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Consolidated net debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Consolidated Net Debt [Abstract] |
Analysis of changes in consolidated net debt |
|  | Financing liabilities (b) |  | Other assets |  |  |  |  |  |  |
|  | Borrowings (including finance leases) excluding |  | Debt-related derivatives (included in Other financial assets/ |  | Cash/ |  | Other |  |  | 2017 |  |  | 2016 |
|  | Overdrafts (a) |  | liabilities) |  | Overdrafts (b) |  | investments (c) |  | Net debt |  | Net debt |
Year ended 31 December |  |  |  |  |  |  |  |  |  |  |  |  |  | US$m |  | US$m |
Analysis of changes in consolidated net debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  | (17,618 | ) |  | (408 | ) |  | 8,189 |  |  | 250 |  |  | (9,587 | ) |  | (13,783 | )
Foreign exchange adjustment |  |  | (303 | ) |  | 245 |  |  | (12 | ) |  | - |  |  | (70 | ) |  | 90 |
Cash movements excluding exchange movements |  |  | 2,777 |  |  | 7 |  |  | 2,370 |  |  | 705 |  |  | 5,859 |  |  | 3,915 |
Other non-cash movements |  |  | (29 | ) |  | (21 | ) |  | - |  |  | 3 |  |  | (47 | ) |  | 191 |
Closing balance |  |  | (15,173 | ) |  | (177 | ) |  | 10,547 |  |  | 958 |  |  | (3,845 | ) |  | (9,587 | )
(a) | Borrowings (including finance leases) at 31 December 2017 differ from total borrowings on the balance sheet as they exclude overdrafts of US$3 million (31 December 2016: US$12 million), other current financial liabilities of US$352 million (31 December 2016: US$205 million) and other non-current financial liabilities US$524 million (31 December 2016: US$557 million).
(b) | Closing cash/overdrafts at 31 December 2017 differ from cash and cash equivalents on the balance sheet as they include overdrafts of US$3 million which have been classified as a financial liability (31 December 2016: US$12 million).
(c) | Other investments comprise US$958 million (2016: US$250 million) of highly liquid financial assets held in managed investment funds classified as held for trading.
Exchange gains/(losses) on US dollar net debt and intragroup balances |
|  |  |  |  |  | 2017 |  |  | 2016 |  |  | 2015 |
|  |  |  |  | US$m |  | US$m |  | US$m |
Exchange gains/(losses) on US dollar net debt and intragroup balances |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange gains/(losses) on US dollar net debt |  |  |  |  |  | 554 |  |  | 160 |  |  | (1,578 | )
Exchange (losses)/gains on intragroup balances |  |  |  |  |  | (1,154 | ) |  | 449 |  |  | (1,961 | )
Exchange (losses)/gains on settlement of dividends |  |  |  |  |  | (1 | ) |  | 2 |  |  | 1 |
(Charged)/credited to income statement |  |  |  |  |  | (601 | ) |  | 611 |  |  | (3,538 | )

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