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Consolidated net debt (Tables) | 6 Months Ended
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Jun. 30, 2018
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 | Cash/ | Other |  | 30 June 2018 |  | 31 December 2017
|  | overdraft | Other financial | Overdraft | investments |  | Net debt |  | Net debt
|  | (a) | assets/liabilities) | (b) | (c) |  | US$m |  | US$m
Analysis of changes in consolidated net debt |  |  |  |  |  |  |  |  |
Opening balance |  | (15,173) | (177) | 10,547 | 958 |  | (3,845) |  | (9,587)
Foreign exchange adjustment |  | 73 | (33) | (20) | - |  | 20 |  | (70)
Cash movements excluding exchange movements |  | 2,074 | 51 | (4,533) | 1,047 |  | (1,361) |  | 5,859
Other non-cash movements |  | 113 | (151) | (5) | - |  | (43) |  | (47)
Closing balance |  | (12,913) | (310) | 5,989 | 2,005 |  | (5,229) |  | (3,845)
(a) | Borrowings (including finance leases) at 30 June 2018 differ from total borrowings and other financial liabilities of US$13,726 million (31 December 2017: US$16,052 million) on the balance sheet as they exclude overdrafts of US$nil million (31 December 2017: US$3 million), other current financial liabilities of US$282 million (31 December 2017: US$352 million) and other non-current financial liabilities US$531 million (31 December 2017: US$524 million).
(b) | The opening balance at 1 January 2018 included bank overdrafts of US$3 million which are classified as financial liabilities on the balance sheet. At 30 June 2018 there were no overdrafts. 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$2.0 billion (31 December 2017: US$958 million) of highly liquid financial assets held in managed investment funds classified as held at fair value through profit or loss.

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