XML 204 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
Document and Entity Information
 12 Months Ended
Dec. 31, 2018
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2018
Document Fiscal Year Focus 2018
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
Rio Tinto Limited [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 371,216,214