XML 179 R172.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Capitalised finance leases - Summary of capitalised finance leases (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items] |  |
Total minimum lease payments undiscounted | $ 57 | $ 45
Effect of discounting | (4) |
Total minimum lease payments discounted | 53 | 45
Due within 1 year [member] |  |
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items] |  |
Present value of minimum lease payments | 4 | 21
Between 1 and 3 years [member] |  |
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items] |  |
Present value of minimum lease payments | 14 | 8
Between 3 and 5 years [member] |  |
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items] |  |
Present value of minimum lease payments | 28 | 6
More than 5 years [member] |  |
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items] |  |
Present value of minimum lease payments | $ 11 | $ 10

X
- Definition The amount of the discounted unguaranteed residual value of assets subject to finance leases. Unguaranteed residual value is the portion of the residual value of the underlying asset, the realisation of which by a lessor is not assured or is guaranteed solely by a party related to the lessor. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2016-01-13 -Paragraph 94 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2016-03-30&anchor=para_94&doctype=Standard -URIDate 2016-03-31 + Details
Name: | ifrs-full_DiscountedUnguaranteedResidualValueOfAssetsSubjectToFinanceLease
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to finance lease obligations before deducting finance charges. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2019-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph B11D -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_B11D_a&doctype=Appendix&seq=2 -URIDate 2016-03-31 + Details
Name: | ifrs-full_GrossFinanceLeaseObligations
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of payments over the finance lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2016-01-13 -Paragraph 31 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2016-03-30&anchor=para_31_b&doctype=Standard -URIDate 2016-03-31 + Details
Name: | ifrs-full_MinimumFinanceLeasePaymentsPayable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The present value of minimum finance lease payments payable. [Refer: Minimum finance lease payments payable] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2016-01-13 -Paragraph 31 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2016-03-30&anchor=para_31_b&doctype=Standard -URIDate 2016-03-31 + Details
Name: | ifrs-full_MinimumFinanceLeasePaymentsPayableAtPresentValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items] + References No definition available. + Details
Name: | rio_DisclosureOfMaturityAnalysisOfFinanceLeasePaymentsPayableLineItems
Namespace Prefix: | rio_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |