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Cover
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2020
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-10533
Entity Registrant Name Rio Tinto plc
Entity Incorporation, State or Country Code X0
Entity Address, Address Line One 6 St. James's Square
Entity Address, City or Town London
Entity Address, Postal Zip Code SW1Y 4AD
Entity Address, Country GB
Title of 12(b) Security American Depositary Shares
Trading Symbol RIO
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 1,255,756,296
Entity Well-known Seasoned Issuer Yes
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
ICFR Auditor Attestation Flag true
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Amendment Flag false
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Entity Central Index Key 0000863064
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 6 St. James's Square
Entity Address, City or Town London
Entity Address, Postal Zip Code SW1Y 4AD
Entity Address, Country GB
Contact Personnel Name Julie Parent
City Area Code 514
Local Phone Number 848-8519
Contact Personnel Email Address julie.parent@riotinto.com
Rio Tinto Limited  
Document Information [Line Items]  
Entity File Number 001-34121
Entity Registrant Name Rio Tinto Limited
Entity Incorporation, State or Country Code C3
Entity Address, Address Line One Level 7, 360 Collins Street
Entity Address, City or Town Melbourne
Entity Address, Postal Zip Code 3000
Entity Address, Country AU
Entity Common Stock, Shares Outstanding 371,216,214