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Pension and other post-retirement benefits - Obligation and funded status (Details) - CHF (SFr)
SFr in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Total benefit costs            
Service costs on benefit obligation SFr 65 SFr 65 SFr 60 SFr 130 SFr 120  
Interest costs on benefit obligation 25 25 15 50 30  
Expected return on plan assets (126) (126) (120) (252) (243)  
Amortization of recognized prior service cost/(credit) (22) (21) (31) (43) (60)  
Amortization of recognized actuarial losses/(gains) 72 73 93 145 186  
Settlement losses/(gains) 2 3 2 5 (8)  
Curtailment losses/(gains) 0 0 2 0 1  
Special termination benefits 1 1 3 2 13  
Net periodic benefit/(costs) 17 20 24 37 39  
PBO            
Service costs 65 65 60 130 120  
Interest costs 25 25 15 50 30  
Total amount recognized            
Noncurrent assets 4,376 4,306   4,376   SFr 4,215
Pension and Other Postretirement Benefit Contributions            
Contributions expected to be made by the company by the end of the current fiscal year 284     284    
Contributions made to defined benefit pension plans and other post-retirement defined benefit plans       147    
Defined benefit and defined contribution            
Total benefit costs            
Service costs on benefit obligation 131 128 120 259 250  
PBO            
Service costs 131 SFr 128 SFr 120 259 250  
Bank            
Total amount recognized            
Noncurrent assets 924     924   SFr 974
Bank | Defined benefit and defined contribution            
Total benefit costs            
Service costs on benefit obligation       230 250  
PBO            
Service costs       230 250  
Bank | International            
Total benefit costs            
Service costs on benefit obligation       8 7  
Interest costs on benefit obligation       30 25  
Expected return on plan assets       (33) (34)  
Amortization of recognized prior service cost/(credit)       1 1  
Amortization of recognized actuarial losses/(gains)       5 8  
Settlement losses/(gains)       0 (10)  
Net periodic benefit/(costs)       11 (3)  
PBO            
Service costs       8 7  
Interest costs       30 SFr 25  
Bank | International | Defined benefit pension plans            
Pension and Other Postretirement Benefit Contributions            
Contributions expected to be made by the company by the end of the current fiscal year 14     14    
Contributions made to defined benefit pension plans and other post-retirement defined benefit plans       7    
Bank | International | Other post-retirement defined benefit plans            
Pension and Other Postretirement Benefit Contributions            
Contributions expected to be made by the company by the end of the current fiscal year SFr 11     11    
Contributions made to defined benefit pension plans and other post-retirement defined benefit plans       SFr 5