Assets and liabilities held for sale - Narrative (Details) $ in Millions	6 Months Ended
Dec. 31, 2025 USD ($)
EABL and Kenyan spirits business prospective sale [Member]
Disclosure Of Assets and Liabilities Held For Sale [Line Items]
Disposal, exchange loss that will be recycled to the income statement	$ 79

Disposal, Exchange Gain (Loss) Expected To Be Recycled To The Income Statement On Translation Of Foreign Operation

No definition available.

Name:	deo_DisposalExchangeGainLossExpectedToBeRecycledToTheIncomeStatementOnTranslationOfForeignOperation
Namespace Prefix:	deo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration