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Financial instruments and risk management - Foreign exchange risk - Additional information (Detail)	12 Months Ended
	Dec. 31, 2020
Foreign exchange risk
Disclosure of detailed information about financial instruments [line items]
Percentage of change in annual foreign exchange rate	10.00%

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of change in annual foreign exchange rate.

+ References

No definition available.

+ Details

Name:	rio_PercentageOfChangeInAnnualForeignExchangeRate
Namespace Prefix:	rio_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: