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Financial instruments and risk management - Capital management - Narrative (Details)
£ in Millions
 12 Months Ended
Jun. 30, 2021
GBP (£)
Jun. 30, 2020
GBP (£)
Disclosure of detailed information about financial instruments [line items]    
Adjusted net borrowings to adjusted EBITDA ratio 2.8  
Adjusted Net Borrowings £ 12,683  
Post-employment benefit liabilities before tax 574 £ 749
Adjusted EBITDA £ 4,527  
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