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Defined benefit plans (Detail 7)
Dec. 31, 2020
Dec. 31, 2019
Swiss pension plan    
Disclosure Of Defined Benefit Plans [Line Items]    
Discount rate 0.10% 0.29%
Rate of salary increase 2.00% 1.50%
Rate of pension increase 0.00% 0.00%
Rate of interest credit on retirement savings 0.60% 0.49%
UK pension plan    
Disclosure Of Defined Benefit Plans [Line Items]    
Discount rate 1.42% 2.07%
Rate of salary increase 0.00% 0.00%
Rate of pension increase 2.89% 2.92%
Rate of interest credit on retirement savings 0.00% 0.00%
US and German pension plans    
Disclosure Of Defined Benefit Plans [Line Items]    
Discount rate [1] 1.62% 2.58%
Rate of salary increase [1] 2.25% 2.37%
Rate of pension increase [1] 1.70% 1.80%
Rate of interest credit on retirement savings [1] 1.12% 2.57%
UBS AG | Swiss pension plan    
Disclosure Of Defined Benefit Plans [Line Items]    
Discount rate 0.10% 0.29%
Rate of salary increase 2.00% 1.50%
Rate of pension increase 0.00% 0.00%
Rate of interest credit on retirement savings 0.60% 0.49%
UBS AG | UK pension plan    
Disclosure Of Defined Benefit Plans [Line Items]    
Discount rate 1.42% 2.07%
Rate of salary increase 0.00% 0.00%
Rate of pension increase 2.89% 2.92%
Rate of interest credit on retirement savings 0.00% 0.00%
UBS AG | US and German pension plans    
Disclosure Of Defined Benefit Plans [Line Items]    
Discount rate [1] 1.62% 2.58%
Rate of salary increase [1] 2.25% 2.37%
Rate of pension increase [1] 1.70% 1.80%
Rate of interest credit on retirement savings [1] 1.12% 2.57%
[1]
Represents weighted average assumptions across US and German plans.