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Related parties - Executive Board/Board of directors loans (Details)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
CHF (SFr)
member
year
Dec. 31, 2022
CHF (SFr)
member
Dec. 31, 2021
CHF (SFr)
Members of the Executive Board      
Activity in loans to related parties      
Balance at beginning of period SFr 6 SFr 18 SFr 13
Additions 1 1 10
Reductions (1) (13) (5)
Balance at end of period SFr 6 SFr 6 18
Loans to members of the Executive Board, number of members | member 3 4  
Loans to members of the Executive Board, term (in years) | year 10    
Members of the Board of Directors      
Activity in loans to related parties      
Balance at beginning of period SFr 4 SFr 7 9
Additions 0 0 2
Reductions (1) (3) (4)
Balance at end of period SFr 3 SFr 4 7
Loans to members of the Board of Directors, number of members | member 1 2  
Related Party [Member]      
Activity in loans to related parties      
Balance at beginning of period SFr 3,949    
Balance at end of period 1,251 SFr 3,949  
Loan exposure to related parties not made in ordinary course of business SFr 0 SFr 0 SFr 0