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TRADE AND OTHER RECEIVABLES - Aging of trade receivables (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Aging of trade receivables |  |
Trade receivables, current | $ 619 | $ 609
Neither past due nor impaired |  |
Aging of trade receivables |  |
Trade receivables, current | 427 | 371
Less than 30 days past due | Past due but not impaired |  |
Aging of trade receivables |  |
Trade receivables, current | 101 | 86
Between 30 and 120 days past due | Past due but not impaired |  |
Aging of trade receivables |  |
Trade receivables, current | 53 | 81
Greater than 120 days past due | Past due but not impaired |  |
Aging of trade receivables |  |
Trade receivables, current | $ 38 | $ 71

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