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Segmental information - Geographical analysis (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of geographical areas [line items] |  |
Sales | $ 15,176 | $ 15,181
United States |  |
Disclosure of geographical areas [line items] |  |
Sales | 4,171 | 4,158
India |  |
Disclosure of geographical areas [line items] |  |
Sales | 1,744 | 1,687
Great Britain |  |
Disclosure of geographical areas [line items] |  |
Sales | 1,622 | 1,571
Rest of World |  |
Disclosure of geographical areas [line items] |  |
Sales | $ 7,639 | $ 7,765

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