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Other reserves and retained earnings (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Other Reserves And Retained Earnings [Abstract] |
Summary of other reserves and retained earnings |
|  | 2018 |  |  | 2017 |  |  | 2016 |
| US$m |  | US$m |  | US$m |
Capital redemption reserve (a) |  |  |  |  |  |  |  |  |
At 1 January |  | 38 |  |  | 34 |  |  | 34 |
Own shares purchased and cancelled |  | 9 |  |  | 4 |  |  | - |
At 31 December |  | 47 |  |  | 38 |  |  | 34 |
Cash flow hedge reserve |  |  |  |  |  |  |  |  |
At 1 January |  | 32 |  |  | 32 |  |  | - |
Adjustment for transition to new accounting standards (note 45) |  | (4 | ) |  | - |  |  | - |
Cash flow hedge gains/(losses) |  | 156 |  |  | 62 |  |  | (88 | )
Cash flow hedge losses/(gains) transferred to the income statement |  | 40 |  |  | (62 | ) |  | 116 |
Tax on the above |  | (54 | ) |  | - |  |  | 4 |
Transfers and other movements |  | 25 |  |  | - |  |  | - |
At 31 December |  | 195 |  |  | 32 |  |  | 32 |
Available for sale revaluation reserves |  |  |  |  |  |  |  |  |
At 1 January |  | 20 |  |  | (126 | ) |  | (139 | )
Adjustment for transition to new accounting standards (note 45) |  | (20 | ) |  | - |  |  | - |
Gains on available for sale securities |  | - |  |  | 19 |  |  | 13 |
Losses on available for sale securities transferred to the income statement |  | - |  |  | 6 |  |  | - |
Tax on the above |  | - |  |  | (1 | ) |  | - |
Transfers and other movements |  | - |  |  | 122 |  |  | - |
At 31 December |  | - |  |  | 20 |  |  | (126 | )
Fair value through other comprehensive income reserve |  |  |  |  |  |  |  |  |
At 1 January |  | - |  |  | - |  |  | - |
Adjustment for transition to new accounting standards (note 45) |  | 8 |  |  | - |  |  | - |
Losses on equity investments |  | (11 | ) |  | - |  |  | - |
Transfers to retained earnings |  | (3 | ) |  | - |  |  | - |
At 31 December |  | (6 | ) |  | - |  |  | - |
Cost of hedging reserve |  |  |  |  |  |  |  |  |
At 1 January |  | - |  |  | - |  |  | - |
Adjustment for transition to new accounting standards (note 45) |  | 26 |  |  |  |  |  |  |
Cost of hedging deferred to reserves during the year |  | (36 | ) |  |  |  |  |  |
Transfer of cost of hedging to the income statement |  | (3 | ) |  | - |  |  | - |
At 31 December |  | (13 | ) |  | - |  |  | - |
Other reserves (b) |  |  |  |  |  |  |  |  |
At 1 January |  | 11,714 |  |  | 11,861 |  |  | 11,735 |
Change in equity interest held by Rio Tinto |  | - |  |  | - |  |  | 108 |
Own shares purchased from Rio Tinto Limited shareholders to satisfy share options |  | (114 | ) |  | (64 | ) |  | (43 | )
Employee share options: value of services |  | 52 |  |  | 31 |  |  | 58 |
Deferred tax on share options |  | (2 | ) |  | 10 |  |  | 3 |
Companies no longer consolidated |  | - |  |  | (124 | ) |  | - |
At 31 December |  | 11,650 |  |  | 11,714 |  |  | 11,861 |
Foreign currency translation reserve (c) |  |  |  |  |  |  |  |  |
At 1 January |  | 480 |  |  | (2,585 | ) |  | (2,491 | )
Parent and subsidiaries currency translation and exchange adjustments |  | (3,658 | ) |  | 2,942 |  |  | (204 | )
Equity accounted units currency translation adjustments |  | (48 | ) |  | 34 |  |  | 11 |
Currency translation reclassified on disposal |  | 14 |  |  | 78 |  |  | 99 |
Transfers and other movements |  | - |  |  | 11 |  |  | - |
At 31 December |  | (3,212 | ) |  | 480 |  |  | (2,585 | )
Total other reserves per balance sheet |  | 8,661 |  |  | 12,284 |  |  | 9,216 |
|  | 2018 |  |  | 2017 |  |  | 2016 |
| US$m |  | US$m |  | US$m |
Retained earnings (d) |  |  |  |  |  |  |  |  |
At 1 January |  | 23,761 |  |  | 21,631 |  |  | 19,736 |
Adjustment for transition to new accounting standards (note 45) |  | (179 | ) |  | - |  |  | - |
Parent and subsidiaries' profit for the year |  | 13,125 |  |  | 8,423 |  |  | 4,298 |
Equity accounted units' profit after tax for the year |  | 513 |  |  | 339 |  |  | 319 |
Actuarial gains/(losses) (e) |  | 894 |  |  | 1 |  |  | (94 | )
Tax relating to components of other comprehensive income |  | (269 | ) |  | (150 | ) |  | 30 |
Total comprehensive income for the year |  | 14,263 |  |  | 8,613 |  |  | 4,553 |
Share buy-back programme |  | (5,423 | ) |  | (2,312 | ) |  | - |
Dividends paid |  | (5,356 | ) |  | (4,250 | ) |  | (2,725 | )
Change in equity interest held by Rio Tinto |  | 60 |  |  | 43 |  |  | 40 |
Companies no longer consolidated |  | - |  |  | 130 |  |  | - |
Own shares purchased/treasury shares reissued for share options and other movements |  | (140 | ) |  | (18 | ) |  | (37 | )
Employee share options and other IFRS 2 charges taken to the income statement |  | 61 |  |  | 57 |  |  | 64 |
Transfer from FVOCI reserve |  | 3 |  |  | - |  |  | - |
Transfers and other movements |  | (25 | ) |  | (133 | ) |  | - |
At 31 December |  | 27,025 |  |  | 23,761 |  |  | 21,631 |
(a) | The capital redemption reserve was set up to comply with section 733 of the UK Companies Act 2006 (previously section 170 of the UK Companies Act 1985) when shares of a company are redeemed or purchased wholly out of the company’s profits. Balances reflect the amount by which the company’s issued share capital is diminished in accordance with this section.
(b) | Other reserves includes US$11,936 million which represents the difference between the nominal value and issue price of the shares issued arising from Rio Tinto plc’s rights issue completed in July 2009. No share premium was recorded in the Rio Tinto plc financial statements through the operation of the merger relief provisions of the UK Companies Act 1985.
Other reserves also include the cumulative amount recognised under IFRS 2 in respect of options granted but not exercised to acquire shares in Rio Tinto Limited, less, where applicable, the cost of shares purchased to satisfy share options exercised. The cumulative amount recognised under IFRS 2 in respect of options granted but not exercised to acquire shares in Rio Tinto plc is recorded in retained earnings.
(c) | Exchange differences arising on the translation of the Group’s net investment in foreign controlled companies are taken to the foreign currency translation reserve, as described in note 1(d). The cumulative differences relating to an investment are transferred to the income statement when the investment is disposed of.
(d) | Retained earnings and movements in reserves of subsidiaries include those arising from the Group’s share of joint operations.
(e) | There were no actuarial losses relating to equity accounted units in 2018, 2017 or 2016.

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