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Property, plant and equipment - Movements (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Property, plant and equipment    
Balance at beginning of year $ 41,148 $ 46,576
Additions (i) 2,196 1,848
Disposals (44) (55)
Assets retirement obligation (237) 343
Depreciation, depletion and amortization (1,336) (1,492)
Impairment (iii) (88) (692)
Acquisition of NLC (note 12) 922  
Translation adjustment 1,323 (8,316)
Balance at end of year 43,884 38,212
Building and land    
Property, plant and equipment    
Balance at beginning of year 8,591 10,702
Disposals (2) (3)
Depreciation, depletion and amortization (227) (224)
Impairment (iii)   (168)
Acquisition of NLC (note 12) 235  
Translation adjustment 264 (2,098)
Transfers 78 128
Balance at end of year 8,939 8,337
Facilities    
Property, plant and equipment    
Balance at beginning of year 7,591 9,604
Disposals (3) (4)
Depreciation, depletion and amortization (234) (276)
Impairment (iii)   (228)
Acquisition of NLC (note 12) 456  
Translation adjustment 271 (2,116)
Transfers 201 178
Balance at end of year 8,282 7,158
Equipment    
Property, plant and equipment    
Balance at beginning of year 4,933 5,686
Disposals (12) (4)
Depreciation, depletion and amortization (334) (396)
Impairment (iii)   (17)
Acquisition of NLC (note 12) 102  
Translation adjustment 138 (794)
Transfers 301 286
Balance at end of year 5,128 4,761
Mineral properties    
Property, plant and equipment    
Balance at beginning of year 8,054 8,261
Disposals   (8)
Assets retirement obligation (237) 343
Depreciation, depletion and amortization (254) (259)
Impairment (iii)   (123)
Translation adjustment 237 (972)
Transfers 164 359
Balance at end of year 7,964 7,601
Railway equipment    
Property, plant and equipment    
Balance at beginning of year 2,523 3,241
Disposals (1) (1)
Depreciation, depletion and amortization (79) (117)
Acquisition of NLC (note 12) 2  
Translation adjustment 93 (837)
Transfers 53 107
Balance at end of year 2,591 2,393
Right of use assets    
Property, plant and equipment    
Balance at beginning of year 1,563 1,692
Additions (i) 45 36
Depreciation, depletion and amortization (81) (83)
Acquisition of NLC (note 12) 33  
Translation adjustment 11 (114)
Balance at end of year 1,571 1,531
Others    
Property, plant and equipment    
Balance at beginning of year 2,495 3,012
Disposals   (3)
Depreciation, depletion and amortization (127) (137)
Impairment (iii)   (61)
Acquisition of NLC (note 12) 2  
Translation adjustment 80 (566)
Transfers 113 153
Balance at end of year 2,563 2,398
Constructions in progress    
Property, plant and equipment    
Balance at beginning of year 5,398 4,378
Additions (i) 2,151 1,812
Disposals (26) (32)
Impairment (iii) (88) (95)
Acquisition of NLC (note 12) 92  
Translation adjustment 229 (819)
Transfers (910) (1,211)
Balance at end of year 6,846 4,033
Coal asset    
Property, plant and equipment    
Impairment (iii) (88)  
Carrying amount    
Property, plant and equipment    
Balance at end of year 75,917 66,311
Carrying amount | Building and land    
Property, plant and equipment    
Balance at end of year 15,905 14,333
Carrying amount | Facilities    
Property, plant and equipment    
Balance at end of year 12,739 10,825
Carrying amount | Equipment    
Property, plant and equipment    
Balance at end of year 11,251 10,176
Carrying amount | Mineral properties    
Property, plant and equipment    
Balance at end of year 17,406 15,929
Carrying amount | Railway equipment    
Property, plant and equipment    
Balance at end of year 4,047 3,579
Carrying amount | Right of use assets    
Property, plant and equipment    
Balance at end of year 2,011 1,837
Carrying amount | Others    
Property, plant and equipment    
Balance at end of year 5,712 5,599
Carrying amount | Constructions in progress    
Property, plant and equipment    
Balance at end of year 6,846 4,033
Accumulated amortization    
Property, plant and equipment    
Balance at end of year (32,033) (28,099)
Accumulated amortization | Building and land    
Property, plant and equipment    
Balance at end of year (6,966) (5,996)
Accumulated amortization | Facilities    
Property, plant and equipment    
Balance at end of year (4,457) (3,667)
Accumulated amortization | Equipment    
Property, plant and equipment    
Balance at end of year (6,123) (5,415)
Accumulated amortization | Mineral properties    
Property, plant and equipment    
Balance at end of year (9,442) (8,328)
Accumulated amortization | Railway equipment    
Property, plant and equipment    
Balance at end of year (1,456) (1,186)
Accumulated amortization | Right of use assets    
Property, plant and equipment    
Balance at end of year (440) (306)
Accumulated amortization | Others    
Property, plant and equipment    
Balance at end of year $ (3,149) $ (3,201)