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Schedule of property, plant and equipment (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Balance at beginning R$ 19,716,223 R$ 19,700,944
Effect of foreign exchange differences (6,463) 287,995
Acquisitions 2,993,272 1,762,281
Capitalized interest (1) (notes 29 and 34) [1] 87,414 92,506
Write-offs (note 28) (112,886) (12,998)
Depreciation (note 27) (2,112,657) (2,439,322)
Transfer to intangible assets (29,840) (4,633)
Right of use - Remesurement 109,109 60,058
Update of the ARO (Asset retirement obligation) 2,357 269,445
Others 22 (53)
Transfers to fixed assets to investment property without cash effect (4,066)  
Acquisition of Elizabeth 372,123  
[custom:AcquisitionOfElizabeth1] 627,145  
Increase (decrease) through transfers from (to) investment property, property, plant and equipment 261,504  
Balance at end 21,531,134 19,716,223
Right-of-use assets [member]    
IfrsStatementLineItems [Line Items]    
Effect of foreign exchange differences 26 4,329
Acquisitions 62,106 49,934
Write-offs (note 28) (38,017) (7,318)
Depreciation (note 27) (68,068) (62,680)
Right of use - Remesurement 109,109 60,058
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 36,136,110 33,154,403
Balance at end 40,090,936 36,136,110
Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (16,419,887) (13,453,459)
Balance at end (18,559,802) (16,419,887)
Land [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 257,686 226,949
Effect of foreign exchange differences (932) 30,271
Acquisitions   654
Write-offs (note 28)   (188)
Depreciation (note 27)   (458)
Transfers to other asset categories (3,683) 458
Transfers to fixed assets to investment property without cash effect (4,065)  
Acquisition of Elizabeth 100,489  
Balance at end 349,495 257,686
Land [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 257,686 226,949
Balance at end 349,495 257,686
Buildings [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 2,677,565 3,062,238
Effect of foreign exchange differences (6,402) 57,838
Acquisitions 22,441 865
Write-offs (note 28) (5,051)  
Depreciation (note 27) (163,911) (780,395)
Transfers to other asset categories 265,307 67,574
Update of the ARO (Asset retirement obligation) 2,357 269,445
Transfers to fixed assets to investment property without cash effect (1)  
Acquisition of Elizabeth 227,629  
Balance at end 3,019,934 2,677,565
Buildings [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 4,752,412 4,250,471
Balance at end 5,358,388 4,752,412
Buildings [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (2,074,847) (1,188,233)
Balance at end (2,338,454) (2,074,847)
Machinery [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 12,457,383 12,603,619
Effect of foreign exchange differences (2,627) 186,591
Acquisitions 367,050 122,744
Write-offs (note 28) (62,606) (3,073)
Depreciation (note 27) (1,845,757) (1,564,525)
Transfers to other asset categories 2,347,346 1,112,024
Others 19 3
Acquisition of Elizabeth 278,576  
Transfers to inventory 261,504  
Balance at end 13,800,888 12,457,383
Machinery [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 26,213,225 24,372,514
Balance at end 29,348,048 26,213,225
Machinery [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (13,755,842) (11,768,895)
Balance at end (15,547,160) (13,755,842)
Fixtures and fittings [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 26,297 28,455
Effect of foreign exchange differences 1,418 2,416
Acquisitions 6,756 874
Write-offs (note 28) (194) (33)
Depreciation (note 27) (7,043) (6,747)
Transfers to other asset categories 925 1,338
Others   (6)
Acquisition of Elizabeth 878  
Balance at end 29,037 26,297
Fixtures and fittings [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 182,974 170,229
Balance at end 190,847 182,974
Fixtures and fittings [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (156,677) (141,774)
Balance at end (161,810) (156,677)
Construction in progress [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 3,680,322 3,217,052
Effect of foreign exchange differences 2,076 4,727
Acquisitions 2,527,722 1,583,054
Capitalized interest (1) (notes 29 and 34) [1] 87,414 92,506
Write-offs (note 28) (5,468) (9)
Transfers to other asset categories (2,634,947) (1,212,373)
Transfer to intangible assets (29,840) (4,633)
Others 3 (2)
Acquisition of Elizabeth 16,400  
Balance at end 3,643,682 3,680,322
Construction in progress [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 3,680,322 3,217,052
Balance at end 3,643,682 3,680,322
Right-of-use assets [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 516,668 472,345
Balance at end 581,824 516,668
Right-of-use assets [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 634,786 531,044
Balance at end 754,606 634,786
Right-of-use assets [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (118,118) (58,699)
Balance at end (172,782) (118,118)
Other property, plant and equipment [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning [2] 100,302 90,286
Effect of foreign exchange differences [2] (22) 1,823
Acquisitions [2] 7,197 4,156
Write-offs (note 28) [2] (1,550) (2,377)
Depreciation (note 27) [2] (27,878) (24,517)
Transfers to other asset categories [2] 25,052 30,979
Others [2]   (48)
Acquisition of Elizabeth [2] 3,173  
Balance at end [2] 106,274 100,302
Other property, plant and equipment [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning [2] 414,705 386,144
Balance at end [2] 445,870 414,705
Other property, plant and equipment [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning [2] (314,403) (295,858)
Balance at end [2] R$ (339,596) R$ (314,403)
[1] The cost of capitalized interest is calculated, basically, for the projects in the Steel and Mining which refer, substantially, to:
[2] Refer substantially to assets for railway use, such as yards, rails, mines, and sleepers.