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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Lease liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disclosure Of Lease Liabilities Rollforward Abstract        
Beginning balance     $ 1,667  
Additions and contact modifications     98  
Payments $ (49) $ (49) (104) $ (99)
Interest 16 17 35 35
Translation adjustment     12  
Ending balance 1,708   1,708  
Variable lease payments not included in the measurement of lease liabilities 78 $ 10 111 $ 38
Ports        
Disclosure Of Lease Liabilities Rollforward Abstract        
Beginning balance     743  
Payments     (40)  
Interest     14  
Translation adjustment     1  
Ending balance 718   718  
Vessels        
Disclosure Of Lease Liabilities Rollforward Abstract        
Beginning balance     533  
Payments     (31)  
Interest     11  
Ending balance 513   513  
Pellets plants        
Disclosure Of Lease Liabilities Rollforward Abstract        
Beginning balance     137  
Additions and contact modifications     37  
Payments     (2)  
Interest     3  
Translation adjustment     8  
Ending balance 183   183  
Properties        
Disclosure Of Lease Liabilities Rollforward Abstract        
Beginning balance     142  
Additions and contact modifications     3  
Payments     (24)  
Interest     2  
Translation adjustment     1  
Ending balance 124   124  
Energy plants        
Disclosure Of Lease Liabilities Rollforward Abstract        
Beginning balance     62  
Payments     (2)  
Interest     3  
Ending balance 63   63  
Mining equipment and locomotives (i)        
Disclosure Of Lease Liabilities Rollforward Abstract        
Beginning balance     50  
Additions and contact modifications     58  
Payments     (5)  
Interest     2  
Translation adjustment     2  
Ending balance $ 107   107  
Nacala Logistics Corridor        
Disclosure Of Lease Liabilities Rollforward Abstract        
Additions and contact modifications     $ 53