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Financial instruments and risk management - Schedule of fluctuations in interest and exchange rates to vary from hypothetical amounts (Details)
£ in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2023
GBP (£)
Jun. 30, 2022
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Impact on income statement gain/(loss) $ 4,166 $ 4,479 [1],[2]   $ 4,410 [2],[3]
Total comprehensive gain/(loss) $ 3,681 3,997 [1]   $ 4,678 [1]
Interest rate risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable 0.50%      
Interest rate risk | 0.5% decrease in interest rates        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable (0.50%)      
Impact on income statement gain/(loss) $ 22 19    
Total comprehensive gain/(loss) $ 43 43    
Interest rate risk | 0.5% increase in interest rates        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable 0.50%      
Impact on income statement gain/(loss) $ (22) (19)    
Total comprehensive gain/(loss) $ (42) $ (41)    
Currency exchange risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable 10.00% 10.00% 10.00%  
Currency exchange risk | 10% weakening of US dollar        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable (10.00%)      
Impact on income statement gain/(loss) $ (39)      
Total comprehensive gain/(loss) $ (974)      
Currency exchange risk | 10% strengthening of US dollar        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable 10.00%      
Impact on income statement gain/(loss) $ 33      
Total comprehensive gain/(loss) $ 813      
Currency exchange risk | Ten percentage weakening of sterling [Member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Impact on income statement gain/(loss) | £     £ (45)  
Total comprehensive gain/(loss) | £     (1,336)  
Currency exchange risk | Ten percentage strengthening of sterling [Member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Impact on income statement gain/(loss) | £     36  
Total comprehensive gain/(loss) | £     £ 1,093  
[1] (1)  See pages 238-240 for an explanation under Accounting information and policies.
[2] (1)  See pages 238-240 for an explanation under Accounting information and policies.
[3] (1) See pages 238-240 for an explanation under Accounting information and policies.