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Trade and other receivables - Summary of ageing receivables (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Aging Of Trade And Other Receivables Past Due But Not Impaired [Line Items] |  |
Trade receivables | $ 2,315 | $ 2,283
Trade receivables past due but not impaired [Member] |  |
Disclosure Of Aging Of Trade And Other Receivables Past Due But Not Impaired [Line Items] |  |
Trade receivables | 145 | 230
Trade receivables past due but not impaired [Member] | Less than 30 days overdue [member] |  |
Disclosure Of Aging Of Trade And Other Receivables Past Due But Not Impaired [Line Items] |  |
Trade receivables | 122 | 196
Trade receivables past due but not impaired [Member] | Between 30 and 60 days overdue [member] |  |
Disclosure Of Aging Of Trade And Other Receivables Past Due But Not Impaired [Line Items] |  |
Trade receivables | 3 | 4
Trade receivables past due but not impaired [Member] | Between 60 and 90 days overdue [member] |  |
Disclosure Of Aging Of Trade And Other Receivables Past Due But Not Impaired [Line Items] |  |
Trade receivables | 17 | 7
Trade receivables past due but not impaired [Member] | More than 90 days overdue [member] |  |
Disclosure Of Aging Of Trade And Other Receivables Past Due But Not Impaired [Line Items] |  |
Trade receivables | $ 3 | $ 23

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