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Equity - Own shares - Narrative (Details) - GBP (£) £ / shares in Units, £ in Millions	1 Months Ended	6 Months Ended	12 Months Ended			14 Months Ended	35 Months Ended
	Jul. 29, 2021	Jan. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2022	Jun. 30, 2022	Sep. 28, 2020	Jul. 25, 2019	Jun. 30, 2018
Disclosure of reserves within equity [line items]
Share capital			£ 741	£ 742	£ 753
Number of shares authorised to be repurchased (in shares)								232,820,888
Repurchase of shares percentage of market value per share to be paid upon purchase								105.00%
Financial liabilities			£ 20,445	£ 21,425
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)			223,000,000	227,000,000	232,000,000					238,000,000
Share buyback programme
Disclosure of reserves within equity [line items]
Stock repurchase program, authorized amount									£ 4,500
Financial liabilities			£ 91
Share buyback programme | Major ordinary share transactions
Disclosure of reserves within equity [line items]
Number of shares purchased - share buyback programme (in shares)	2,600,000
Share buyback programme | Diageo Plc
Disclosure of reserves within equity [line items]
Purchase of own shares			£ 109	£ 1,282	£ 2,775
Number of shares purchased - share buyback programme (in shares)			3,200,000	39,000,000	94,700,000
Purchase of own shares percentage of issued ordinary share capital			0.10%	1.50%	3.50%
Weighted average share price per share (in GBP per share)			£ 34.07	£ 32.43	£ 29.24
Transaction costs			£ 1	£ 7	£ 6
Share buyback programme | Own shares
Disclosure of reserves within equity [line items]
Purchase of own shares		£ 1,250	£ 109	£ 1,282	£ 2,775	£ 1,000
Number of shares purchased - share buyback programme (in shares)			3,000,000	39,000,000	95,000,000
Return of capital programme
Disclosure of reserves within equity [line items]
Term of share buy-back program							3 years
Extension of term of share buy-back programme							2 years
Purchased call options
Disclosure of reserves within equity [line items]
Number of call options purchased (in shares)					4,000,000
Purchase of call options					£ 14
Term of call options					3 years
Employee share trusts
Disclosure of reserves within equity [line items]
Number of shares outstanding (in shares)			2,000,000	2,000,000	3,000,000
Share capital			£ 47	£ 51	£ 58
Market value of shares outstanding			£ 74	£ 57	£ 92

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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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