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Property, plant and equipment - Right-of-use assets (Leases) (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Property, plant and equipment  
Right-of-use assets  
Beginning balance $ 1,563
Additions and contract modifications 78
Depreciation (81)
Translation adjustment 11
Ending balance 1,571
Ports  
Right-of-use assets  
Beginning balance 718
Depreciation (23)
Translation adjustment 4
Ending balance 699
Vessels  
Right-of-use assets  
Beginning balance 534
Depreciation (20)
Ending balance 514
Pellets plants  
Right-of-use assets  
Beginning balance 131
Additions and contract modifications 37
Depreciation (18)
Translation adjustment 6
Ending balance 156
Properties  
Right-of-use assets  
Beginning balance 112
Additions and contract modifications 3
Depreciation (13)
Translation adjustment 1
Ending balance 103
Energy plants  
Right-of-use assets  
Beginning balance 56
Depreciation (3)
Ending balance 53
Mining equipment and locomotives (i)  
Right-of-use assets  
Beginning balance 12
Additions and contract modifications 38
Depreciation (4)
Ending balance 46
Nacala Logistics Corridor  
Right-of-use assets  
Additions and contract modifications $ 33