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Earnings per share (Details)
£ / shares in Units, £ in Millions, shares in Millions
 12 Months Ended
Aug. 30, 2022
Dec. 31, 2023
GBP (£)
£ / shares
shares
Dec. 31, 2022
GBP (£)
£ / shares
shares
Dec. 31, 2021
GBP (£)
£ / shares
shares
Earnings per share        
Profit from continuing operations attributable to ordinary shareholders | £   £ 4,506 £ 3,602 £ 2,486
(Loss)/profit from discontinued operations attributable to ordinary shareholders | £   (112) (262) 464
Profit attributable to ordinary shareholders | £   £ 4,394 £ 3,340 £ 2,950 [1]
Weighted average number of shares        
Weighted average number of ordinary shares outstanding during the year | shares   9,164 9,872 10,792
Effect of dilutive share options and convertible securities | shares   55 57 45
Diluted weighted average number of ordinary shares outstanding during the year | shares   9,219 9,929 10,837
Earnings per ordinary share - continuing operations   £ 0.49170 £ 0.365 £ 0.230 [1]
Earnings per ordinary share - discontinued operations   (0.01222) (0.027) 0.043 [1]
Total earnings per share attributable to ordinary shareholders - basic [2]   0.47948 0.338 0.273 [1]
Earnings per ordinary share - fully diluted continuing operations   0.489 0.362 0.229 [1]
Earnings per ordinary share - fully diluted discontinued operations   (0.012) (0.026) 0.043 [1]
Total earnings per share attributable to ordinary shareholders - fully diluted   £ 0.477 £ 0.336 £ 0.272 [1]
Share consolidation ratio 0.9286      
[1] Comparative results have been re-presented from those previously published to reclassify certain items as discontinued operations as described in Note 8 to the consolidated financial statements.
[2] In 2023, the unrounded Total earnings per share attributable to ordinary shareholders – basic is 47.948p. The unrounded Earnings per ordinary share – continuing operations was 49.170p. The unrounded Earnings per ordinary share – discontinued operations was (1.222p).