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Compensation and benefits (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Compensation and benefits      
Salaries and variable compensation SFr 7,733 SFr 7,449 SFr 8,421
Social security 554 567 620
Other 818 848 923
Compensation and benefits 9,105 8,864 9,964
Defined benefit and defined contribution      
Compensation and benefits      
Defined Benefit Plan, Service Cost 502 533  
International | Defined benefit pension plans      
Compensation and benefits      
Defined Benefit Plan, Service Cost 14 16 22
International | Other post-retirement defined benefit plans      
Compensation and benefits      
Defined Benefit Plan, Service Cost SFr 0 SFr 0 SFr 0