XML 17 R9.htm IDEA: XBRL DOCUMENT
v3.20.2

Group balance sheet (Parenthetical) shares in Millions | 6 Months Ended
--- | ---
Jun. 30, 2020 shares
Rio Tinto Plc |
Statements [Line Items] |
Weighted average number of ordinary shares outstanding (in shares) | 1,246.7
Rio Tinto Limited |
Statements [Line Items] |
Weighted average number of ordinary shares outstanding (in shares) | 371.2

X
- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_b&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_WeightedAverageShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Statements line items. + References No definition available. + Details
Name: | rio_StatementsLineItems
Namespace Prefix: | rio_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=rio_RioTintoPlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=rio_RioTintoLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |