XML 694 R203.htm IDEA: XBRL DOCUMENT v3.22.0.1

Post-retirement benefits - Summary of geographical distribution of defined benefit obligations (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	100.00%	100.00%	100.00%
Canada
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	55.00%	53.00%	53.00%
UK
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	28.00%	28.00%	28.00%
US
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	10.00%	10.00%	10.00%
Switzerland
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	5.00%	5.00%	5.00%
Other countries
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	2.00%	4.00%	4.00%
Pension benefits
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	100.00%
Pension benefits | Canada
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	56.00%
Pension benefits | UK
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	29.00%
Pension benefits | US
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	8.00%
Pension benefits | Switzerland
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	5.00%
Pension benefits | Other countries
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	2.00%
Other benefits
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	100.00%
Other benefits | Canada
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	48.00%
Other benefits | UK
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	2.00%
Other benefits | US
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	47.00%
Other benefits | Switzerland
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	0.00%
Other benefits | Other countries
Disclosure of defined benefit plans [Line Items]
Defined benefit obligation	3.00%

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Defined benefit obligation maturity percentage.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_CH
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=rio_OtherCountriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis=ifrs-full_PensionDefinedBenefitPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis=ifrs-full_PostemploymentMedicalDefinedBenefitPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: