XML 470 R267.htm IDEA: XBRL DOCUMENT
v3.10.0.1

New Standards and Interpretations Adopted in the Current Year - Summary of financial assets classified into appropriate IFRS 9 categories (Parenthetical) (Detail) $ in Billions | Jan. 01, 2018 USD ($)
--- | ---
Disclosure Of Initial Application Of Standards Or Interpretations [Abstract] |
Money market funds | $ 7.8
Reclassification of trade and other receivables from amortised cost to FVPL | $ 1.3

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Money market funds. + References No definition available. + Details
Name: | rio_MoneyMarketFunds
Namespace Prefix: | rio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reclassification of trade and other receivables from amortised cost to FVPL. + References No definition available. + Details
Name: | rio_ReclassificationOfTradeAndOtherReceivablesFromAmortisedCostToFVPL
Namespace Prefix: | rio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant