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Consolidated net cash/(debt) (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Consolidated Net Debt [Abstract] |
Analysis of changes in consolidated net cash/(debt) |
|  | Financing liabilities (b) |  | Other assets |  |  |  |
|  | Borrowings (including finance leases) excluding |  | Debt-related derivatives (included in Other financial assets/ |  | Cash/ |  | Other |  | Net |
|  | overdrafts (a) |  | liabilities) |  | overdrafts (b) |  | investments (c) |  | (debt)/cash |
Year ended 31 December 2018 |  | US$m |  | US$m |  | US$m |  | US$m |  | US$m |
Analysis of changes in consolidated net cash/(debt) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  | (15,173 | ) |  | (177 | ) |  | 10,547 |  |  | 958 |  |  | (3,845 | )
Foreign exchange adjustment |  |  | 126 |  |  | (64 | ) |  | 151 |  |  | - |  |  | 213 |
Cash movements excluding exchange movements |  |  | 2,246 |  |  | 51 |  |  | 191 |  |  | 1,557 |  |  | 4,045 |
Other non-cash movements |  |  | 50 |  |  | (98 | ) |  | (117 | ) |  | 7 |  |  | (158 | )
Closing balance |  |  | (12,751 | ) |  | (288 | ) |  | 10,772 |  |  | 2,522 |  |  | 255 |
|  | Financing liabilities (b) |  | Other assets |  |  |  |
|  | Borrowings (including finance leases) excluding |  | Debt-related derivatives (included in Other financial assets/ |  | Cash/ |  | Other |  | Net |
|  | overdrafts (a) |  | liabilities) |  | overdrafts (b) |  | investments (c) |  | debt |
Year ended 31 December 2017 |  | US$m |  | US$m |  | US$m |  | US$m |  | US$m |
Analysis of changes in consolidated net debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  | (17,618 | ) |  | (408 | ) |  | 8,189 |  |  | 250 |  |  | (9,587 | )
Foreign exchange adjustment |  |  | (303 | ) |  | 245 |  |  | (12 | ) |  | - |  |  | (70 | )
Cash movements excluding exchange movements |  |  | 2,777 |  |  | 7 |  |  | 2,370 |  |  | 705 |  |  | 5,859 |
Other non-cash movements |  |  | (29 | ) |  | (21 | ) |  | - |  |  | 3 |  |  | (47 | )
Closing balance |  |  | (15,173 | ) |  | (177 | ) |  | 10,547 |  |  | 958 |  |  | (3,845 | )
(a) | Borrowings (including finance leases) at 31 December 2018 differ from total borrowings on the balance sheet as they exclude overdrafts of US$1 million (31 December 2017: US$3 million), other current financial liabilities of US$761 million (31 December 2017: US$352 million) and other non-current financial liabilities US$407 million (31 December 2017: US$524 million).
(b) | Closing cash/overdrafts at 31 December 2018 differ from cash and cash equivalents on the balance sheet as they include overdrafts of US$1 million which have been classified as a financial liability (31 December 2017: US$3 million). 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$2,522 million (2017: US$958 million) of highly liquid financial assets held in managed investment funds classified as held for trading.

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