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Post employment benefits - Timing of benefit payments and average duration of defined benefit obligations and distribution of timing of benefit payments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | $ 0 | $ 0
United Kingdom |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | $ 10,985 | $ 11,012
Average duration of the defined benefit obligation | 14 years | 14 years
United Kingdom | Within one year |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | $ 311 | $ 382
United Kingdom | Between 1 to 5 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 1,225 | 1,373
United Kingdom | Between 6 to 15 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 3,123 | 3,073
United Kingdom | Between 16 to 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 2,948 | 2,827
United Kingdom | Beyond 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 3,378 | 3,357
Ireland |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | $ 2,963 | $ 3,224
Average duration of the defined benefit obligation | 14 years | 14 years
Ireland | Within one year |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | $ 88 | $ 92
Ireland | Between 1 to 5 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 441 | 462
Ireland | Between 6 to 15 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 870 | 916
Ireland | Between 16 to 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 748 | 813
Ireland | Beyond 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 816 | 941
United States |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | $ 1,263 | $ 1,204
Average duration of the defined benefit obligation | 9 years | 9 years
United States | Within one year |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | $ 64 | $ 72
United States | Between 1 to 5 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 216 | 219
United States | Between 6 to 15 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 456 | 417
United States | Between 16 to 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 297 | 260
United States | Beyond 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | $ 230 | $ 236

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- Definition The amount of benefits paid or payable for retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2023-01-01 -Paragraph 35 -Subparagraph b -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2023-en-r&anchor=para_35_b_v&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_147_c&doctype=Standard -URIDate 2023-03-23 + Details
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