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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, 2023
GBP (£)
$ / bushel
USD_per_Metric_Tonnes
Jun. 30, 2022
GBP (£)
poundSterlingPerTherm
USD_per_Metric_Tonnes
Net investment hedges | Foreign exchange risk    
Disclosure of detailed information about financial instruments [line items]    
Notional amounts £ 637 £ 11
Net investment hedges | Foreign exchange risk | US dollar    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates 1.27  
Net investment hedges | Foreign exchange risk | Turkish lira    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates   22.27
Cash flow hedges | Foreign currency debt risk    
Disclosure of detailed information about financial instruments [line items]    
Notional amounts £ 873 £ 1,694
Cash flow hedges | Foreign currency debt risk | US dollar | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates 1.60 1.22
Cash flow hedges | Foreign currency debt risk | US dollar | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates 1.88 1.88
Cash flow hedges | Foreign currency exchange risk    
Disclosure of detailed information about financial instruments [line items]    
Notional amounts £ 1,734 £ 1,874
Cash flow hedges | Foreign currency exchange risk | US dollar | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates 1.05 1.22
Cash flow hedges | Foreign currency exchange risk | US dollar | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates 1.33 1.42
Cash flow hedges | Foreign currency exchange risk | Mexican peso | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates 14.76  
Cash flow hedges | Foreign currency exchange risk | Mexican peso | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates 18.38  
Cash flow hedges | Foreign currency exchange risk | Euro | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates   1.13
Cash flow hedges | Foreign currency exchange risk | Euro | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates   1.17
Cash flow hedges | Commodity price risk    
Disclosure of detailed information about financial instruments [line items]    
Notional amounts £ 217 £ 234
Cash flow hedges | Commodity price risk | Minimum | Natural Gas    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates | poundSterlingPerTherm   1.67
Cash flow hedges | Commodity price risk | Minimum | Aluminium    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates | USD_per_Metric_Tonnes 2,248 2,009
Cash flow hedges | Commodity price risk | Minimum | Feed Wheat    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates | $ / bushel 183.75  
Cash flow hedges | Commodity price risk | Maximum | Natural Gas    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates | poundSterlingPerTherm   3.57
Cash flow hedges | Commodity price risk | Maximum | Aluminium    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates | USD_per_Metric_Tonnes 3,399 3,399
Cash flow hedges | Commodity price risk | Maximum | Feed Wheat    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates | $ / bushel 240.00  
Fair value hedges | Interest rate risk    
Disclosure of detailed information about financial instruments [line items]    
Notional amounts £ 3,999 £ 4,444
Fair value hedges | Interest rate risk | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates (0.0001) (0.0001)
Fair value hedges | Interest rate risk | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Range of hedged rates 0.0309 0.0309