Related parties - Executive Board/Board of directors loans (Details)
SFr in Millions
12 Months Ended
Dec. 31, 2021
CHF (SFr)
year
member
Dec. 31, 2020
CHF (SFr)
member
Dec. 31, 2019
CHF (SFr)
Members of the Executive Board      
Activity in loans to related parties      
Balance at beginning of period SFr 13 SFr 32 SFr 33
Additions 8 5 13
Reductions (4) (24) (14)
Balance at end of period SFr 17 SFr 13 32
Loans to members of the Executive Board, number of members | member 7 4  
Loans to members of the Executive Board, term (in years) | year 10    
Highest loan outstanding with an individual Executive Board member SFr 4    
Members of the Board of Directors      
Activity in loans to related parties      
Balance at beginning of period 9 SFr 9 10
Additions 2 0 3
Reductions (4) 0 (4)
Balance at end of period SFr 7 SFr 9 9
Loans to members of the Board of Directors, number of members | member 3 3  
Loans made by Group or any of its subsidiaries to equity method investees      
Activity in loans to related parties      
Balance at beginning of period SFr 414 SFr 299 253
Net borrowings/(repayments) (36) 115 46
Balance at end of period 378 414 299
Bank      
Activity in loans to related parties      
Balance at beginning of period 8,444    
Balance at end of period 8,683 8,444  
Bank | Members of the Executive Board      
Activity in loans to related parties      
Balance at beginning of period 13 32 33
Additions 8 5 13
Reductions (4) (24) (14)
Balance at end of period SFr 17 SFr 13 32
Loans to members of the Executive Board, number of members | member 7 4  
Bank | Members of the Board of Directors      
Activity in loans to related parties      
Balance at beginning of period SFr 9 SFr 9 10
Additions 2 0 3
Reductions (4) 0 (4)
Balance at end of period SFr 7 SFr 9 SFr 9
Loans to members of the Board of Directors, number of members | member 3 3