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25. NET SALES (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
DisclosureOfNetSalesLineItems [Line Items]      
Gross sales R$ 45,910,424 R$ 39,004,511 R$ 35,613,367
Sales deductions (6,440,724) (5,557,531) (5,424,946)
Net sales 39,469,700 33,446,980 30,188,421
BRAZIL [member]      
DisclosureOfNetSalesLineItems [Line Items]      
Gross sales 26,017,981 21,645,253 20,659,378
Sales deductions (5,032,862) (4,155,774) (4,366,842)
Net sales 20,985,119 17,489,479 16,292,536
International [member]      
DisclosureOfNetSalesLineItems [Line Items]      
Gross sales 18,514,099 16,191,795 14,012,629
Sales deductions (1,273,905) (1,292,401) (943,958)
Net sales 17,240,194 14,899,394 13,068,671
Other [Member]      
DisclosureOfNetSalesLineItems [Line Items]      
Gross sales 1,378,344 1,167,463 941,360
Sales deductions (133,957) (109,356) (114,146)
Net sales R$ 1,244,387 R$ 1,058,107 R$ 827,214