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Financial instruments and risk management - Results of hedge relationships - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about financial instruments [line items]          
Accumulated fair value change on the statement of financial position for fair value hedges that are no longer applicable     £ 0 £ (1)  
Cash flow hedges          
Disclosure of detailed information about financial instruments [line items]          
Gain (loss) on cash flow hedge instruments     247 124 £ (157)
Cash flow hedges | Transaction exposure hedging risk          
Disclosure of detailed information about financial instruments [line items]          
Gain (loss) transferred out of other comprehensive income to other operating expenses     (13) (42) (10)
Notional amounts     1,734 1,874  
Cash flow hedges | Foreign currency debt risk          
Disclosure of detailed information about financial instruments [line items]          
Gain (loss) transferred out of other comprehensive income to other finance charges     (54) 239 (175)
Notional amounts     873 1,694  
Loss reported in reserves in respect of hedges of foreign currency borrowing no longer applicable     18 19  
Cash flow hedges | Commodity price risk          
Disclosure of detailed information about financial instruments [line items]          
Notional amounts     217 234  
Cash flow hedges | Forecast          
Disclosure of detailed information about financial instruments [line items]          
Gain (loss) to income statement £ 20 £ 143      
Cash flow hedges | Derivatives | Transaction exposure hedging risk          
Disclosure of detailed information about financial instruments [line items]          
Gain (loss) on cash flow hedge instruments     260 (130)  
Gain (loss) transferred out of other comprehensive income to other operating expenses     (17) (11)  
Cash flow hedges | Derivatives | Foreign currency debt risk          
Disclosure of detailed information about financial instruments [line items]          
Gain (loss) on cash flow hedge instruments     60 (6)  
Gain (loss) transferred out of other comprehensive income to other finance charges     (54) 239  
Cash flow hedges | Derivatives | Commodity price risk          
Disclosure of detailed information about financial instruments [line items]          
Gain (loss) on cash flow hedge instruments     (89) 32  
Other comprehensive income (loss) reclassified to operating profit     33 46 £ 2
Fair value hedges | Interest rate risk          
Disclosure of detailed information about financial instruments [line items]          
Notional amounts     £ 3,999 £ 4,444