v3.25.4
Financial instruments - Risk Rating (Details) - Credit risk [member] - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures R$ 9,571,661 R$ 3,887,100
Derivative financial instruments | AAA    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 232,908
Derivative financial instruments | AA-    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 476,535 286,906
Derivative financial instruments | A+    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 94,638 148,029
Derivative financial instruments | A Member    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 6,146
Derivative financial instruments | brAAA    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 8,870,122 2,747,948
Derivative financial instruments | brAA+    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures  
Derivative financial instruments | brAA- memberr    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 9,246  
Derivative financial instruments | brBB- member    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 156,450
Derivative financial instruments | Other risk ratings    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 114,974 314,859
Cash and cash equivalents and marketable securities    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 25,432,207 22,382,329
Cash and cash equivalents and marketable securities | A+    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 9,055  
Cash and cash equivalents and marketable securities | A-    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 37,081  
Cash and cash equivalents and marketable securities | brAAA    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 24,984,803 20,830,651
Cash and cash equivalents and marketable securities | brAA+    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 576 658,880
Cash and cash equivalents and marketable securities | brAA member    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 473 755
Cash and cash equivalents and marketable securities | brAA- memberr    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 252,945 19
Cash and cash equivalents and marketable securities | brA    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 117,736 31,504
Cash and cash equivalents and marketable securities | brBBB-    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 3
Cash and cash equivalents and marketable securities | brBB    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 710
Cash and cash equivalents and marketable securities | brBB- member    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures 17 750,359
Cash and cash equivalents and marketable securities | Other risk ratings    
Disclosure of detailed information about financial instruments [line items]    
Rated Credit Exposures R$ 29,521 R$ 109,448