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Operating segments - Summary of capital expenditure within the reportable segments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [Line Items]      
Capital expenditure $ 4,344 $ 2,658 $ 4,588
Sales of property, plant and equipment and intangible assets 138 354 97
Capital expenditure per cash flow statement 4,482 3,012 4,685
Reportable segments [Member]      
Disclosure of operating segments [Line Items]      
Capital expenditure 4,691 3,355 5,382
Reportable segments [Member] | Iron Ore [Member]      
Disclosure of operating segments [Line Items]      
Capital expenditure 1,201 868 1,608
Reportable segments [Member] | Aluminium [Member]      
Disclosure of operating segments [Line Items]      
Capital expenditure 1,436 916 1,682
Reportable segments [Member] | Copper & Diamonds [member]      
Disclosure of operating segments [Line Items]      
Capital expenditure 1,622 1,441 1,576
Reportable segments [Member] | Energy & Minerals [Member]      
Disclosure of operating segments [Line Items]      
Capital expenditure 467 141 552
Reportable segments [Member] | Other operations [Member]      
Disclosure of operating segments [Line Items]      
Capital expenditure (35) (11) (36)
Other items [Member]      
Disclosure of operating segments [Line Items]      
Capital expenditure 70 (46) 65
Share of equity accounted units and adjustments [Member]      
Disclosure of operating segments [Line Items]      
Capital expenditure $ (417) $ (651) $ (859)