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Trade and other receivables (Tables) | 12 Months Ended
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Dec. 31, 2017
Trade And Other Receivables [Abstract] |
Summary of trade and other receivables |
| Non-current |  | Current |  | Total |  | Non-current |  | Current |  | Total |
|  | 2017 |  |  | 2017 |  |  | 2017 |  |  | 2016 |  |  | 2016 |  |  | 2016 |
| US$m |  | US$m |  | US$m |  | US$m |  | US$m |  | US$m |
Trade receivables (a) |  | 1 |  |  | 2,314 |  |  | 2,315 |  |  | - |  |  | 2,283 |  |  | 2,283 |
Other receivables |  | 526 |  |  | 820 |  |  | 1,346 |  |  | 347 |  |  | 880 |  |  | 1,227 |
Prepayment of tolling charges to jointly controlled entities (b) |  | 269 |  |  | - |  |  | 269 |  |  | 267 |  |  | - |  |  | 267 |
Pension surpluses (note 44) |  | 871 |  |  | - |  |  | 871 |  |  | 625 |  |  | - |  |  | 625 |
Amounts due from equity accounted units |  | - |  |  | 30 |  |  | 30 |  |  | - |  |  | 31 |  |  | 31 |
Other prepayments |  | 57 |  |  | 279 |  |  | 336 |  |  | 103 |  |  | 266 |  |  | 369 |
|  | 1,724 |  |  | 3,443 |  |  | 5,167 |  |  | 1,342 |  |  | 3,460 |  |  | 4,802 |
(a) | At 31 December 2017, trade and other receivables are stated net of provisions for doubtful debts of US$55 million (2016: US$66 million). Amounts of US$38 million were impaired during the year, and US$11 million of unused provision reversed.
(b) | These prepayments will be charged to Group operating costs as processing takes place.
Summary of ageing receivables | The ageing of these receivables is as follows:
|  |  |  |  |  | 2017 |  |  | 2016 |
|  |  |  |  | US$m |  | US$m |
less than 30 days overdue |  |  |  |  |  | 122 |  |  | 196 |
between 30 and 60 days overdue |  |  |  |  |  | 3 |  |  | 4 |
between 60 and 90 days overdue |  |  |  |  |  | 17 |  |  | 7 |
more than 90 days overdue |  |  |  |  |  | 3 |  |  | 23 |
|  |  |  |  |  | 145 |  |  | 230 |

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- Definition The disclosure of aging of trade and other receivables over due but not impaired. + References No definition available. + Details
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- Definition The disclosure of detailed information about trade and other receivables. + References No definition available. + Details
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