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Share capital, share premium and own shares - Share capital and premium (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
shares
Nov. 30, 2024
shares
Oct. 31, 2024
shares
Sep. 30, 2024
shares
Aug. 31, 2024
shares
Jul. 31, 2024
shares
Jun. 30, 2024
shares
Jan. 31, 2024
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Options
shares
Dec. 31, 2024
Options
£ / shares
Dec. 31, 2023
Options
£ / shares
Dec. 31, 2021
Options
Disclosure of classes of share capital                            
Par value per share (in GBP per share) | £ / shares                       £ 0.05 £ 0.05  
Number of issued shares at beginning of period | shares               2,753,520,756 2,753,520,756 2,749,669,380        
Shares issued under share-based schemes | shares                 758,708 3,851,376        
Shares issued under scrip dividends | shares                 2,813,929          
Shares cancelled on repurchases/buybacks | shares (10,743,844) (18,244,807) (20,480,882) (23,590,670) (7,992,467) (11,940,672) (2,726,787) (3,851,376) (99,571,505)          
Number of issued shares at end of period | shares 2,657,521,888               2,657,521,888 2,753,520,756 2,749,669,380      
Balance at beginning of year               $ 17,983 $ 17,983 $ 16,898 $ 19,111      
Shares issued under share-based schemes                   4 (4)      
Shares issued under scrip dividends                 23          
Shares cancelled on repurchases/buybacks [1]                 (878)          
Balance at end of year $ 18,674               18,674 17,983 16,898      
Share capital                            
Disclosure of classes of share capital                            
Balance at beginning of year               183 183 182 182      
Shares issued under share-based schemes                   1        
Shares cancelled on repurchases/buybacks [1]                 (7)          
Balance at end of year 176               176 183 182      
Share premium                            
Disclosure of classes of share capital                            
Balance at beginning of year               $ 5,009 5,009 5,006 5,010      
Shares issued under share-based schemes                   3 (4)      
Balance at end of year $ 5,009               $ 5,009 $ 5,009 $ 5,006      
Sharesave and ISSOSNE                            
Options outstanding under save as you earn schemes                            
Number of shares under option | Options                     1,900,000 1,660,096 1,671,215 2,000,000
Sharesave and ISSOSNE | Minimum                            
Options outstanding under save as you earn schemes                            
Share price | £ / shares                       £ 5.20 £ 7.37  
Sharesave and ISSOSNE | Maximum                            
Options outstanding under save as you earn schemes                            
Share price | £ / shares                       £ 12.02 £ 14.55  
[1] In 2024, the Group entered into repurchase programmes to neutralise the dilutive effect of share scheme issuance and scrip dividends and is in progress of conducting the $2 billion share buyback programme it announced in June 2024 to return capital to shareholders. See note C8 for further details.