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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2023
Earnings per share [abstract]  
Disclosure of detailed information on earnings per share
Basic and diluted earnings per share
Half-year to1
30 Jun 202330 Jun 2022
ProfitNumber
of shares		Amount per shareProfitNumber
of shares		Amount per share
$m(millions)$$m(millions)$
Basic2
16,966 19,693 0.86 7,966 19,954 0.40 
Effect of dilutive potential ordinary shares136 131 
Diluted2
16,966 19,829 0.86 7,966 20,085 0.40 
1From 1 January 2023, we adopted IFRS 17 ‘Insurance Contracts’, which replaced IFRS 4 ‘Insurance Contracts’. Comparative data have been restated accordingly.
2Weighted average number of ordinary shares outstanding (basic) or assuming dilution (diluted).