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Property, plant and equipment - Right-of-use assets (Leases) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Property, plant and equipment [member]  
Right-of-use assets  
Beginning balance $ 1,563
Additions and contract modifications 218
Impairment (13)
Impairment of discontinued operations (note 16a) (33)
Depreciation (171)
Translation adjustment (27)
Ending balance 1,537
Ports  
Right-of-use assets  
Beginning balance 718
Additions and contract modifications 30
Impairment (13)
Depreciation (48)
Translation adjustment (7)
Ending balance 680
Vessels  
Right-of-use assets  
Beginning balance 534
Depreciation (42)
Ending balance 492
Pellets plants  
Right-of-use assets  
Beginning balance 131
Additions and contract modifications 130
Depreciation (37)
Translation adjustment (9)
Ending balance 215
Properties  
Right-of-use assets  
Beginning balance 112
Additions and contract modifications 8
Depreciation (25)
Translation adjustment (11)
Ending balance 84
Energy plants  
Right-of-use assets  
Beginning balance 56
Depreciation (7)
Ending balance 49
Mining equipment and locomotives  
Right-of-use assets  
Beginning balance 12
Additions and contract modifications 50
Impairment of discontinued operations (note 16a) (33)
Depreciation (12)
Ending balance $ 17