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Trade and other receivables (Tables) | 12 Months Ended
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Dec. 31, 2018
Trade And Other Receivables [Abstract] |
Summary of trade and other receivables |
| Non-current |  | Current |  | Total |  | Non-current |  | Current |  | Total |
|  | 2018 |  |  | 2018 |  |  | 2018 |  |  | 2017 |  |  | 2017 |  |  | 2017 |
| US$m |  | US$m |  | US$m |  | US$m |  | US$m |  | US$m |
Trade receivables (a) |  | - |  |  | 2,167 |  |  | 2,167 |  |  | 1 |  |  | 2,314 |  |  | 2,315 |
Other financial receivables (a) |  | 240 |  |  | 550 |  |  | 790 |  |  | 178 |  |  | 462 |  |  | 640 |
Amounts due from equity accounted units |  | - |  |  | 50 |  |  | 50 |  |  | - |  |  | 30 |  |  | 30 |
Other receivables |  | 129 |  |  | 226 |  |  | 355 |  |  | 348 |  |  | 358 |  |  | 706 |
Prepayment of tolling charges to jointly controlled entities (b) |  | 228 |  |  | - |  |  | 228 |  |  | 269 |  |  | - |  |  | 269 |
Pension surpluses (note 44) |  | 935 |  |  | - |  |  | 935 |  |  | 871 |  |  | - |  |  | 871 |
Other prepayments |  | 53 |  |  | 186 |  |  | 239 |  |  | 57 |  |  | 279 |  |  | 336 |
Total |  | 1,585 |  |  | 3,179 |  |  | 4,764 |  |  | 1,724 |  |  | 3,443 |  |  | 5,167 |
(a) | At 31 December 2018, trade and other financial receivables are stated net of allowances for expected credit losses of US$8 million. The 2017 closing provision for doubtful debt under IAS 39 of US$55 million was adjusted by US$7 million (pre-tax) upon adoption of IFRS 9 (refer to note 45). During the year there has been an increase to the provision for expected credit losses of US$2 million and US$42 million has been utilised.
(b) | These prepayments will be charged to Group operating costs as processing takes place.

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