v3.26.1
FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Interest rate risk (Details) - Interest rate appreciation risk
R$ in Thousands
Dec. 31, 2025
BRL (R$)
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (109,834,719)
Scenario I - Likely  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) (8,208,203)
Scenario (25%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) (10,261,404)
Scenario (50%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) (12,314,596)
CDI (Interbank Deposit Certificate)  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities 0
Effect on profit/loss - revenue (expense) R$ (42,532,019)
Assumed interest rate 14.90%
CDI (Interbank Deposit Certificate) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (42,532,019)
CDI (Interbank Deposit Certificate) | Scenario I - Likely  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities 0
Effect on profit/loss - revenue (expense) R$ (5,167,640)
Assumed interest rate 12.15%
CDI (Interbank Deposit Certificate) | Scenario I - Likely | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (5,167,640)
CDI (Interbank Deposit Certificate) | Scenario (25%)  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities 0
Effect on profit/loss - revenue (expense) R$ (6,460,614)
Assumed interest rate 15.19%
CDI (Interbank Deposit Certificate) | Scenario (25%) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (6,460,614)
CDI (Interbank Deposit Certificate) | Scenario (50%)  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities 0
Effect on profit/loss - revenue (expense) R$ (7,753,587)
Assumed interest rate 18.23%
CDI (Interbank Deposit Certificate) | Scenario (50%) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (7,753,587)
SELIC (Special Settlement and Custody System)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ 54,774
Assumed interest rate 15.00%
SELIC (Special Settlement and Custody System) | Reimbursement rights  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets R$ 54,774
SELIC (Special Settlement and Custody System) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities 0
SELIC (Special Settlement and Custody System) | Scenario I - Likely  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ 6,710
Assumed interest rate 12.25%
SELIC (Special Settlement and Custody System) | Scenario I - Likely | Reimbursement rights  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets R$ 6,710
SELIC (Special Settlement and Custody System) | Scenario I - Likely | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities 0
SELIC (Special Settlement and Custody System) | Scenario (25%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ 8,386
Assumed interest rate 15.31%
SELIC (Special Settlement and Custody System) | Scenario (25%) | Reimbursement rights  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets R$ 8,386
SELIC (Special Settlement and Custody System) | Scenario (25%) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities 0
SELIC (Special Settlement and Custody System) | Scenario (50%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ 10,067
Assumed interest rate 18.38%
SELIC (Special Settlement and Custody System) | Scenario (50%) | Reimbursement rights  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets R$ 10,067
SELIC (Special Settlement and Custody System) | Scenario (50%) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities 0
TJLP (long-term interest rate)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (2,919,980)
Assumed interest rate 8.05%
TJLP (long-term interest rate) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (2,919,980)
TJLP (long-term interest rate) | Scenario I - Likely  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (264,842)
Assumed interest rate 9.07%
TJLP (long-term interest rate) | Scenario I - Likely | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (264,842)
TJLP (long-term interest rate) | Scenario (25%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (331,126)
Assumed interest rate 11.34%
TJLP (long-term interest rate) | Scenario (25%) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (331,126)
TJLP (long-term interest rate) | Scenario (50%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (397,409)
Assumed interest rate 13.61%
TJLP (long-term interest rate) | Scenario (50%) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (397,409)
IGPM  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (342,644)
Assumed interest rate (1.05%)
IGPM | Leases  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (342,644)
IGPM | Financing and loans receivable  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets 0
IGPM | Scenario I - Likely  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (13,534)
Assumed interest rate 3.95%
IGPM | Scenario I - Likely | Leases  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (13,534)
IGPM | Scenario I - Likely | Financing and loans receivable  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets 0
IGPM | Scenario (25%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (16,927)
Assumed interest rate 4.94%
IGPM | Scenario (25%) | Leases  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (16,927)
IGPM | Scenario (25%) | Financing and loans receivable  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets 0
IGPM | Scenario (50%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (20,319)
Assumed interest rate 5.93%
IGPM | Scenario (50%) | Leases  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (20,319)
IGPM | Scenario (50%) | Financing and loans receivable  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets 0
IPCA  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (64,094,850)
Assumed interest rate 4.32%
IPCA | Reimbursement rights  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets R$ 699,898
IPCA | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities (21,028,085)
IPCA | Obligations of Law No. 14,182/2021  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities (43,766,663)
IPCA | Scenario I - Likely  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (2,768,897)
Assumed interest rate 4.32%
IPCA | Scenario I - Likely | Reimbursement rights  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets R$ 30,236
IPCA | Scenario I - Likely | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities (908,413)
IPCA | Scenario I - Likely | Obligations of Law No. 14,182/2021  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities (1,890,720)
IPCA | Scenario (25%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (3,461,123)
Assumed interest rate 5.40%
IPCA | Scenario (25%) | Reimbursement rights  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets R$ 37,794
IPCA | Scenario (25%) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities (1,135,517)
IPCA | Scenario (25%) | Obligations of Law No. 14,182/2021  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities (2,363,400)
IPCA | Scenario (50%)  
Composition of balances in foreign currency and sensitivity analysis  
Effect on profit/loss - revenue (expense) R$ (4,153,347)
Assumed interest rate 6.48%
IPCA | Scenario (50%) | Reimbursement rights  
Composition of balances in foreign currency and sensitivity analysis  
Financial assets R$ 45,353
IPCA | Scenario (50%) | Loans, financing and debentures  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities (1,362,620)
IPCA | Scenario (50%) | Obligations of Law No. 14,182/2021  
Composition of balances in foreign currency and sensitivity analysis  
Financial liabilities R$ (2,836,080)