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Equity - Schedule of movements in hedging and exchange reserve (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of reserves within equity [line items]      
Beginning balance £ 9,514 £ 8,431 £ 8,440
Other comprehensive income/(loss) (802) 1,482 (865)
Ending balance 9,292 9,514 8,431
Cost of hedging reserve 20 22 22
Hedging reserve      
Disclosure of reserves within equity [line items]      
Beginning balance 26 113 93
Other comprehensive income/(loss) 216 (87) 20
Ending balance 242 26 113
Exchange reserve      
Disclosure of reserves within equity [line items]      
Beginning balance (1,072) (1,694) (1,022)
Other comprehensive income/(loss) (540) 622 (672)
Ending balance (1,612) (1,072) (1,694)
Hedging and exchange reserve      
Disclosure of reserves within equity [line items]      
Beginning balance (1,046) (1,581) (929)
Other comprehensive income/(loss) (324) 535 (652)
Ending balance £ (1,370) £ (1,046) £ (1,581)