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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)