Financial instruments and risk management - Schedule of financial assets and liabilities measured at fair value (Details) - GBP (£) £ in Millions	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Valuation techniques based on observable market input (Level 2)
Disclosure of detailed information about financial instruments [line items]
Derivative assets	£ 594	£ 480
Derivative liabilities	(440)	(456)
Financial assets/(liabilities) at fair value	154	24
Valuation techniques based on unobservable market input (Level 3)
Disclosure of detailed information about financial instruments [line items]
Financial assets/(liabilities) at fair value	(337)	(403)
Financial assets - other	192	184
Financial liabilities - other	(529)	(587)
Valuation techniques based on unobservable market input (Level 3) \| Contingent consideration payable
Disclosure of detailed information about financial instruments [line items]
Financial liabilities - other	£ (311)	£ (371)	£ (429)

Financial assets liabilities at fair value.

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- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

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- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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The amount of financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

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- Definition

The amount of financial liabilities that the entity does not separately disclose in the same statement or note. [Refer: Financial liabilities]

+ References

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