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Pension and other post-retirement benefits - Plan assets measured at fair value (Details 3) - International - CHF (SFr)
SFr in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value SFr 2,166 SFr 2,316 SFr 3,802
Plan assets at fair value, measured at net asset value per share 316 371  
Other post-retirement defined benefit plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0 SFr 0
Level 1 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 1,076 1,250  
Level 2 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 774 695  
Level 3 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Group equity securities and options | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 70 106  
Plan assets at fair value, measured at net asset value per share 16 45  
Group equity securities and options | Level 1 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Group equity securities and options | Level 2 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 54 61  
Group equity securities and options | Level 3 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Cash and cash equivalents | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 245 118  
Plan assets at fair value, measured at net asset value per share 0 0  
Cash and cash equivalents | Level 1 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 46 28  
Cash and cash equivalents | Level 2 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 199 90  
Cash and cash equivalents | Level 3 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Debt securities | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 1,787 2,070  
Plan assets at fair value, measured at net asset value per share 300 326  
Debt securities | Level 1 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 1,030 1,222  
Debt securities | Level 2 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 457 522  
Debt securities | Level 3 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Government debt securities | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 1,030 1,266  
Plan assets at fair value, measured at net asset value per share 0 0  
Government debt securities | Level 1 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 1,030 1,222  
Government debt securities | Level 2 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 44  
Government debt securities | Level 3 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Corporate debt securities | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 757 804  
Plan assets at fair value, measured at net asset value per share 300 326  
Corporate debt securities | Level 1 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Corporate debt securities | Level 2 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 457 478  
Corporate debt securities | Level 3 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Alternative investments | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value (10) (59)  
Plan assets at fair value, measured at net asset value per share 0 0  
Alternative investments | Level 1 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Alternative investments | Level 2 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value (10) (59)  
Alternative investments | Level 3 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Other alternative investments | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value (10) (59)  
Plan assets at fair value, measured at net asset value per share 0 0  
Other alternative investments | Level 1 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Other alternative investments | Level 2 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value (10) (59)  
Other alternative investments | Level 3 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Other investments, plan assets | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 74 81  
Plan assets at fair value, measured at net asset value per share 0 0  
Other investments, plan assets | Level 1 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 0 0  
Other investments, plan assets | Level 2 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value 74 81  
Other investments, plan assets | Level 3 | Defined benefit pension plans      
Defined benefit plan, Disclosure      
Plan assets at fair value SFr 0 SFr 0