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Financial instruments and risk management - Schedule of effectiveness and impacts of hedging relationships (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about hedges [line items]      
Net financial assets (liabilities) at the beginning of the year £ (17,500)    
Net financial assets (liabilities) at the end of the year (18,120) £ (17,500)  
Cash flow hedges      
Disclosure of detailed information about hedges [line items]      
Consolidated comprehensive income, cash flow hedges 247 124 £ (157)
Cash flow hedges | Foreign currency debt risk      
Disclosure of detailed information about hedges [line items]      
Derivatives in cash flow hedge (foreign currency debt) (54) 239 (175)
Cash flow hedges | Foreign currency exchange risk      
Disclosure of detailed information about hedges [line items]      
Derivatives in cash flow hedge (foreign currency risk) (13) (42) (10)
Fair value hedges      
Disclosure of detailed information about hedges [line items]      
Fair value hedge hedged item at beginning end of the year 276 (65)  
Instruments in fair value hedge relationship at the beginning of the year (7) (2)  
Fair value hedge hedged item 96 341  
Income statement, Instruments in fair value hedge relationship 2 (5)  
Fair value hedge hedged item at the end of the year 372 276 (65)
Instruments in fair value hedge relationship at the end of the year (5) (7) (2)
Derivatives | Net investment hedges | Foreign exchange risk      
Disclosure of detailed information about hedges [line items]      
Net financial assets (liabilities) at the beginning of the year (1) 0  
Income statement, net investment hedge 0 0  
Consolidated comprehensive income, net investment hedge 0 5  
Other movements 1 (6)  
Net financial assets (liabilities) at the end of the year 0 (1) 0
Derivatives | Cash flow hedges | Foreign currency debt risk      
Disclosure of detailed information about hedges [line items]      
Net financial assets (liabilities) at the beginning of the year 367 154  
Derivatives in cash flow hedge (foreign currency debt) (54) 239  
Consolidated comprehensive income, cash flow hedges 60 (6)  
Other movements (25) (20)  
Net financial assets (liabilities) at the end of the year 348 367 154
Derivatives | Cash flow hedges | Foreign currency exchange risk      
Disclosure of detailed information about hedges [line items]      
Net financial assets (liabilities) at the beginning of the year (77) 53  
Derivatives in cash flow hedge (foreign currency risk) (17) (11)  
Consolidated comprehensive income, cash flow hedges 260 (130)  
Other movements 17 11  
Net financial assets (liabilities) at the end of the year 183 (77) 53
Derivatives | Cash flow hedges | Commodity price risk      
Disclosure of detailed information about hedges [line items]      
Net financial assets (liabilities) at the beginning of the year 50 16  
Derivatives in cash flow hedge (commodity price risk) 33 46 2
Consolidated comprehensive income, cash flow hedges (89) 32  
Other movements (19) (44)  
Net financial assets (liabilities) at the end of the year (25) 50 16
Derivatives | Fair value hedges | Interest rate risk      
Disclosure of detailed information about hedges [line items]      
Net financial assets (liabilities) at the beginning of the year (283) 63  
Derivatives in fair value hedge (interest rate risk) (94) (346)  
Net financial assets (liabilities) at the end of the year £ (377) £ (283) £ 63