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Financial instruments and risk management - Capital management - Narrative (Details)
£ in Millions
 12 Months Ended
Jun. 30, 2023
GBP (£)
Jun. 30, 2022
GBP (£)
Disclosure of detailed information about financial instruments [line items]    
Adjusted net borrowings to adjusted EBITDA ratio 2.6  
Adjusted net borrowings £ 15,914  
Post-employment benefit liabilities before tax 373 £ 402
Adjusted EBITDA £ 6,120  
Minimum    
Disclosure of detailed information about financial instruments [line items]    
Adjusted net borrowings to adjusted EBITDA ratio 2.5  
Maximum    
Disclosure of detailed information about financial instruments [line items]    
Adjusted net borrowings to adjusted EBITDA ratio 3.0