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Financial instruments and risk management - Results of hedge relationships - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions
12 Months Ended
Jun. 30, 2023
GBP (£)
Jun. 30, 2022
GBP (£)
Jun. 30, 2021
GBP (£)
Jun. 30, 2020
GBP (£)
Jun. 30, 2019
GBP (£)
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
GBP (£)
Jun. 30, 2021
USD ($)
Disclosure of detailed information about financial instruments [line items]                
Notional amounts           € 900   $ 1,000
Accumulated fair value change on the statement of financial position for fair value hedges that are no longer applicable       £ (13)     £ (5)  
Cash flow hedges                
Disclosure of detailed information about financial instruments [line items]                
Gain (loss) on cash flow hedge instruments     £ (157) 173 £ 79      
Cash flow hedges | Forecast                
Disclosure of detailed information about financial instruments [line items]                
Gain (loss) to income statement £ (48) £ 66            
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     (10) (42) (45)      
Notional amounts       1,428     1,303  
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     (175) 75 82      
Notional amounts       1,667     1,475  
Loss reported in reserves in respect of hedges of foreign currency borrowing no longer applicable       20     20  
Cash flow hedges | Commodity price risk                
Disclosure of detailed information about financial instruments [line items]                
Other comprehensive income (loss) reclassified to operating profit         £ 0      
Notional amounts       133     93  
Cash flow hedges | Derivatives | Transaction exposure hedging risk                
Disclosure of detailed information about financial instruments [line items]                
Gain (loss) on cash flow hedge instruments     111 (1)        
Gain (loss) transferred out of other comprehensive income to other operating expenses     (26) (47)        
Cash flow hedges | Derivatives | Foreign currency debt risk                
Disclosure of detailed information about financial instruments [line items]                
Gain (loss) on cash flow hedge instruments     (123) 146        
Gain (loss) transferred out of other comprehensive income to other finance charges     (175) 75        
Cash flow hedges | Derivatives | Commodity price risk                
Disclosure of detailed information about financial instruments [line items]                
Gain (loss) on cash flow hedge instruments     39 (3)        
Other comprehensive income (loss) reclassified to operating profit     £ 2 (8)        
Fair value hedges | Interest rate risk                
Disclosure of detailed information about financial instruments [line items]                
Notional amounts       £ 6,092     £ 4,646