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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Fair value hierarchy (Details) - At fair value [member] - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets R$ 35,999,928 R$ 27,496,594
Liabilities 2,436,072 4,846,795
Level 2 of fair value hierarchy [member]    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 17,697,740 12,839,491
Liabilities 2,436,072 4,846,795
Level 3 of fair value hierarchy [member]    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 18,302,188 14,657,103
At fair value through profit or loss    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Liabilities 2,436,072 4,846,795
At fair value through profit or loss | Derivative financial instruments    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Liabilities 2,436,072 4,846,795
At fair value through profit or loss | Level 2 of fair value hierarchy [member]    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Liabilities 2,436,072 4,846,795
At fair value through profit or loss | Level 2 of fair value hierarchy [member] | Derivative financial instruments    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Liabilities 2,436,072 4,846,795
At fair value through profit or loss    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 17,697,740 12,839,491
At fair value through profit or loss | Derivative financial instruments    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 4,430,454 4,873,749
At fair value through profit or loss | Marketable securities    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 13,267,286 7,965,742
At fair value through profit or loss | Level 2 of fair value hierarchy [member]    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 17,697,740 12,839,491
At fair value through profit or loss | Level 2 of fair value hierarchy [member] | Derivative financial instruments    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 4,430,454 4,873,749
At fair value through profit or loss | Level 2 of fair value hierarchy [member] | Marketable securities    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 13,267,286 7,965,742
At fair value through other comprehensive income    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 23,606 24,917
At fair value through other comprehensive income | Other investments - CelluForce    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 23,606 24,917
At fair value through other comprehensive income | Level 3 of fair value hierarchy [member]    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 23,606 24,917
At fair value through other comprehensive income | Level 3 of fair value hierarchy [member] | Other investments - CelluForce    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 23,606 24,917
Amortized cost    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 18,278,582 14,632,186
Amortized cost | Biological assets [member]    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 18,278,582 14,632,186
Amortized cost | Level 3 of fair value hierarchy [member]    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets 18,278,582 14,632,186
Amortized cost | Level 3 of fair value hierarchy [member] | Biological assets [member]    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Assets R$ 18,278,582 R$ 14,632,186