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Cover
 12 Months Ended
Jun. 30, 2021
shares
Entity Addresses [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Jun. 30, 2021
Current Fiscal Year End Date --06-30
Document Transition Report false
Document Shell Company Report false
Entity File Number 1-10691
Entity Registrant Name DIAGEO plc
Entity Incorporation, State or Country Code X0
Entity Address, Address Line One Lakeside Drive
Entity Address, Address Line Two Park Royal
Entity Address, City or Town London
Entity Address, Postal Zip Code NW10 7HQ
Entity Address, Country GB
Entity Common Stock, Shares Outstanding 2,558,828,824
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Document Accounting Standard International Financial Reporting Standards
ICFR Auditor Attestation Flag true
Entity Shell Company false
Amendment Flag false
Document Fiscal Year Focus 2021
Document Fiscal Period Focus FY
Entity Central Index Key 0000835403
Business Contact  
Entity Addresses [Line Items]  
Entity Address, Address Line One Lakeside Drive
Entity Address, Address Line Two Park Royal
Entity Address, City or Town London
Entity Address, Postal Zip Code NW10 7HQ
Entity Address, Country GB
Contact Personnel Name Siobhan Moriarty
Country Region 44
City Area Code 20
Local Phone Number 8978 6000
Contact Personnel Email Address the.cosec@diageo.com
American Depositary Shares  
Entity Addresses [Line Items]  
Title of 12(b) Security American Depositary Shares
Trading Symbol DEO
Security Exchange Name NYSE
Ordinary shares  
Entity Addresses [Line Items]  
Title of 12(b) Security Ordinary shares of 28101/108 pence each
Trading Symbol DEO
Security Exchange Name NYSE
2.875% Guaranteed Notes due 2022  
Entity Addresses [Line Items]  
Title of 12(b) Security 2.875% Guaranteed Notes due 2022
Trading Symbol DEO/22
Security Exchange Name NYSE
8.000% Guaranteed Notes due 2022  
Entity Addresses [Line Items]  
Title of 12(b) Security 8.000% Guaranteed Notes due 2022
Trading Symbol DEO/22A
Security Exchange Name NYSE
7.450% Guaranteed Notes due 2035  
Entity Addresses [Line Items]  
Title of 12(b) Security 7.450% Guaranteed Notes due 2035
Trading Symbol DEO/35
Security Exchange Name NYSE
4.250% Guaranteed Notes due 2042  
Entity Addresses [Line Items]  
Title of 12(b) Security 4.250% Guaranteed Notes due 2042
Trading Symbol DEO/42
Security Exchange Name NYSE