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Operating segments - additional information - Consolidated sales revenue by product (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of products and services [line items] |  |  |
Revenue from contracts with customers | $ 42,987 | $ 40,594 |
Other revenue | 178 | (72) |
Consolidated sales revenue | 43,165 | 40,522 | $ 40,030
Sales revenue adjustment by product |  | 75 |
Share of equity accounted units and adjustments [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Share of equity accounted unit sales and intra-subsidiary/equity accounted unit sales | 2,202 | 2,313 | 1,837
Gross sales revenue [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Consolidated sales revenue | 45,367 | 42,835 | 41,867
Iron ore [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue from contracts with customers | 25,516 | 19,888 |
Other revenue | 229 | (21) |
Consolidated sales revenue | 25,745 | 19,867 | 20,010
Aluminium [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue from contracts with customers | 10,207 | 12,041 |
Other revenue | (32) | (22) |
Consolidated sales revenue | 10,175 | 12,019 | 10,864
Copper [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue from contracts with customers | 2,030 | 2,420 |
Other revenue | (7) | (32) |
Consolidated sales revenue | 2,023 | 2,388 | 1,760
Coal [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue from contracts with customers | 0 | 986 |
Other revenue | 0 | 3 |
Consolidated sales revenue | 0 | 989 | 2,822
Industrial minerals [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue from contracts with customers | 2,251 | 2,168 |
Other revenue | (12) | 0 |
Consolidated sales revenue | 2,239 | 2,168 | 2,085
Sales revenue adjustment by product |  |  | 25
Gold [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue from contracts with customers | 667 | 869 |
Other revenue | 2 | 0 |
Consolidated sales revenue | 669 | 869 | 378
Diamonds [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue from contracts with customers | 619 | 695 |
Other revenue | 0 | 0 |
Consolidated sales revenue | 619 | 695 | 706
Other [Member] |  |  |
Disclosure of products and services [line items] |  |  |
Revenue from contracts with customers | 1,697 | 1,527 |
Other revenue | (2) | 0 |
Consolidated sales revenue | $ 1,695 | 1,527 | 1,405
Sales revenue adjustment by product |  | $ (75) | $ (25)

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