XML 412 R25.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Inventories | 12 Months Ended
--- | ---
Dec. 31, 2019
Disclosure Of Inventories [Abstract] |
Inventories | 16 Inventories
| 2019 US$m |  | 2018 US$m |
Raw materials and purchased components | 675 |  | 734 |
Consumable stores | 925 |  | 862 |
Work in progress | 1,066 |  | 1,026 |
Finished goods and goods for resale | 936 |  | 977 |
Total inventories | 3,602 |  | 3,599 |
Comprising: |  |
Expected to be used within one year | 3,463 |  | 3,447 |
Expected to be used after more than one year | 139 |  | 152 |
Total inventories | 3,602 |  | 3,599 |
During 2019, the Group recognised a net inventory write-downs of US$42 million. This comprised inventory write-offs of US$134 million partly offset by write-back of previously written down inventory due to an increase in realisable values amounting to US$92 million. In 2018, the Group recognised inventory write-downs, net of reversals, amounting to US$48 million. At 31 December 2019, US$611 million (2018: US$566 million) of inventories were pledged as security for liabilities.

X
- Definition The entire disclosure for inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2019-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IAS02_g36-39_TI -URIDate 2019-03-27 + Details
Name: | ifrs-full_DisclosureOfInventoriesExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure Of Inventories [Abstract] + References No definition available. + Details
Name: | rio_DisclosureOfInventoriesAbstract
Namespace Prefix: | rio_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration