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9. PROPERTY, PLANT AND EQUIPMENT (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning R$ 18,046,864  
Effect of foreign exchange differences 15,136  
Acquisitions 2,492,669  
Capitalized interest 117,189 R$ 71,611
Write-off (114,603)  
Depreciation (1,466,219)  
Transfer to intangible assets (11,896)  
Right of use- Initial recognition 640,989  
Right of use - Remesurement (151,558)  
ARO Update 225,125  
Transfer to Investment Property (101,195)  
Consolidation CBSI 9,123  
Others (680)  
Balance at end 19,700,944 18,046,864
Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 30,269,600  
Capitalized interest  
Balance at end 33,154,403 30,269,600
Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (12,222,736)  
Capitalized interest  
Balance at end (13,453,459) (12,222,736)
Right-of-use assets [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning  
Acquisitions 43,111  
Write-off (1,354)  
Depreciation (58,843)  
Right of use- Initial recognition 640,989  
Right of use - Remesurement (151,558)  
Balance at end 472,345
Right-of-use assets [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning  
Capitalized interest  
Right of use- Initial recognition 531,044  
Balance at end 531,044
Right-of-use assets [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning  
Capitalized interest  
Right of use- Initial recognition (58,699)  
Balance at end (58,699)
Land [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 287,854  
Effect of foreign exchange differences 1,499  
Acquisitions 6,125  
Write-off (2,143)  
Transfers to other asset categories 790  
Transfer to Investment Property (67,176)  
Balance at end 226,949 287,854
Land [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 287,854  
Capitalized interest  
Right of use - Remesurement  
Balance at end 226,949 287,854
Land [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning  
Capitalized interest  
Balance at end  
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] | Right-of-use assets [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition 401,746  
Land [Member] | Right-of-use assets [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition (21,180)  
Buildings and Infrastructure [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 2,678,638  
Effect of foreign exchange differences 2,978  
Acquisitions 16,116  
Capitalized interest 13  
Write-off (130)  
Depreciation (135,313)  
Transfers to other asset categories 294,872  
Transfer to intangible assets (31)  
ARO Update 225,125  
Transfer to Investment Property (20,030)  
Balance at end 3,062,238 2,678,638
Buildings and Infrastructure [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 3,751,429  
Capitalized interest  
Balance at end 4,250,471 3,751,429
Buildings and Infrastructure [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (1,072,791)  
Capitalized interest  
Balance at end (1,188,233) (1,072,791)
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] | Right-of-use assets [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition 73,344  
Buildings and Infrastructure [Member] | Right-of-use assets [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition (9,190)  
Machinery, Equipment and Facilities [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 11,687,271  
Effect of foreign exchange differences 8,033  
Acquisitions 459,460  
Write-off (80,426)  
Depreciation (1,241,026)  
Transfers to other asset categories 1,766,047  
Consolidation CBSI 4,940  
Others (680)  
Balance at end 12,603,619 11,687,271
Machinery, Equipment and Facilities [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 22,426,782  
Capitalized interest  
Balance at end 24,372,514 22,426,782
Machinery, Equipment and Facilities [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (10,739,511)  
Capitalized interest  
Balance at end (11,768,895) (10,739,511)
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] | Right-of-use assets [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition 39,455  
Machinery, Equipment and Facilities [Member] | Right-of-use assets [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition (15,311)  
Fixtures and Fixtures [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 30,530  
Effect of foreign exchange differences 106  
Acquisitions 1,763  
Write-off (1)  
Depreciation (5,999)  
Transfers to other asset categories 2,629  
Consolidation CBSI (573)  
Balance at end 28,455 30,530
Fixtures and Fixtures [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 165,331  
Capitalized interest  
Balance at end 170,229 165,331
Fixtures and Fixtures [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (134,801)  
Capitalized interest  
Balance at end (141,774) (134,801)
Construction in progress [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 3,282,436  
Effect of foreign exchange differences 2,464  
Acquisitions 1,924,520  
Capitalized interest 117,176  
Write-off (30,400)  
Transfers to other asset categories (2,053,290)  
Transfer to intangible assets (11,865)  
Transfer to Investment Property (13,989)  
Balance at end 3,217,052 3,282,436
Construction in progress [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 3,282,436  
Capitalized interest  
Balance at end 3,217,052 3,282,436
Construction in progress [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning  
Capitalized interest  
Balance at end  
Other [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning [1] 80,135  
Effect of foreign exchange differences [1] 56  
Acquisitions [1] 41,574  
Write-off [1] (149)  
Depreciation [1] (25,038)  
Transfers to other asset categories [1] (11,048)  
Consolidation CBSI [1] 4,756  
Balance at end [1] 90,286 80,135
Other [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning [1] 355,768  
Capitalized interest [1]  
Balance at end [1] 386,144 355,768
Other [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning [1] (275,633)  
Capitalized interest  
Balance at end [1] (295,858) R$ (275,633)
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] | Right-of-use assets [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition 16,499  
Other [Member] | Right-of-use assets [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Right of use- Initial recognition R$ (13,018)  
[1] Refer basically to railway assets such as courtyards, tracks, mines and dormant and in the group leasehold improvements, vehicles, hardware.