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Performance B.4.1. Share-based compensation - Assumptions (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
year
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 | $ $ 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 | $ $ 57.70
Performance share plan 2017 (Relative TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % (0.40%)
Dividend yield % 3.80%
Share price volatility % 22.50%
Award term (years) | year 2.92
Share fair value | $ $ 27.06
Performance share plan 2017 (Absolute TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % (0.40%)
Dividend yield % 3.80%
Share price volatility % 22.50%
Award term (years) | year 2.92
Share fair value | $ $ 29.16
Performance share plan 2016 (Relative TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % (0.65%)
Dividend yield % 3.49%
Share price volatility % 30.00%
Award term (years) | year 2.61
Share fair value | $ $ 43.35
Performance share plan 2016 (Absolute TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % (0.65%)
Dividend yield % 3.49%
Share price volatility % 30.00%
Award term (years) | year 2.61
Share fair value | $ $ 45.94
Performance share plan 2015 (Absolute TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % (0.32%)
Dividend yield % 2.78%
Share price volatility % 23.00%
Award term (years) | year 2.57
Share fair value | $ $ 32.87
Executive share plan 2015 – Component A  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % (0.32%)
Share price volatility % 23.00%
Award term (years) | year 2.57
Share fair value | $ $ 53.74
Executive share plan 2015 – Component B  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free rate % (0.32%)
Share price volatility % 23.00%
Award term (years) | year 2.57
Share fair value | $ $ 29.53