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Product analysis (by revenue type) - Consolidated sales revenue by product (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Disclosure Of Products And Services [Line Items] |  |
Revenue from contracts with customers | $ 19,927 |
Other revenue | (13) |
Consolidated sales revenue | 19,914 | $ 19,319
Iron Ore [Member] |  |
Disclosure Of Products And Services [Line Items] |  |
Revenue from contracts with customers | 9,669 |
Other revenue | (61) |
Consolidated sales revenue | 9,608 | 9,594
Aluminium [Member] |  |
Disclosure Of Products And Services [Line Items] |  |
Revenue from contracts with customers | 6,027 |
Other revenue | 38 |
Consolidated sales revenue | 6,065 | 5,270
Copper [member] |  |
Disclosure Of Products And Services [Line Items] |  |
Revenue from contracts with customers | 1,077 |
Other revenue | 5 |
Consolidated sales revenue | 1,082 | 730
Coal [member] |  |
Disclosure Of Products And Services [Line Items] |  |
Revenue from contracts with customers | 835 |
Other revenue | 5 |
Consolidated sales revenue | 840 | 1,533
Industrial minerals [member] |  |
Disclosure Of Products And Services [Line Items] |  |
Revenue from contracts with customers | 1,067 |
Consolidated sales revenue | 1,067 | 975
Gold [member] |  |
Disclosure Of Products And Services [Line Items] |  |
Revenue from contracts with customers | 228 |
Consolidated sales revenue | 228 | 186
Diamonds [member] |  |
Disclosure Of Products And Services [Line Items] |  |
Revenue from contracts with customers | 323 |
Consolidated sales revenue | 323 | 340
Other Product [Member] |  |
Disclosure Of Products And Services [Line Items] |  |
Revenue from contracts with customers | 701 |
Consolidated sales revenue | 701 | 691
Share of equity accounted unit sales and intra-subsidiary/equity accounted unit sales [member] |  |
Disclosure Of Products And Services [Line Items] |  |
Consolidated sales revenue | 1,293 | 589
Gross Sales Revenue |  |
Disclosure Of Products And Services [Line Items] |  |
Consolidated sales revenue | $ 21,207 | $ 19,908

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