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Post employment benefits - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions
12 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2030
USD ($)
Dec. 31, 2030
GBP (£)
Dec. 31, 2030
EUR (€)
Dec. 31, 2027
USD ($)
Dec. 31, 2027
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Disclosure of defined benefit plans [line items]                      
Defined contribution plans   $ 70 $ 62 $ 53              
Cash contributions to plans on next year $ 45                    
Inventories   $ 10,658 $ 9,720                
United Kingdom                      
Disclosure of defined benefit plans [line items]                      
Hedging instrument, interest rate   96.00% 95.00%                
Hedging instrument, inflation rate   100.00% 100.00%                
Percentage of UK plans of total plan liabilities   65.00%                  
Inventories   $ 926 $ 819                
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         $ 589 £ 430          
Ireland                      
Disclosure of defined benefit plans [line items]                      
Hedging instrument, interest rate   93.00% 90.00%                
Hedging instrument, inflation rate   109.00% 112.00%                
Ireland | Contingent liability arising from post-employment benefit obligations | Maximum                      
Disclosure of defined benefit plans [line items]                      
Cash contributions to plans on next year         $ 46   € 39 $ 46 € 39 $ 41 € 35