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Equity - Schedule of movements in own shares (Details) - GBP (£)
£ in Millions, shares in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of classes of share capital [line items]      
Beginning balance £ (9,514) £ (8,431) £ (8,440)
Ending balance £ (9,292) £ (9,514) £ (8,431)
Own shares      
Disclosure of classes of share capital [line items]      
Beginning balance (in shares) 219 223 227
Beginning balance £ 1,838 £ 1,877 £ 1,936
Ending balance (in shares) 216 219 223
Ending balance £ 1,814 £ 1,838 £ 1,877
Own shares | Share trust arrangements      
Disclosure of classes of share capital [line items]      
Increase (decrease) due to share based payment transactions (in shares) (1) (2) (1)
Increase (decrease) due to share based payment transactions £ (12) £ (23) £ (11)
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) (2) (3)
Increase (decrease) due to share based payment transactions £ (12) £ (16) £ (48)
Own shares | Share buyback programme      
Disclosure of classes of share capital [line items]      
Number of shares purchased - share buyback programme (in shares) 38 61 3
Shares purchased - share buyback programme £ 1,381 £ 2,284 £ 109
Shares cancelled (in shares) (38) (61) (3)
Shares cancelled £ (1,381) £ (2,284) £ (109)