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22. EARNINGS (LOSS) PER SHARE (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Continued operations - Basic numerator      
Net earnings (loss) for the exercise attributable to controlling shareholders R$ 1,518,492 R$ 1,067,312 R$ (2,114,968)
Continued operations - Basic denominator      
Common shares 812,473,246 812,473,246 812,473,246
Weighted average number of outstanding shares - basic (except treasury shares) 809,110,872 811,539,167 811,294,251
Net earnings (loss) per share basic - R$ R$ 1.88 R$ 1.32 R$ (2.61)
Continued operations - Diluted numerator      
Net earnings (loss) for the exercise attributable to controlling shareholders R$ 1,518,492 R$ 1,067,312 R$ (2,114,968)
Continued operations - Diluted denominator      
Weighted average number of outstanding shares - basic (except treasury shares) 809,110,872 811,539,167 811,294,251
Number of potential shares [1] 2,237,936 2,327,952
Weighted average number of outstanding shares - diluted 811,348,808 813,867,119 811,294,251
Net earnings (loss) per share diluted - R$ R$ 1.87 R$ 1.31 R$ (2.61)
[1] Comprised of the restricted stocks under the share-based payment plans for which the payment is made in equity instruments.