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Employee benefits - Actuarial Assumptions (Details)
Dec. 31, 2019
Dec. 31, 2018
Germany | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 1.15% 1.75%
Inflation rate 2.00% 2.00%
Rate of increase in salaries 2.80% 2.80%
Long term medical cost of inflation 0.00% 0.00%
Germany | Post-employment medical benefits and other benefits    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.45% 1.20%
Inflation rate 2.00% 2.00%
Rate of increase in salaries 2.80% 2.80%
Rate of increase for pensions in payment 0.00% 0.00%
Long term medical cost of inflation 0.00% 0.00%
Sweden | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 1.45% 2.25%
Inflation rate 1.80% 2.00%
Rate of increase in salaries 2.80% 2.75%
Rate of increase for pensions in payment 0.00% 0.00%
Long term medical cost of inflation 0.00% 0.00%
Austria | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 1.00% 2.00%
Inflation rate 1.53% 2.00%
Rate of increase in salaries 2.00% 3.00%
Rate of increase for pensions in payment 2.00% 2.00%
Long term medical cost of inflation 0.00% 0.00%
Austria | Post-employment medical benefits and other benefits    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.30% 1.00%
Inflation rate 1.53% 2.00%
Rate of increase in salaries 3.00% 3.00%
Rate of increase for pensions in payment 0.00% 0.00%
Long term medical cost of inflation 2.00% 2.00%
Italy    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate 0.67% 1.60%
Inflation rate 1.50% 1.50%
Rate of increase in salaries 0.00% 0.00%
Rate of increase for pensions in payment 0.00% 0.00%
Long term medical cost of inflation 0.00% 0.00%
Bottom of range | Germany | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Rate of increase for pensions in payment 1.00% 1.00%
Top of range | Germany | Defined benefit retirement plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Rate of increase for pensions in payment 2.00% 2.00%