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Cover
 12 Months Ended
Dec. 31, 2019
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Trading Symbol RIO
Entity Registrant Name Rio Tinto plc
Entity Central Index Key 0000863064
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 1,287,659,651
Document Annual Report true
Document Transition Report false
Entity Shell Company false
Entity Emerging Growth Company false
Entity Interactive Data Current Yes
Rio Tinto Limited [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 371,216,214