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Trade and other payables - Summary of Trade and other payables (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Trade And Other Payables [Abstract] |  |
Non-current deferred income | $ 246 | $ 234
Non-current accruals | 13 | 1
Non-current other payables | 352 | 309
Non-current royalties and mining taxes | 4 | 3
Non-current amounts owed to equity accounted units | 156 | 151
Non-current government grants deferred | 85 | 91
Non-current trade and other payables | 856 | 789
Current trade payables | 3,255 | 2,787
Current deferred income | 246 | 197
Current accruals | 1,347 | 973
Current other payables | 964 | 1,072
Current employee entitlements | 734 | 720
Current royalties and mining taxes | 492 | 516
Current amounts owed to equity accounted units | 19 | 92
Current government grants deferred | 4 | 4
Current trade and other payables | 7,061 | 6,361
Trade payables | 3,255 | 2,787
Deferred income | 492 | 431
Accruals | 1,360 | 974
Other payables | 1,316 | 1,381
Employee entitlements | 734 | 720
Royalties and mining taxes | 496 | 519
Amounts owed to equity accounted units | 175 | 243
Government grants deferred | 89 | 95
Trade and other payables | $ 7,917 | $ 7,150

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