v3.26.1
Post employment benefits - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions
12 Months Ended
Jun. 30, 2027
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2030
USD ($)
Dec. 31, 2030
GBP (£)
Dec. 31, 2030
EUR (€)
Dec. 31, 2027
USD ($)
Dec. 31, 2027
EUR (€)
Disclosure of defined benefit plans [line items]                  
Defined contribution plans   $ 72 $ 70 $ 62          
Cash contributions to plans on next year $ 59                
Inventories   $ 10,529 $ 10,658            
United Kingdom                  
Disclosure of defined benefit plans [line items]                  
Hedging instrument, interest rate   97.00% 96.00%            
Hedging instrument, inflation rate   100.00% 100.00%            
Percentage of UK plans of total plan liabilities   65.00%              
Inventories   $ 739 $ 926            
United Kingdom | Contingent liability arising from post-employment benefit obligations | Maximum                  
Disclosure of defined benefit plans [line items]                  
Cash contributions to plans on next year         $ 569 £ 430      
Ireland                  
Disclosure of defined benefit plans [line items]                  
Hedging instrument, interest rate   93.00% 93.00%            
Hedging instrument, inflation rate   75.00% 109.00%            
Ireland | Contingent liability arising from post-employment benefit obligations | Maximum                  
Disclosure of defined benefit plans [line items]                  
Cash contributions to plans on next year         $ 44   € 39 $ 44 € 39