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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
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