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Property, plant and equipment - Leases (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Property, plant and equipment  
Right-of-use assets  
Beginning balance $ 1,692
Additions and contract modifications 125
Depreciation (173)
Translation adjustment (81)
Ending balance 1,563
Ports  
Right-of-use assets  
Beginning balance 734
Additions and contract modifications 50
Depreciation (40)
Translation adjustment (26)
Ending balance 718
Vessels  
Right-of-use assets  
Beginning balance 582
Depreciation (47)
Translation adjustment (1)
Ending balance 534
Pellets plants  
Right-of-use assets  
Beginning balance 161
Additions and contract modifications 39
Depreciation (41)
Translation adjustment (28)
Ending balance 131
Properties  
Right-of-use assets  
Beginning balance 133
Additions and contract modifications 32
Depreciation (29)
Translation adjustment (24)
Ending balance 112
Energy plants  
Right-of-use assets  
Beginning balance 64
Depreciation (7)
Translation adjustment (1)
Ending balance 56
Mining equipment and locomotives  
Right-of-use assets  
Beginning balance 18
Additions and contract modifications 4
Depreciation (9)
Translation adjustment (1)
Ending balance $ 12