Leases - Future cash outflow not reflected in lease liability - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Lease [Abstract]
Future cash outflows not included in lease liabilities in respect of extension and termination options which are not reasonably expected to be exercised	$ 201	$ 211

Potential Exposure To Future Cash Outflow Arising from Extension Options And Termination Options Not Reflected In Measurement Of Lease Liability

No definition available.

Name:	deo_PotentialExposureToFutureCashOutflowArisingfromExtensionOptionsAndTerminationOptionsNotReflectedInMeasurementOfLeaseLiability
Namespace Prefix:	deo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration