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Segmental information - additional information - Consolidated sales revenue by product (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of products and services [line items]    
Revenue from contracts with customers $ 31,803 $ 19,316
Other Revenue 1,280 46
Consolidated sales revenue 33,083 19,362
Share of equity accounted unit sales and intra-subsidiary/equity accounted unit sales    
Disclosure of products and services [line items]    
Gross product sales 1,545 971
Gross product sales    
Disclosure of products and services [line items]    
Consolidated sales revenue 34,628 20,333
Iron Ore    
Disclosure of products and services [line items]    
Revenue from contracts with customers 21,964 12,182
Other Revenue 1,108 82
Consolidated sales revenue 23,072 12,264
Aluminium, Alumina and Bauxite    
Disclosure of products and services [line items]    
Revenue from contracts with customers 5,733 4,454
Other Revenue 84 (19)
Consolidated sales revenue 5,817 4,435
Copper    
Disclosure of products and services [line items]    
Revenue from contracts with customers 1,472 642
Other Revenue 77 (9)
Consolidated sales revenue 1,549 633
Industrial minerals    
Disclosure of products and services [line items]    
Revenue from contracts with customers 1,141 991
Other Revenue 4 (7)
Consolidated sales revenue 1,145 984
Gold    
Disclosure of products and services [line items]    
Revenue from contracts with customers 506 214
Other Revenue (6) 4
Consolidated sales revenue 500 218
Diamonds    
Disclosure of products and services [line items]    
Revenue from contracts with customers 160 141
Other Revenue 0 0
Consolidated sales revenue 160 141
Other products(b)    
Disclosure of products and services [line items]    
Revenue from contracts with customers 827 692
Other Revenue 13 (5)
Consolidated sales revenue 840 687
Uranium    
Disclosure of products and services [line items]    
Consolidated sales revenue $ 76 $ 149