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Property, plant and equipment - Movements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, plant and equipment    
Balance at beginning of year $ 41,148 $ 46,576
Additions (i) 5,501 4,295
Disposals (192) (228)
Assets retirement obligation (57) (568)
Depreciation, depletion and amortization (2,626) (2,746)
Acquisition of NLC 922  
Impairment of discontinued operations (130) (642)
Transfers to non-current assets held for sale (6) (304)
Translation adjustment (1,654) (6,371)
Balance at end of year 41,931 41,148
Discontinued operations    
Property, plant and equipment    
Impairment of discontinued operations (1,089)  
Building and land    
Property, plant and equipment    
Balance at beginning of year 8,591 10,702
Disposals (13) (14)
Depreciation, depletion and amortization (436) (439)
Acquisition of NLC 235  
Impairment of discontinued operations (11) (130)
Transfers to non-current assets held for sale (2) (66)
Translation adjustment (412) (1,664)
Transfers 416 202
Balance at end of year 8,137 8,591
Building and land | Discontinued operations    
Property, plant and equipment    
Impairment of discontinued operations (231)  
Facilities    
Property, plant and equipment    
Balance at beginning of year 7,591 9,604
Disposals (32) (92)
Depreciation, depletion and amortization (475) (469)
Acquisition of NLC 140  
Impairment of discontinued operations (7) (162)
Transfers to non-current assets held for sale   (80)
Translation adjustment (432) (1,756)
Transfers 561 546
Balance at end of year 7,232 7,591
Facilities | Discontinued operations    
Property, plant and equipment    
Impairment of discontinued operations (114)  
Equipment    
Property, plant and equipment    
Balance at beginning of year 4,933 5,686
Disposals (69) (8)
Depreciation, depletion and amortization (664) (730)
Acquisition of NLC 102  
Impairment of discontinued operations (11) (22)
Transfers to non-current assets held for sale (1) (3)
Translation adjustment (130) (644)
Transfers 669 654
Balance at end of year 4,743 4,933
Equipment | Discontinued operations    
Property, plant and equipment    
Impairment of discontinued operations (86)  
Mineral properties    
Property, plant and equipment    
Balance at beginning of year 8,054 8,261
Disposals (2) (13)
Assets retirement obligation (57) (568)
Depreciation, depletion and amortization (450) (459)
Impairment of discontinued operations (21) (81)
Transfers to non-current assets held for sale   (58)
Translation adjustment (132) (523)
Transfers 236 359
Balance at end of year 7,742 8,054
Railway equipment    
Property, plant and equipment    
Balance at beginning of year 2,523 3,241
Disposals (9) (5)
Depreciation, depletion and amortization (166) (186)
Acquisition of NLC 318  
Translation adjustment (167) (759)
Transfers 152 232
Balance at end of year 2,334 2,523
Railway equipment | Discontinued operations    
Property, plant and equipment    
Impairment of discontinued operations (317)  
Right of use assets    
Property, plant and equipment    
Balance at beginning of year 1,563 1,692
Additions (i) 185 125
Depreciation, depletion and amortization (171) (173)
Acquisition of NLC 33  
Impairment of discontinued operations (13)  
Translation adjustment (27) (81)
Balance at end of year 1,537 1,563
Right of use assets | Discontinued operations    
Property, plant and equipment    
Impairment of discontinued operations (33)  
Others    
Property, plant and equipment    
Balance at beginning of year 2,495 3,012
Disposals (4) (8)
Depreciation, depletion and amortization (264) (290)
Acquisition of NLC 2  
Impairment of discontinued operations (7) (79)
Transfers to non-current assets held for sale   (1)
Translation adjustment (99) (392)
Transfers 365 253
Balance at end of year 2,484 2,495
Others | Discontinued operations    
Property, plant and equipment    
Impairment of discontinued operations (4)  
Constructions in progress    
Property, plant and equipment    
Balance at beginning of year 5,398 4,378
Additions (i) 5,316 4,170
Disposals (63) (88)
Acquisition of NLC 92  
Impairment of discontinued operations (60) (168)
Transfers to non-current assets held for sale (3) (96)
Translation adjustment (255) (552)
Transfers (2,399) (2,246)
Balance at end of year 7,722 5,398
Constructions in progress | Discontinued operations    
Property, plant and equipment    
Impairment of discontinued operations (304)  
Gross carrying amount    
Property, plant and equipment    
Balance at beginning of year 71,687  
Balance at end of year 73,226 71,687
Gross carrying amount | Building and land    
Property, plant and equipment    
Balance at beginning of year 15,135  
Balance at end of year 14,937 15,135
Gross carrying amount | Facilities    
Property, plant and equipment    
Balance at beginning of year 11,690  
Balance at end of year 11,560 11,690
Gross carrying amount | Equipment    
Property, plant and equipment    
Balance at beginning of year 10,680  
Balance at end of year 10,770 10,680
Gross carrying amount | Mineral properties    
Property, plant and equipment    
Balance at beginning of year 17,072  
Balance at end of year 17,036 17,072
Gross carrying amount | Railway equipment    
Property, plant and equipment    
Balance at beginning of year 3,853  
Balance at end of year 3,717 3,853
Gross carrying amount | Right of use assets    
Property, plant and equipment    
Balance at beginning of year 1,966  
Balance at end of year 2,014 1,966
Gross carrying amount | Others    
Property, plant and equipment    
Balance at beginning of year 5,893  
Balance at end of year 5,470 5,893
Gross carrying amount | Constructions in progress    
Property, plant and equipment    
Balance at beginning of year 5,398  
Balance at end of year 7,722 5,398
Accumulated amortization    
Property, plant and equipment    
Balance at beginning of year (30,539)  
Balance at end of year (31,295) (30,539)
Accumulated amortization | Building and land    
Property, plant and equipment    
Balance at beginning of year (6,544)  
Balance at end of year (6,800) (6,544)
Accumulated amortization | Facilities    
Property, plant and equipment    
Balance at beginning of year (4,099)  
Balance at end of year (4,328) (4,099)
Accumulated amortization | Equipment    
Property, plant and equipment    
Balance at beginning of year (5,747)  
Balance at end of year (6,027) (5,747)
Accumulated amortization | Mineral properties    
Property, plant and equipment    
Balance at beginning of year (9,018)  
Balance at end of year (9,294) (9,018)
Accumulated amortization | Railway equipment    
Property, plant and equipment    
Balance at beginning of year (1,330)  
Balance at end of year (1,383) (1,330)
Accumulated amortization | Right of use assets    
Property, plant and equipment    
Balance at beginning of year (403)  
Balance at end of year (477) (403)
Accumulated amortization | Others    
Property, plant and equipment    
Balance at beginning of year (3,398)  
Balance at end of year $ (2,986) $ (3,398)