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Segmental information - Geographic analysis (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of geographical areas [line items]      
Sales $ 27,891 $ 28,270 [1] $ 29,751 [1]
Non-current assets 28,686 27,376 26,099
United States      
Disclosure of geographical areas [line items]      
Sales 8,041 8,366 8,415
Non-current assets 7,642 7,328 7,137
India      
Disclosure of geographical areas [line items]      
Sales 3,247 3,301 4,282
Non-current assets 2,207 2,265 2,899
Great Britain      
Disclosure of geographical areas [line items]      
Sales 2,849 2,565 2,848
Non-current assets 3,969 3,665 2,920
Rest of World      
Disclosure of geographical areas [line items]      
Sales 13,754 14,038 14,206
Non-current assets $ 14,868 $ 14,118 $ 13,143
[1] (1)  See pages 238-240 for an explanation under Accounting information and policies.