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Post employment benefits - Plan assets and liabilities by type of post employment benefit and country (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
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Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | $ 721 | $ 748 | $ 1,410
Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 8,417 | 8,624 | 10,163
Plan liabilities |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (7,696) | (7,876) | $ (8,753)
Pensions | Plan assets | United Kingdom |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 5,654 | 5,771 |
Pensions | Plan assets | Ireland |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 1,954 | 1,999 |
Pensions | Plan assets | United States |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 569 | 555 |
Pensions | Plan assets | Other |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 216 | 227 |
Pensions | Plan liabilities | United Kingdom |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (5,028) | (5,094) |
Pensions | Plan liabilities | Ireland |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (1,595) | (1,650) |
Pensions | Plan liabilities | United States |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (534) | (516) |
Pensions | Plan liabilities | Other |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (241) | (244) |
Post-employment medical | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 3 | 3 |
Post-employment medical | Plan liabilities |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (266) | (288) |
Other post-employment | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 21 | 69 |
Other post-employment | Plan liabilities |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | $ (32) | $ (84) |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_140_a&doctype=Standard -URIDate 2023-03-23 + Details
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