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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Lease liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Lease Liabilities Rollforward Abstract      
Beginning balance $ 1,667    
Additions and contact modifications 238    
Payment (228)    
Interest 68    
Transfer to held for sale (91)    
Translation adjustment (52)    
Ending balance 1,602 $ 1,667  
Variable lease payments not included in the measurement of lease liabilities 395 63 $ 560
Ports      
Disclosure Of Lease Liabilities Rollforward Abstract      
Beginning balance 743    
Additions and contact modifications 30    
Payment (75)    
Interest 28    
Translation adjustment (13)    
Ending balance 713 743  
Vessels      
Disclosure Of Lease Liabilities Rollforward Abstract      
Beginning balance 533    
Payment (65)    
Interest 21    
Ending balance 489 533  
Pellets plants      
Disclosure Of Lease Liabilities Rollforward Abstract      
Beginning balance 137    
Additions and contact modifications 130    
Payment (40)    
Interest 7    
Translation adjustment (9)    
Ending balance 225 137  
Properties      
Disclosure Of Lease Liabilities Rollforward Abstract      
Beginning balance 142    
Additions and contact modifications 8    
Payment (28)    
Interest 5    
Transfer to held for sale (2)    
Translation adjustment (22)    
Ending balance 103 142  
Energy plants      
Disclosure Of Lease Liabilities Rollforward Abstract      
Beginning balance 62    
Payment (8)    
Interest 5    
Ending balance 59 62  
Mining equipment and locomotives      
Disclosure Of Lease Liabilities Rollforward Abstract      
Beginning balance 50    
Additions and contact modifications 70    
Payment (12)    
Interest 2    
Transfer to held for sale (89)    
Translation adjustment (8)    
Ending balance 13 $ 50  
Coal      
Disclosure Of Lease Liabilities Rollforward Abstract      
Interest 5    
Nacala Logistics Corridor      
Disclosure Of Lease Liabilities Rollforward Abstract      
Additions and contact modifications $ 53