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Equity - Schedule of movements in own shares (Details) - GBP (£)
£ in Millions, shares in Millions
4 Months Ended 8 Months Ended 12 Months Ended 31 Months Ended
Jun. 30, 2022
Oct. 05, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Feb. 11, 2022
Disclosure of classes of share capital [line items]              
Beginning balance     £ (9,514) £ (8,431) £ (8,440) £ (10,156)  
Ending balance £ (9,514)     £ (9,514) £ (8,431) £ (8,440)  
Own shares              
Disclosure of classes of share capital [line items]              
Beginning balance (in shares)     219 223 227 232  
Beginning balance     £ 1,838 £ 1,877 £ 1,936 £ 2,026  
Ending balance (in shares) 219     219 223 227  
Ending balance £ 1,838     £ 1,838 £ 1,877 £ 1,936  
Own shares | Share trust arrangements              
Disclosure of classes of share capital [line items]              
Increase (decrease) due to share based payment transactions (in shares)       (2) (1) (1)  
Increase (decrease) due to share based payment transactions       £ (23) £ (11) £ (7)  
Own shares | Shares used to satisfy options              
Disclosure of classes of share capital [line items]              
Increase (decrease) due to share based payment transactions (in shares)       (2) (3) (4)  
Increase (decrease) due to share based payment transactions       £ (16) £ (48) £ (83)  
Own shares | Share buyback programme              
Disclosure of classes of share capital [line items]              
Number of shares purchased - share buyback programme (in shares)       61 3 39  
Shares purchased - share buyback programme £ 1,400 £ 1,700 £ 900 £ 2,284 £ 109 £ 1,282 £ 2,250
Shares cancelled (in shares)       (61) (3) (39)  
Shares cancelled       £ (2,284) £ (109) £ (1,282)