v3.26.1
Stockholders' equity - Schedule of Change in Shares of Paid-in Capital in the Beginning and End of the Period (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Shares of capital stock (in shares) 11,026,869,192 9,804,135,348 9,804,135,348
Shares of capital stock R$ 136,910 R$ 90,729 R$ 90,729
(-) Cancellation of Shares - Meeting of the Board of Directors at 11/27/2025 (in shares) (78,850,638)    
Treasury shares, beginning balance (in shares) 28,030,833 436,671  
Treasury shares, beginning balance R$ (909) R$ (909) (11)
Acquisition of treasury shares (in shares) 81,312,040 54,000,000  
Acquisition of treasury shares R$ (3,085) R$ (1,775)  
(-) Cancellation of Shares - Meeting of the Board of Directors at 11/27/2025 (in shares) (78,850,638)    
(-) Cancellation of Shares - Meeting of the Board of Directors at 11/27/2025 R$ 3,000    
Result of delivery of treasury shares (in shares) (30,244,329) 26,405,838  
Result of delivery of treasury shares R$ 971 R$ 860 R$ 747
Treasury shares, ending balance (in shares) 344,662 28,030,833 436,671
Treasury shares, ending balance R$ (13) R$ (909) R$ (909)
Number of shares outstanding (in shares) 11,026,524,530 9,776,104,515 9,803,698,677
Bonus Share, Issuance One      
Bonus shares - Outstanding 980,413,535    
Bonus shares (in shares) 86,718    
Bonus Share, Issuance Two      
Bonus shares - Outstanding 321,170,947    
Bonus shares (in shares) 10,038    
Brazil      
Shares of capital stock (in shares) 6,901,088,548 6,243,973,086 6,431,313,028
Shares of capital stock R$ 85,684 R$ 57,783 R$ 59,516
Residents abroad      
Shares of capital stock (in shares) 4,125,780,644 3,560,162,262 3,372,822,320
Shares of capital stock R$ 51,226 R$ 32,946 R$ 31,213
Common      
Shares of capital stock (in shares) 5,617,742,977 4,958,290,359 4,958,290,359
Number of shares outstanding (in shares) 5,617,742,977 4,958,290,359 4,958,290,359
Common | Bonus Share, Issuance One      
Bonus shares - Outstanding 495,829,036    
Common | Bonus Share, Issuance Two      
Bonus shares - Outstanding 163,623,582    
Common | Brazil      
Shares of capital stock (in shares) 5,567,132,399 4,918,480,340 4,923,277,339
Common | Residents abroad      
Shares of capital stock (in shares) 50,610,578 39,810,019 35,013,020
Preferred      
Shares of capital stock (in shares) 5,409,126,215 4,845,844,989 4,845,844,989
(-) Cancellation of Shares - Meeting of the Board of Directors at 11/27/2025 (in shares) (78,850,638)    
Treasury shares, beginning balance (in shares) 28,030,833 436,671  
Acquisition of treasury shares (in shares) 81,312,040 54,000,000  
(-) Cancellation of Shares - Meeting of the Board of Directors at 11/27/2025 (in shares) (78,850,638)    
Result of delivery of treasury shares (in shares) (30,244,329) 26,405,838  
Result of delivery of treasury shares R$ 981 R$ 877  
Treasury shares, ending balance (in shares) 344,662 28,030,833 436,671
Number of shares outstanding (in shares) 5,408,781,553 4,817,814,156 4,845,408,318
Preferred | Bonus Share, Issuance One      
Bonus shares - Outstanding 484,584,499    
Bonus shares (in shares) 86,718    
Preferred | Bonus Share, Issuance Two      
Bonus shares - Outstanding 157,547,365    
Bonus shares (in shares) 10,038    
Preferred | Brazil      
Shares of capital stock (in shares) 1,333,956,149 1,325,492,746 1,508,035,689
Preferred | Residents abroad      
Shares of capital stock (in shares) 4,075,170,066 3,520,352,243 3,337,809,300