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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, 2022 GBP (£) USD_per_Metric_Tonnes poundSterlingPerTherm | Jun. 30, 2021 GBP (£) $ / bushel USD_per_Metric_Tonnes
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Net investment hedges | Turkish lira | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 11.86
Net investment hedges | Turkish lira | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 12.22
Net investment hedges | Foreign exchange risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 11 | £ 11
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 | £ 1,694 | £ 1,475
Cash flow hedges | Foreign currency debt risk | US dollar | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.22 | 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 | £ 1,874 | £ 1,303
Cash flow hedges | Foreign currency exchange risk | US dollar | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.22 | 1.19
Cash flow hedges | Foreign currency exchange risk | US dollar | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.42 | 1.42
Cash flow hedges | Foreign currency exchange risk | Euro | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.13 | 1.07
Cash flow hedges | Foreign currency exchange risk | Euro | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.17 | 1.16
Cash flow hedges | Commodity price risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 234 | £ 93
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 | 2,009 | 1,631
Cash flow hedges | Commodity price risk | Minimum | Corn |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | $ / bushel |  | 3.63
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 | 2,421
Cash flow hedges | Commodity price risk | Maximum | Corn |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | $ / bushel |  | 5.17
Fair value hedges | Interest rate risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 4,444 | £ 4,646
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

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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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