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TRADE AND OTHER RECEIVABLES - Aging of trade receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
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