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Group statement of changes in equity (Parenthetical) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Statement of changes in equity [abstract]    
Dividends per share: Ordinary - paid during the period (USD per share) $ 4.170 $ 3.090
Dividends per share: Special - paid during the period (in USD per share) 0.620 0.930
Ordinary dividends per share: announced with the results for the period (in USD per share) 2.670 3.760
Special dividends per share: announced with the results for the period (in USD per share) $ 0 $ 1.850