430   2,727
of which at cost less impairment      
Other investments      
Other investments 42   47
Real estate held for investment      
Other investments      
Other investments 47   46
Real estate held for investment | Foreclosed or Repossessed, Real Estate [Member]      
Other investments      
Other investments 21   20
Life finance instruments      
Other investments      
Other investments SFr 510   SFr 587