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Finance income and finance costs (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Finance Income Expense Explanatory [Abstract] |
Summary of Finance Income and Finance Cost |
|  |  | 2017 |  |  | 2016 |  |  | 2015 |
| Note | US$m |  | US$m |  | US$m |
Finance income from equity accounted units (Rio Tinto share) |  |  | 4 |  |  | 6 |  |  | 8 |
Other finance income (including bank deposits and other financial assets) |  |  | 137 |  |  | 83 |  |  | 44 |
Total finance income |  |  | 141 |  |  | 89 |  |  | 52 |
Interest on: |  |  |  |  |  |  |  |  |  |
– Financial liabilities at amortised cost and associated derivatives |  |  | (819 | ) |  | (895 | ) |  | (972 | )
– Finance leases |  |  | (3 | ) |  | (3 | ) |  | (4 | )
Fair value movements: |  |  |  |  |  |  |  |  |  |
– Bonds designated as hedged items in fair value hedges |  |  | 28 |  |  | 89 |  |  | (17 | )
– Derivatives designated as hedging instruments in fair value hedges |  |  | (22 | ) |  | (89 | ) |  | (11 | )
Loss on early redemption of bonds (a) |  |  | (256 | ) |  | (324 | ) |  | - |
Amounts capitalised | 14 |  | 224 |  |  | 111 |  |  | 254 |
Total finance costs |  |  | (848 | ) |  | (1,111 | ) |  | (750 | )
(a) | In 2017, loss on early redemption of bonds includes a premium charge of US$238 million; unamortised debt issuance costs and fees of US$14 million and the write-off of the fair value hedge adjustment of US$4 million (see note 30).
In 2016, loss on early redemption of bonds included a premium charge of US$441 million; unamortised debt issuance costs and fees of US$42 million partially offset by the write-off of fair value hedge adjustments of US$159 million (see note 30).

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