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11. PROPERTY, PLANT AND EQUIPMENT (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning R$ 19,700,944 R$ 18,046,864
Effect of foreign exchange differences 287,995 15,136
Acquisitions 1,762,281 2,492,669
Capitalized interest (notes 28 and 33) [1] 92,506 117,189
Write-offs (note 27) (12,998) (114,603)
Depreciation (note 26) (2,439,322) (1,466,219)
Transfers to other asset categories  
Transfer to intangible assets (4,633) (11,896)
Right of use- Initial recognition   640,989
Right of use - Remesurement 60,058 (151,558)
Update of the ARO (Asset retirement obligation) 269,445 225,125
Transfers to investment property   (101,195)
Consolidation CBSI   9,123
Others (53) (680)
Balance at end 19,716,223 19,700,944
Right-of-use assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning [1] 472,345  
Effect of foreign exchange differences [1] 4,329  
Acquisitions 49,934 [1] 43,111
Write-offs (note 27) (7,318) [1] (1,354)
Depreciation (note 26) (62,680) [1] (58,843)
Right of use- Initial recognition   640,989
Right of use - Remesurement 60,058 [1] (151,558)
Balance at end [1] 516,668 472,345
Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 33,154,403 30,269,600
Effect of foreign exchange differences
Balance at end 36,136,110 33,154,403
Cost [member] | Right-of-use assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning [1] 531,044  
Effect of foreign exchange differences  
Balance at end [1] 634,786 531,044
Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (13,453,459) (12,222,736)
Effect of foreign exchange differences
Balance at end (16,419,887) (13,453,459)
Accumulated depreciation [member] | Right-of-use assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning [1] (58,699)  
Effect of foreign exchange differences  
Balance at end [1] (118,118) (58,699)
Land [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 226,949 287,854
Effect of foreign exchange differences 30,271 1,499
Acquisitions 654 6,125
Write-offs (note 27) (188) (2,143)
Depreciation (note 26) (458)  
Transfers to other asset categories 458 790
Transfers to investment property   (67,176)
Balance at end 257,686 226,949
Land [member] | Right-of-use assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition   556,133
Land [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 226,949 287,854
Effect of foreign exchange differences
Balance at end 257,686 226,949
Buildings and infrastructure [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 3,062,238 2,678,638
Effect of foreign exchange differences 57,838 2,978
Acquisitions 865 16,116
Capitalized interest (notes 28 and 33) [1]   13
Write-offs (note 27)   (130)
Depreciation (note 26) (780,395) (135,313)
Transfers to other asset categories 67,574 294,872
Transfer to intangible assets   (31)
Update of the ARO (Asset retirement obligation) 269,445 225,125
Transfers to investment property   (20,030)
Balance at end 2,677,565 3,062,238
Buildings and infrastructure [member] | Right-of-use assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition   54,513
Buildings and infrastructure [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 4,250,471 3,751,429
Effect of foreign exchange differences
Balance at end 4,752,412 4,250,471
Buildings and infrastructure [member] | Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (1,188,233) (1,072,791)
Effect of foreign exchange differences
Balance at end (2,074,847) (1,188,233)
Machinery, equipment and facilities [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 12,603,619 11,687,271
Effect of foreign exchange differences 186,591 8,033
Acquisitions 122,744 459,460
Write-offs (note 27) (3,073) (80,426)
Depreciation (note 26) (1,564,525) (1,241,026)
Transfers to other asset categories 1,112,024 1,766,047
Transfer to intangible assets  
Right of use- Initial recognition  
Right of use - Remesurement  
Update of the ARO (Asset retirement obligation)  
Transfers to investment property  
Consolidation CBSI   4,940
Others 3 (680)
Balance at end 12,457,383 12,603,619
Machinery, equipment and facilities [member] | Right-of-use assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition   9,783
Machinery, equipment and facilities [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 24,372,514 22,426,782
Effect of foreign exchange differences
Balance at end 26,213,225 24,372,514
Machinery, equipment and facilities [member] | Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (11,768,895) (10,739,511)
Effect of foreign exchange differences
Balance at end (13,755,842) (11,768,895)
Fixtures and fixtures [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 28,455 30,530
Effect of foreign exchange differences 2,416 106
Acquisitions 874 1,763
Write-offs (note 27) (33) (1)
Depreciation (note 26) (6,747) (5,999)
Transfers to other asset categories 1,338 2,629
Transfer to intangible assets  
Right of use- Initial recognition  
Right of use - Remesurement  
Update of the ARO (Asset retirement obligation)  
Transfers to investment property  
Consolidation CBSI   (573)
Others (6)
Balance at end 26,297 28,455
Fixtures and fixtures [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 170,229 165,331
Effect of foreign exchange differences
Balance at end 182,974 170,229
Fixtures and fixtures [member] | Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (141,774) (134,801)
Effect of foreign exchange differences
Balance at end (156,677) (141,774)
Construction in progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 3,217,052 3,282,436
Effect of foreign exchange differences 4,727 2,464
Acquisitions 1,583,054 1,924,520
Capitalized interest (notes 28 and 33) [1] 92,506 117,176
Write-offs (note 27) (9) (30,400)
Transfers to other asset categories (1,212,373) (2,053,290)
Transfer to intangible assets (4,633) (11,865)
Right of use- Initial recognition  
Right of use - Remesurement  
Update of the ARO (Asset retirement obligation)  
Transfers to investment property   (13,989)
Consolidation CBSI  
Others (2)
Balance at end 3,680,322 3,217,052
Construction in progress [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 3,217,052 3,282,436
Effect of foreign exchange differences
Balance at end 3,680,322 3,217,052
Other [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning [2] 90,286 80,135
Effect of foreign exchange differences [2] 1,823 56
Acquisitions [2] 4,156 41,574
Write-offs (note 27) [2] (2,377) (149)
Depreciation (note 26) [2] (24,517) (25,038)
Transfers to other asset categories [2] 30,979 (11,048)
Transfer to intangible assets [2]  
Right of use- Initial recognition [2]  
Right of use - Remesurement [2]  
Update of the ARO (Asset retirement obligation) [2]  
Transfers to investment property [2]  
Consolidation CBSI [2]   4,756
Others [2] (48)
Balance at end [2] 100,302 90,286
Other [member] | Right-of-use assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition   20,560
Other [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning [2] 386,144 355,768
Effect of foreign exchange differences
Balance at end [2] 414,705 386,144
Other [member] | Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning [2] (295,858) (275,633)
Effect of foreign exchange differences
Balance at end [2] R$ (314,403) R$ (295,858)
[1] The cost of capitalized interest is calculated, basically, for Mining projects that substantially refer to the expansion of Casa de Pedra (MG) and TECAR (RJ) - see notes 28 and 33. The average rate used for the capitalization of interest on non-specific projects in the period ended December 31 2020 was 5.62% per year (6.58% per year as of December 31, 2019).
[2] Refer substantially to: i) in the consolidated picture: assets for railway use, such as yards, rails, mines and dormant;