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Operating segments - additional information - Consolidated sales revenue by product (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Products And Services [Line Items] |  |  |
Revenue from contracts with customers | $ 40,594 |  |
Other revenue | (72) |  |
Consolidated sales revenue | 40,522 | $ 40,030 | $ 33,781
Share of equity accounted units and adjustments [Member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Consolidated sales revenue | 2,313 | 1,837 | 1,555
Gross sales revenue [Member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Consolidated sales revenue | 42,835 | 41,867 | 35,336
Iron Ore [Member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Revenue from contracts with customers | 19,888 |  |
Other revenue | (21) |  |
Consolidated sales revenue | 19,867 | 20,010 | 15,855
Aluminium [Member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Revenue from contracts with customers | 12,041 |  |
Other revenue | (22) |  |
Consolidated sales revenue | 12,019 | 10,864 | 9,342
Copper [member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Revenue from contracts with customers | 2,420 |  |
Other revenue | (32) |  |
Consolidated sales revenue | 2,388 | 1,760 | 1,609
Coal [member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Revenue from contracts with customers | 986 |  |
Other revenue | 3 |  |
Consolidated sales revenue | 989 | 2,822 | 2,567
Industrial minerals [member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Revenue from contracts with customers | 2,093 |  |
Consolidated sales revenue | 2,093 | 2,060 | 1,954
Gold [member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Revenue from contracts with customers | 869 |  |
Consolidated sales revenue | 869 | 378 | 608
Diamonds [member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Revenue from contracts with customers | 695 |  |
Consolidated sales revenue | 695 | 706 | 613
Other Product [Member] |  |  |
Disclosure Of Products And Services [Line Items] |  |  |
Revenue from contracts with customers | 1,602 |  |
Consolidated sales revenue | $ 1,602 | $ 1,430 | $ 1,233

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