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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, 2020
Dec. 31, 2019
Disclosure Of Lease Liabilities Rollforward Abstract    
Beginning balance $ 1,791  
Additions and contact modifications 125  
Payments (219) $ (224)
Interest 70 76
Translation adjustment (100)  
Ending balance 1,667 1,791
Variable lease payments not included in the measurement of lease liabilities 63 560
Ports    
Disclosure Of Lease Liabilities Rollforward Abstract    
Beginning balance 750  
Additions and contact modifications 50  
Payments (71)  
Interest 30  
Translation adjustment (16)  
Ending balance 743 750
Vessels    
Disclosure Of Lease Liabilities Rollforward Abstract    
Beginning balance 580  
Payments (72)  
Interest 25  
Ending balance 533 580
Pellets plants    
Disclosure Of Lease Liabilities Rollforward Abstract    
Beginning balance 175  
Additions and contact modifications 39  
Payments (36)  
Interest 4  
Translation adjustment (45)  
Ending balance 137 175
Properties    
Disclosure Of Lease Liabilities Rollforward Abstract    
Beginning balance 152  
Additions and contact modifications 32  
Payments (17)  
Interest 7  
Translation adjustment (32)  
Ending balance 142 152
Energy plants    
Disclosure Of Lease Liabilities Rollforward Abstract    
Beginning balance 71  
Payments (2)  
Interest 1  
Translation adjustment (8)  
Ending balance 62 71
Mining equipment and locomotives    
Disclosure Of Lease Liabilities Rollforward Abstract    
Beginning balance 63  
Additions and contact modifications 4  
Payments (21)  
Interest 3  
Translation adjustment 1  
Ending balance $ 50 $ 63