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Performance B.4.1. Share-based compensation - Assumptions (Details)
 12 Months Ended
Dec. 31, 2021
year
$ / shares
Performance share plan 2021 (Relative TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % 0.29%
Dividend yield % 1.28%
Share price volatility % 46.28%
Award term (years) | year 2.82
Share fair value | $ / shares $ 52.99
Performance share plan 2020 (Relative TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % 0.61%
Dividend yield % 1.47%
Share price volatility % 24.54%
Award term (years) | year 2.93
Share fair value | $ / shares $ 55.66
Performance share plan 2019 (Relative TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % (0.24%)
Dividend yield % 3.01%
Share price volatility % 26.58%
Award term (years) | year 2.93
Share fair value | $ / shares $ 49.79
Performance share plan 2018 (Relative TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % (0.39%)
Dividend yield % 3.21%
Share price volatility % 30.27%
Award term (years) | year 2.93
Share fair value | $ / shares $ 57.70