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Financial instruments and risk management - Results of hedge relationships - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Cash flow hedges(1) |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | $ 13 | $ 297 | $ 163
Cash flow hedges(1) | Transaction exposure hedging risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) transferred out of other comprehensive income to other operating expenses |  |  | 266 | 16 | (57)
Notional amounts |  |  | 1,855 | 2,185 |
Cash flow hedges(1) | Foreign currency debt risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) transferred out of other comprehensive income to other finance charges |  |  | (152) | (65) | 319
Notional amounts |  |  | 2,747 | 1,100 |
Loss reported in reserves in respect of hedges of foreign currency borrowing no longer applicable |  |  | 24 | 22 |
Cash flow hedges(1) | Commodity price risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amounts |  |  | 207 | 273 |
Cash flow hedges(1) | Forecast |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) to income statement | $ 9 | $ 28 |  |  |
Cash flow hedges(1) | Derivatives | Transaction exposure hedging risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | (205) | 325 |
Gain (loss) transferred out of other comprehensive income to other operating expenses |  |  | 203 | (20) |
Cash flow hedges(1) | Derivatives | Foreign currency debt risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | 94 | 90 |
Gain (loss) transferred out of other comprehensive income to other finance charges |  |  | (152) | (65) |
Cash flow hedges(1) | Derivatives | Commodity price risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | 22 | (107) |
Other comprehensive income (loss) reclassified to operating profit |  |  | (9) | 39 | $ 61
Fair value hedges(1) | Interest rate risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amounts |  |  | 4,044 | 5,038 |
Net investment hedges(1) |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Net investment hedge reserve |  |  | 2,488 | 2,418 |
Net investment hedges(1) | Foreign exchange risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) transferred out of other comprehensive income to other finance charges |  |  | 27 |  |
Net investment hedges(1) | Forecast |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gains (losses) recognised in other comprehensive income excluding exchange differences, fair value measurement, assets |  |  | 12 |  |
Net investment hedges(1) | Derivatives | Foreign exchange risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amounts |  |  | 3,198 | 803 |
Net investment hedges(1) | Borrowings | Foreign exchange risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amounts |  |  | $ 8,109 | $ 12,584 |

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