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Financial instruments and risk management - Effectiveness of hedging relationships (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about hedges [line items]      
Net financial assets (liabilities) at the beginning of the year £ (15,061)    
Net financial assets (liabilities) at the end of the year (14,679) £ (15,061)  
Cash flow hedges      
Disclosure of detailed information about hedges [line items]      
Consolidated comprehensive income, cash flow hedges (157) 173 £ 79
Cash flow hedges | Foreign currency debt risk      
Disclosure of detailed information about hedges [line items]      
Derivatives in cash flow hedge (foreign currency debt) (175) 75 82
Cash flow hedges | Foreign currency exchange risk      
Disclosure of detailed information about hedges [line items]      
Derivatives in cash flow hedge (foreign currency exchange risk) (10) (42) (45)
Cash flow hedges | Commodity price risk      
Disclosure of detailed information about hedges [line items]      
Derivatives in cash flow hedge (commodity price risk)     0
Fair value hedges      
Disclosure of detailed information about hedges [line items]      
Fair value hedge hedged item at beginning end of the year (189) (103)  
Instruments in fair value hedge relationship at the beginning of the year 0 1  
Fair value hedge hedged item 124 (86)  
Income statement, Instruments in fair value hedge relationship (2) (1)  
Fair value hedge hedged item at the end of the year (65) (189) (103)
Instruments in fair value hedge relationship at the end of the year (2) 0 1
Derivatives | Net investment hedges      
Disclosure of detailed information about hedges [line items]      
Net financial assets (liabilities) at the beginning of the year 0 (1)  
Income statement, net investment hedge   0  
Consolidated comprehensive income, net investment hedge   (1)  
Other movements   2  
Net financial assets (liabilities) at the end of the year   0 (1)
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 0    
Income statement, net investment hedge 0    
Consolidated comprehensive income, net investment hedge 3    
Other movements (3)    
Net financial assets (liabilities) at the end of the year 0 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 469 271  
Derivatives in cash flow hedge (foreign currency debt) (175) 75  
Consolidated comprehensive income, cash flow hedges (123) 146  
Other movements (17) (23)  
Net financial assets (liabilities) at the end of the year 154 469 271
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 (58) (57)  
Derivatives in cash flow hedge (foreign currency exchange risk) (26) (47)  
Consolidated comprehensive income, cash flow hedges 111 (1)  
Other movements 26 47  
Net financial assets (liabilities) at the end of the year 53 (58) (57)
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 (9) (9)  
Derivatives in cash flow hedge (commodity price risk) 2 (8)  
Consolidated comprehensive income, cash flow hedges 39 (3)  
Other movements (16) 11  
Net financial assets (liabilities) at the end of the year 16 (9) (9)
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 189 104  
Derivatives in fair value hedge (interest rate risk) (126) 85  
Net financial assets (liabilities) at the end of the year £ 63 £ 189 £ 104