XML 236 R33.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Consolidated net cash/(debt) | 12 Months Ended
--- | ---
Dec. 31, 2018
Disclosure Of Consolidated Net Debt [Abstract] |
Consolidated net cash/(debt) | 24 Consolidated net cash/(debt)
|  | Financing liabilities (b) |  | Other assets |  |  |  |
|  | Borrowings (including finance leases) excluding |  | Debt-related derivatives (included in Other financial assets/ |  | Cash/ |  | Other |  | Net |
|  | overdrafts (a) |  | liabilities) |  | overdrafts (b) |  | investments (c) |  | (debt)/cash |
Year ended 31 December 2018 |  | US$m |  | US$m |  | US$m |  | US$m |  | US$m |
Analysis of changes in consolidated net cash/(debt) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  | (15,173 | ) |  | (177 | ) |  | 10,547 |  |  | 958 |  |  | (3,845 | )
Foreign exchange adjustment |  |  | 126 |  |  | (64 | ) |  | 151 |  |  | - |  |  | 213 |
Cash movements excluding exchange movements |  |  | 2,246 |  |  | 51 |  |  | 191 |  |  | 1,557 |  |  | 4,045 |
Other non-cash movements |  |  | 50 |  |  | (98 | ) |  | (117 | ) |  | 7 |  |  | (158 | )
Closing balance |  |  | (12,751 | ) |  | (288 | ) |  | 10,772 |  |  | 2,522 |  |  | 255 |
|  | Financing liabilities (b) |  | Other assets |  |  |  |
|  | Borrowings (including finance leases) excluding |  | Debt-related derivatives (included in Other financial assets/ |  | Cash/ |  | Other |  | Net |
|  | overdrafts (a) |  | liabilities) |  | overdrafts (b) |  | investments (c) |  | debt |
Year ended 31 December 2017 |  | US$m |  | US$m |  | US$m |  | US$m |  | US$m |
Analysis of changes in consolidated net debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  | (17,618 | ) |  | (408 | ) |  | 8,189 |  |  | 250 |  |  | (9,587 | )
Foreign exchange adjustment |  |  | (303 | ) |  | 245 |  |  | (12 | ) |  | - |  |  | (70 | )
Cash movements excluding exchange movements |  |  | 2,777 |  |  | 7 |  |  | 2,370 |  |  | 705 |  |  | 5,859 |
Other non-cash movements |  |  | (29 | ) |  | (21 | ) |  | - |  |  | 3 |  |  | (47 | )
Closing balance |  |  | (15,173 | ) |  | (177 | ) |  | 10,547 |  |  | 958 |  |  | (3,845 | )
(a) | Borrowings (including finance leases) at 31 December 2018 differ from total borrowings on the balance sheet as they exclude overdrafts of US$1 million (31 December 2017: US$3 million), other current financial liabilities of US$761 million (31 December 2017: US$352 million) and other non-current financial liabilities US$407 million (31 December 2017: US$524 million).
(b) | Closing cash/overdrafts at 31 December 2018 differ from cash and cash equivalents on the balance sheet as they include overdrafts of US$1 million which have been classified as a financial liability (31 December 2017: US$3 million). Other non-cash movements represents the reclassification of cash and cash equivalents in disposal groups to assets held for sale.
(c) | Other investments comprise US$2,522 million (2017: US$958 million) of highly liquid financial assets held in managed investment funds classified as held for trading.
Further information relating to the currency and interest rate exposures arising from net debt and related derivatives is given in note 30.

X
- Definition Disclosure of consolidated net debt. + References No definition available. + Details
Name: | rio_DisclosureOfConsolidatedNetDebtAbstract
Namespace Prefix: | rio_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure of consolidated net debt. + References No definition available. + Details
Name: | rio_DisclosureOfConsolidatedNetDebtExplanatory
Namespace Prefix: | rio_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration