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Consolidated net debt | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Consolidated Net Debt [Abstract] |
Consolidated net debt | 24 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 | )
|  |  |  |  |  | 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 | )
(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.
Further information relating to the currency and interest rate exposures arising from net debt and related derivatives is given in note 30.

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