v3.26.1
Segmental information - Geographic analysis (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Disclosure of geographical areas [line items]      
Sales $ 27,762 $ 27,964 $ 27,891
Non-current assets 27,941 29,903 28,686
United States      
Disclosure of geographical areas [line items]      
Sales 7,408 8,138 8,041
Non-current assets 7,355 7,467 7,642
India      
Disclosure of geographical areas [line items]      
Sales 3,213 3,233 3,247
Non-current assets 1,945 2,173 2,207
Great Britain      
Disclosure of geographical areas [line items]      
Sales 3,158 2,989 2,849
Non-current assets 4,065 4,505 3,969
Rest of World      
Disclosure of geographical areas [line items]      
Sales 13,983 13,604 13,754
Non-current assets $ 14,576 $ 15,758 $ 14,868