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Share-based payments - Summary of options outstanding and exercisable (Parenthetical) (Detail) - Dec. 31, 2018 - Share Option Plan [member] $ in Millions	AUD ($)	GBP (£)
Rio Tinto plc [member] | Bottom of range [Member] | Ranges Of Exercise Prices For Outstanding Share Options Three
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]
Options outstanding, exercise price		£ 16
Rio Tinto plc [member] | Top of range [Member] | Ranges Of Exercise Prices For Outstanding Share Options Three
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]
Options outstanding, exercise price		£ 25
Rio Tinto Limited [member] | Ranges Of Exercise Prices For Outstanding Share Options Four
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]
Options outstanding, exercise price | $	$ 33

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- Definition

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+ References

No definition available.

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- Definition

The exercise price of outstanding share options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph d
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-URIDate 2017-03-09

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