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Group statement of changes in equity (Parenthetical) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Statement of changes in equity [abstract]    
Dividends per share: Ordinary - paid during the period (USD per share) $ 2.250 $ 4.170
Dividends per share: Special - paid during the period (in USD per share) 0 0.620
Ordinary dividends per share: announced with the results for the period (in USD per share) $ 1.770 $ 2.670