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PROPERTY, PLANT AND EQUIPMENT - Accumulated Depreciation (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period R$ 16,443,742 R$ 19,351,891  
Balance, end of period 15,546,481 16,443,742 R$ 19,351,891
Accumulated depreciation      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period (23,496,575) (24,649,708) (27,153,803)
Depreciation (1,584,878) (1,807,355) (2,217,820)
Disposals 299,132 342,045 346,180
Loss of control by selling of subsidiary   672,386 2,173,869
Transfer to assets held for sale 637,929 2,510,269  
Effects of IAS 29 adoption (265,654)    
Foreign exchange effect (1,115,657) (564,212) 2,201,866
Balance, end of period (25,525,703) (23,496,575) (24,649,708)
Land and buildings      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period 5,170,675 5,585,082  
Balance, end of period 4,518,944 5,170,675 5,585,082
Land and buildings | Accumulated depreciation      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period (3,915,023) (3,898,671) (4,387,719)
Depreciation (291,315) (343,373) (334,365)
Transfers 18,341 (38,467) (12,015)
Disposals 29,944 67,598 14,696
Loss of control by selling of subsidiary   28,691 524,209
Transfer to assets held for sale 105,787 370,727  
Foreign exchange effect (129,539) (101,528) 296,523
Balance, end of period (4,181,805) (3,915,023) (3,898,671)
Machines, equipment, and installations      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period 9,439,768 11,029,301  
Balance, end of period 9,242,177 9,439,768 11,029,301
Machines, equipment, and installations | Accumulated depreciation      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period (18,576,836) (19,604,579) (21,415,018)
Depreciation (1,128,138) (1,361,561) (1,738,759)
Transfers 5,234 25,886 (2,368)
Disposals 258,609 218,590 243,429
Loss of control by selling of subsidiary   589,951 1,515,886
Transfer to assets held for sale 286,204 1,989,917  
Effects of IAS 29 adoption (265,654)    
Foreign exchange effect (946,240) (435,040) 1,792,251
Balance, end of period (20,366,821) (18,576,836) (19,604,579)
Data electronic equipment      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period 89,404 112,432  
Balance, end of period 66,132 89,404 112,432
Data electronic equipment | Accumulated depreciation      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period (622,234) (649,642) (827,620)
Depreciation (34,814) (40,915) (44,437)
Transfers 158 (400) 968
Disposals 2,609 12,790 56,466
Loss of control by selling of subsidiary   12,627 95,809
Transfer to assets held for sale 11,667 54,275  
Foreign exchange effect (44,332) (10,969) 69,172
Balance, end of period (686,946) (622,234) (649,642)
Property, plant and equipment under construction      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period 950,680 1,762,648  
Balance, end of period 1,021,247 950,680 1,762,648
Other      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period 793,215 862,428  
Balance, end of period 697,981 793,215 862,428
Other | Accumulated depreciation      
PROPERTY, PLANT AND EQUIPMENT      
Balance, beginning of period (382,482) (496,816) (523,446)
Depreciation (130,611) (61,506) (100,259)
Transfers (23,733) 12,981 13,415
Disposals 7,970 43,067 31,589
Loss of control by selling of subsidiary   41,117 37,965
Transfer to assets held for sale 234,271 95,350  
Foreign exchange effect 4,454 (16,675) 43,920
Balance, end of period R$ (290,131) R$ (382,482) R$ (496,816)