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Financial instruments and risk management - Additional information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Financial Instruments [Abstract] |  |
Description of exposure to risk | Rio Tinto’s policies on financial risk management are defined such that the Group has a capital structure in place to manage the organisation through the commodity cycle and that Group’s exposures may float with the market. Any exceptions to this general principle are formally approved. The Group is exposed to capital, liquidity, commodity price, credit, foreign exchange and interest rate risk. |
Transfers between Level 1 and Level 2 | $ 0 | $ 0
Transfers between Level 2 and Level 3 | $ 0 | $ 0

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- Definition The description of exposures to risks arising from financial instruments. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 33 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_33_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_c&doctype=Standard -URIDate 2017-03-09 + Details
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