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Financial instruments and risk management - Schedule of notional amounts, contractual maturities and rates of hedging instruments designated in hedging relationships by main risk categories (Details) $ in Millions | Jun. 30, 2024 USD ($) $ / bushel uSDollarPerTherm | Jun. 30, 2023 USD ($) USD_per_Metric_Tonnes $ / bushel
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Net investment hedges(1) | Foreign exchange risk | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | $ 3,198 | $ 803
Net investment hedges(1) | Foreign exchange risk | Borrowings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | $ 8,109 | $ 12,584
Net investment hedges(1) | Foreign exchange risk | Sterling | Minimum | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.53 |
Net investment hedges(1) | Foreign exchange risk | Sterling | Minimum | Borrowings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.76 |
Net investment hedges(1) | Foreign exchange risk | Sterling | Maximum | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.78 |
Net investment hedges(1) | Foreign exchange risk | Sterling | Maximum | Borrowings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.82 |
Net investment hedges(1) | Foreign exchange risk | Euro | Minimum | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.91 |
Net investment hedges(1) | Foreign exchange risk | Euro | Minimum | Borrowings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.89 | 1.07
Net investment hedges(1) | Foreign exchange risk | Euro | Maximum | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.93 |
Net investment hedges(1) | Foreign exchange risk | Euro | Maximum | Borrowings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.94 | 1.37
Net investment hedges(1) | Foreign exchange risk | Chinese yuan | Minimum | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 6.93 |
Net investment hedges(1) | Foreign exchange risk | Chinese yuan | Maximum | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 7.29 |
Net investment hedges(1) | Foreign exchange risk | US dollar | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 1.27
Cash flow hedges(1) | Foreign currency debt risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | $ 2,747 | $ 1,100
Cash flow hedges(1) | Foreign currency debt risk | Euro | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.89 |
Cash flow hedges(1) | Foreign currency debt risk | Euro | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.90 |
Cash flow hedges(1) | Foreign currency debt risk | US dollar | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 1.60
Cash flow hedges(1) | Foreign currency debt risk | US dollar | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 1.88
Cash flow hedges(1) | Foreign currency exchange risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | $ 1,855 | $ 2,185
Cash flow hedges(1) | Foreign currency exchange risk | Sterling | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.78 |
Cash flow hedges(1) | Foreign currency exchange risk | Sterling | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.94 |
Cash flow hedges(1) | Foreign currency exchange risk | Euro | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.87 |
Cash flow hedges(1) | Foreign currency exchange risk | Euro | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.93 |
Cash flow hedges(1) | Foreign currency exchange risk | Mexican peso | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 17.73 | 14.76
Cash flow hedges(1) | Foreign currency exchange risk | Mexican peso | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 20.57 | 18.38
Cash flow hedges(1) | Foreign currency exchange risk | US dollar | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 1.05
Cash flow hedges(1) | Foreign currency exchange risk | US dollar | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 1.33
Cash flow hedges(1) | Commodity price risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | $ 207 | $ 273
Cash flow hedges(1) | Commodity price risk | Minimum | Feed Wheat |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | $ / bushel | 177.50 | 183.75
Cash flow hedges(1) | Commodity price risk | Minimum | Natural Gas |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | uSDollarPerTherm | 0.86 |
Cash flow hedges(1) | Commodity price risk | Minimum | Aluminium |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | USD_per_Metric_Tonnes |  | 2,248
Cash flow hedges(1) | Commodity price risk | Maximum | Feed Wheat |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | $ / bushel | 206.00 | 240.00
Cash flow hedges(1) | Commodity price risk | Maximum | Natural Gas |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | uSDollarPerTherm | 1.40 |
Cash flow hedges(1) | Commodity price risk | Maximum | Aluminium |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | USD_per_Metric_Tonnes |  | 3,399
Fair value hedges(1) | Interest rate risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | $ 4,044 | $ 5,038
Fair value hedges(1) | Interest rate risk | Minimum | Euro Interbank Offered Rate (EURIBOR) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.0063 | (0.0001)
Fair value hedges(1) | Interest rate risk | Minimum | Secured Overnight Financing Rate (SOFR) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.0138 | 0.0238
Fair value hedges(1) | Interest rate risk | Minimum | US Dollars LIBOR (USDLIBOR) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 0.0138
Fair value hedges(1) | Interest rate risk | Maximum | Euro Interbank Offered Rate (EURIBOR) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.0188 | 0.0188
Fair value hedges(1) | Interest rate risk | Maximum | Secured Overnight Financing Rate (SOFR) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.0309 | 0.0239
Fair value hedges(1) | Interest rate risk | Maximum | US Dollars LIBOR (USDLIBOR) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 0.0309

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