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Employees - Summary of Assumptions, Weighted by Liabilities for Valuation of Defined Benefit Plans (Details)
Dec. 31, 2021
Dec. 31, 2020
Defined benefit pension plans    
Disclosure of defined benefit plans [line items]    
Discount rate (in percent) 1.80% 1.30%
Inflation (in percent) 2.60% 2.20%
Rate of increase in salaries (in percent) 3.20% 2.90%
Rate of increase for pensions in payment (where provided) (in percent) 2.50% 2.10%
Rate of increase for pensions in deferment (where provided) (in percent) 2.70% 2.30%
Other post- employment benefit plans    
Disclosure of defined benefit plans [line items]    
Discount rate (in percent) 3.60% 3.30%
Rate of increase in salaries (in percent) 3.00% 3.00%
Long-term medical cost inflation (in percent) 5.10% 5.10%