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Trade and other payables - Summary of Trade and other payables (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
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