v3.26.1
Stockholders' equity - Schedule of Stockholders Compensation (Details) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of fair value measurement of liabilities [line items]      
Paid / prepaid, value R$ 29,556 R$ 6,729 R$ 7,079
Paid / prepaid (1,434) (1,009) (1,061)
Paid / prepaid, Net 28,122 5,720 6,018
Interest on capital, WHT   (489) 0
Accrued (Recorded in Other Liabilities), value 4,148 5,886 5,236
Accrued (Recorded in Other Liabilities) (623) (882) (786)
Current dividend payables 3,525 5,004 4,450
Identified in revenue reserves in stockholders equity, value   15,489 11,000
Identified in revenue reserves in stockholders equity, Net   R$ 15,000 R$ 11,000
Interest on capital, Gross value per share (in brl per share)   R$ 0.2834  
Interest on capital, value   R$ 3,260  
Interest on capital, WHT   (489)  
Interest on capital, Net   R$ 2,771  
Dividends, Gross value per share (in brl per share)   R$ 1.2509 R$ 1.1251
Dividends, value   R$ 12,229 R$ 11,000
Dividends, Net   12,229 11,000
Total, value 33,704 28,104 23,315
Total, WHT (2,057) (2,380) (1,847)
Total, Net R$ 31,647 R$ 25,724 R$ 21,468
Interest On Capital One      
Disclosure of fair value measurement of liabilities [line items]      
Interest on capital - 1 monthly installment, gross value per share (in brl per share) R$ 0.0150 R$ 0.0150 R$ 0.0150
Interest on capital - 1 monthly installment, value R$ 2,038 R$ 1,901 R$ 1,902
Interest on capital - 1 monthly installment, WHT (307) (285) (285)
Interest on capital - 1 monthly installment, Net R$ 1,731 R$ 1,616 R$ 1,617
Interest On Capital Two      
Disclosure of fair value measurement of liabilities [line items]      
Interest on capital, gross value per share (in brl per share) R$ 0.5929 R$ 0.2055 R$ 0.2227
Interest on capital-paid, value R$ 7,518 R$ 2,370 R$ 2,567
Interest on capital, WHT (1,127) (356) (385)
Interest on capital, Net R$ 6,391 R$ 2,014 R$ 2,182
Interest On Capital Three      
Disclosure of fair value measurement of liabilities [line items]      
Interest on capital, gross value per share (in brl per share) R$ 1.8682 R$ 0.2134 R$ 0.2264
Interest on capital-paid, value     R$ 2,610
Interest on capital, WHT R$ 0 R$ (368) (391)
Interest on capital, Net 20,000 2,090 R$ 2,219
Interest on capital, value R$ 20,000 R$ 2,458  
Interest On Capital Four      
Disclosure of fair value measurement of liabilities [line items]      
Interest on capital - 1 monthly installment, gross value per share (in brl per share) R$ 0.0150 R$ 0.0150 R$ 0.0150
Interest on capital - 1 monthly installment, value R$ 190 R$ 173 R$ 173
Interest on capital - 1 monthly installment, WHT (29) (26) (26)
Interest on capital - 1 monthly installment, Net 161 147 147
Interest On Capital Credited      
Disclosure of fair value measurement of liabilities [line items]      
Interest on capital-paid, value 3,958 2,673 2,639
Interest on capital, WHT (594) (400) (396)
Interest on capital, Net R$ 3,364 R$ 2,273 R$ 2,243
Interest on capital, gross value per share (in brl per share) R$ 0.3143 R$ 0.2320 R$ 0.2289
Interest On Capital Credited 1      
Disclosure of fair value measurement of liabilities [line items]      
Interest on capital-paid, value   R$ 3,040 R$ 2,424
Interest on capital, WHT   (456) (364)
Interest on capital, Net   R$ 2,584 R$ 2,060
Interest on capital, gross value per share (in brl per share)   R$ 0.2640 R$ 0.2102