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Financial instruments and risk management - Schedule of net borrowings interest rate profile (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
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Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | $ 21,017 | $ 19,582 | $ 17,107
Net borrowings interest rate | 100.00% | 100.00% |
Fixed rate |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | $ 16,174 | $ 15,071 |
Net borrowings interest rate | 77.00% | 77.00% |
Floating rate |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | $ 4,384 | $ 4,064 |
Net borrowings interest rate | 21.00% | 21.00% |
Impact of financial derivatives and fair value adjustments |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | $ (145) | $ (117) |
Net borrowings interest rate | (1.00%) | (1.00%) |
Lease liabilities |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | $ 604 | $ 564 |
Net borrowings interest rate | 3.00% | 3.00% |

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