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Pension and other post-retirement benefits - Mortality tables and life expectancies (Details 9) - year
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
BVG 2020 [Member]    
Defined benefit plan, Disclosure    
Continuous Mortality Investigation (CMI) model, long-term improvement rate 1.25%  
SAPS S3 [Member]    
Defined benefit plan, Disclosure    
Continuous Mortality Investigation (CMI) model, long-term improvement rate 1.25%  
Switzerland | BVG 2020 [Member] | 65    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [1] 21.7 21.7
Life expectancy rate at age 65, Female [1] 23.5 23.4
Switzerland | BVG 2020 [Member] | 45    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [1] 23.4 23.3
Life expectancy rate at age 65, Female [1] 25.1 25.0
UK | SAPS S3 [Member] | 65    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [2] 23.5 23.5
Life expectancy rate at age 65, Female [2] 25.1 25.0
UK | SAPS S3 [Member] | 45    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [2] 24.8 24.7
Life expectancy rate at age 65, Female [2] 26.5 26.4
US | Pri-2012 [Member] | 65    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [3] 20.7 20.6
Life expectancy rate at age 65, Female [3] 22.6 22.5
US | Pri-2012 [Member] | 45    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [3] 21.9 21.8
Life expectancy rate at age 65, Female [3] 23.7 23.7
Bank | SAPS S3 [Member]    
Defined benefit plan, Disclosure    
Continuous Mortality Investigation (CMI) model, long-term improvement rate 1.25%  
Bank | UK | SAPS S3 [Member] | 65    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [4] 23.5 23.5
Life expectancy rate at age 65, Female [4] 25.1 25.0
Bank | UK | SAPS S3 [Member] | 45    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [4] 24.8 24.7
Life expectancy rate at age 65, Female [4] 26.5 26.4
Bank | US | Pri-2012 [Member] | 65    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [5] 20.7 20.6
Life expectancy rate at age 65, Female [5] 22.6 22.5
Bank | US | Pri-2012 [Member] | 45    
Defined benefit plan, Disclosure    
Life expectancy rate at age 65, Male [5] 21.9 21.8
Life expectancy rate at age 65, Female [5] 23.7 23.7
[1] The BVG 2020 tables were used, which included CMI projections, with a long-term rate of improvement of 1.25% per annum.
[2] 102% of Self-Administered Pension Scheme (SAPS) S3 light tables were used, which included CMI projections, with a long-term rate of improvement of 1.25% per annum.
[3] The Private retirement plan 2012 (Pri-2012) mortality tables were used, with projections based on the Social Security Administration's intermediate improvement scale.
[4] 102% of Self-Administered Pension Scheme (SAPS) S3 light tables were used, which included CMI projections, with a long-term rate of improvement of 1.25% per annum.
[5] The Private retirement plan 2012 (Pri-2012) mortality tables were used, with projections based on the Social Security Administration's intermediate improvement scale.