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Equity - Own shares - Narrative (Details) - GBP (£) £ / shares in Units, £ in Millions	1 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended				31 Months Ended
	Jul. 28, 2022	Jun. 30, 2022	Oct. 05, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Feb. 11, 2022	Sep. 30, 2021	Jul. 25, 2019	Jun. 30, 2019
Disclosure of reserves within equity [line items]
Share capital		£ 723			£ 723	£ 741	£ 742
Number of shares authorised to be repurchased (in shares)									233,611,282
Repurchase of shares percentage of market value per share to be paid upon purchase									105.00%
Sale of options					13
Financial liabilities		£ 23,551			£ 23,551	£ 20,445
Par value of shares authorised to be repurchased (in GBP per share)									£ 0.28935
Own shares
Disclosure of reserves within equity [line items]
Number of shares outstanding (in shares)		219,000,000			219,000,000	223,000,000	227,000,000				232,000,000
Share buyback programme
Disclosure of reserves within equity [line items]
Stock repurchase program, authorized amount										£ 4,500
Financial liabilities		£ 117			£ 117
Share buyback programme | Major ordinary share transactions
Disclosure of reserves within equity [line items]
Number of shares purchased - share buyback programme (in shares)	3,300,000
Share buyback programme | Diageo Plc
Disclosure of reserves within equity [line items]
Purchase of own shares					£ 2,284	£ 109	£ 1,282
Number of shares purchased - share buyback programme (in shares)					61,000,000	3,200,000	39,000,000
Purchase of own shares percentage of issued ordinary share capital					2.40%	0.10%	1.50%
Weighted average share price per share (in GBP per share)					£ 37.09	£ 34.07	£ 32.43
Transaction costs					£ 16	£ 1	£ 7
Share buyback programme | Own shares
Disclosure of reserves within equity [line items]
Purchase of own shares		£ 1,400	£ 1,700	£ 900	£ 2,284	£ 109	£ 1,282	£ 2,250
Number of shares purchased - share buyback programme (in shares)					61,000,000	3,000,000	39,000,000
Employee share trusts
Disclosure of reserves within equity [line items]
Number of shares outstanding (in shares)		2,000,000			2,000,000	2,000,000	2,000,000
Share capital		£ 25			£ 25	£ 47	£ 51
Market value of shares outstanding		£ 63			£ 63	£ 74	£ 57

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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