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Information by business segment and by geographic area - Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Information by business segment and by geographic area            
Product inventory $ 3,780   $ 3,780   $ 3,273  
Investments in associates and joint ventures 2,197 $ 2,071 2,197 $ 2,071 2,031 $ 2,798
Property, plant and equipment and intangible 54,881   54,881   50,444  
Capital expenditures - Sustaining capital 929 843 1,786 1,822    
Capital expenditures - Project execution 210 124 362 269    
Depreciation, depletion and amortization 849 807 1,580 1,622    
Ferrous minerals            
Information by business segment and by geographic area            
Product inventory 2,403   2,403   2,017  
Investments in associates and joint ventures 1,250   1,250   1,154  
Property, plant and equipment and intangible 30,567   30,567   29,436  
Capital expenditures - Sustaining capital 535 482 1,061 1,018    
Capital expenditures - Project execution 113 59 195 150    
Depreciation, depletion and amortization 455 478 852 900    
Goodwill 1,426   1,426   1,373  
Base metals            
Information by business segment and by geographic area            
Product inventory 1,288   1,288   1,231  
Investments in associates and joint ventures 17   17   18  
Property, plant and equipment and intangible 20,155   20,155   19,549  
Capital expenditures - Sustaining capital 357 295 648 595    
Capital expenditures - Project execution 69 63 137 115    
Depreciation, depletion and amortization 367 309 684 651    
Goodwill 1,975   1,975   1,926  
Coal            
Information by business segment and by geographic area            
Product inventory 89   89   25  
Property, plant and equipment and intangible 2,342   2,342      
Capital expenditures - Sustaining capital 36 31 65 111    
Depreciation, depletion and amortization 17   17 19    
Others            
Information by business segment and by geographic area            
Investments in associates and joint ventures 930   930   859  
Property, plant and equipment and intangible 1,817   1,817   $ 1,459  
Capital expenditures - Sustaining capital 1 35 12 98    
Capital expenditures - Project execution 28 2 30 4    
Depreciation, depletion and amortization $ 10 20 $ 27 52    
Reclassification of VNC to others            
Information by business segment and by geographic area            
Capital expenditures - Sustaining capital   34   95    
Depreciation, depletion and amortization   $ 8   $ 26