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Post employment benefits - Narrative (Details) € in Millions, £ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | 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 |  | $ 62 | $ 53 |  | $ 44 |  |  |  |  |  |  |  |
Cash contributions to plans on next year | $ 55 |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  | $ 9,720 | $ 9,653 | [1] | $ 8,584 | [1] |  |  |  |  |  |  |
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Hedging instrument, interest rate |  | 95.00% | 97.00% |  |  |  |  |  |  |  |  |  |
Hedging instrument, inflation rate |  | 100.00% | 98.00% |  |  |  |  |  |  |  |  |  |
Percentage of UK plans of total plan liabilities |  | 65.00% |  |  |  |  |  |  |  |  |  |  |
Inventories |  | $ 648 | $ 923 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 542 | £ 430 |  |  |  |  |
Ireland |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Hedging instrument, interest rate |  | 90.00% | 92.00% |  |  |  |  |  |  |  |  |  |
Hedging instrument, inflation rate |  | 112.00% | 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 |  |  |  |  |  |  | $ 36 |  | € 39 | $ 36 | € 39 | $ 33 | € 35
[1] | (1) See pages 238-240 for an explanation under Accounting information and policies.

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