16. Trade and other receivables
| 2017 $m |
2016 $m |
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Current |
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Trade receivables |
452 | 368 | ||||||
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Other receivables |
23 | 25 | ||||||
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Prepayments |
74 | 77 | ||||||
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Loans to and receivables from associates |
2 | 2 | ||||||
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| 551 | 472 | |||||||
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Non-current |
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Loans to associates |
— | 8 | ||||||
Trade and other receivables are designated as loans and receivables and are held at amortised cost.
Trade receivables are non-interest-bearing and are generally on payment terms of up to 30 days. The fair value of trade and other receivables approximates their carrying value.
The maximum exposure to credit risk for trade and other receivables, excluding prepayments, at the end of the reporting period by geographic region is:
| 2017 $m |
2016 $m |
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Americas |
305 | 256 | ||||||
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Europe |
51 | 43 | ||||||
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AMEA |
71 | 61 | ||||||
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Greater China |
50 | 43 | ||||||
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| 477 | 403 | |||||||
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The ageing of trade and other receivables, excluding prepayments, at the end of the reporting period is:
| 2017 | 2016 | |||||||||||||||||||||||
| Gross $m |
Provision $m |
Net $m |
Gross $m |
Provision $m |
Net $m |
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Not past due |
333 | (1 | ) | 332 | 289 | (1 | ) | 288 | ||||||||||||||||
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Past due 1 to 30 days |
68 | (2 | ) | 66 | 58 | (3 | ) | 55 | ||||||||||||||||
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Past due 31 to 180 days |
82 | (7 | ) | 75 | 64 | (7 | ) | 57 | ||||||||||||||||
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Past due more than 180 days |
71 | (67 | ) | 4 | 61 | (58 | ) | 3 | ||||||||||||||||
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| 554 | (77 | ) | 477 | 472 | (69 | ) | 403 | |||||||||||||||||
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The credit risk relating to balances not past due is not deemed to be significant.
The movement in the provision for impairment of trade and other receivables during the year is as follows:
| 2017 $m |
2016 $m |
2015 $m |
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At 1 January |
(69 | ) | (56 | ) | (47 | ) | ||||||
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Provided |
(15 | ) | (25 | ) | (28 | ) | ||||||
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Amounts written back |
2 | 5 | 12 | |||||||||
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Amounts written off |
6 | 5 | 7 | |||||||||
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Exchange adjustments |
(1 | ) | 2 | — | ||||||||
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At 31 December |
(77 | ) | (69 | ) | (56 | ) | ||||||
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