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Fair value (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Derivatives assets, beginning balance R$ 55,251  
Derivatives assets, ending balance 92,439 R$ 55,251
Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance 2,118 339
Total gains or losses (realized / unrealized),Recognized in the result 286 (5)
Purchases 1,209 920
Settlements (585) (300)
Transfers in and / or out of Level (1,088) 1,164
Fair value, Ending balance 1,940 2,118
Total Gains or Losses (Unrealized) (994) (1,009)
Fair value assets, beginning balance 253 58
Total gains or losses (realized / unrealized),Recognized in the result 12 (19)
Total gains or losses (realized / unrealized),Recognized in the result 6 153
Purchases 504 51
Settlements (372) (8)
Transfers in and / or out of Level (185) 18
Fair value assets, ending balance 218 253
Derivatives assets, beginning balance 262 671
Total gains or losses (realized / unrealized), Recognized in the result 176 80
Purchases 235 157
Settlements (216) (104)
Transfers in and / or out of Level (85) (542)
Derivatives assets, ending balance 372 262
Derivatives assets, Total gains or losses (unrealized) 270 244
Derivatives liabilities, beginning balance (389) (569)
Total gains or losses (realized / unrealized), Recognized in the result (215) (74)
Purchases (306) (387)
Settlements 239 189
Transfers in and / or out of Level 496 452
Derivatives liabilities, ending balance (175) (389)
Derivatives liability, Total gains or losses (unrealized) 13 273
Level 3 of fair value hierarchy [member] | Swap contract [member]    
IfrsStatementLineItems [Line Items]    
Derivatives assets, beginning balance 236 631
Total gains or losses (realized / unrealized), Recognized in the result 164 108
Purchases 168 133
Settlements (169) (94)
Transfers in and / or out of Level (77) (542)
Derivatives assets, ending balance 322 236
Derivatives assets, Total gains or losses (unrealized) 271 240
Derivatives liabilities, beginning balance (372) (561)
Total gains or losses (realized / unrealized), Recognized in the result (233) (70)
Purchases (252) (369)
Settlements 216 176
Transfers in and / or out of Level 489 452
Derivatives liabilities, ending balance (152) (372)
Derivatives liability, Total gains or losses (unrealized) 6 274
Level 3 of fair value hierarchy [member] | Currency Options Contract [Member]    
IfrsStatementLineItems [Line Items]    
Derivatives assets, beginning balance 6 34
Total gains or losses (realized / unrealized), Recognized in the result 13 (32)
Purchases 67 14
Settlements (47) (10)
Transfers in and / or out of Level (8)  
Derivatives assets, ending balance 31 6
Derivatives assets, Total gains or losses (unrealized) (2) 1
Derivatives liabilities, beginning balance (1) (2)
Total gains or losses (realized / unrealized), Recognized in the result 17 (3)
Purchases (54) (9)
Settlements 23 13
Transfers in and / or out of Level 7  
Derivatives liabilities, ending balance (8) (1)
Derivatives liability, Total gains or losses (unrealized) 7 (1)
Level 3 of fair value hierarchy [member] | Currency Forward Contract [Member]    
IfrsStatementLineItems [Line Items]    
Derivatives assets, beginning balance 19 6
Total gains or losses (realized / unrealized), Recognized in the result (1) 3
Purchases   10
Derivatives assets, ending balance 18 19
Derivatives assets, Total gains or losses (unrealized)   3
Derivatives liabilities, beginning balance (16) (6)
Total gains or losses (realized / unrealized), Recognized in the result 1 (1)
Purchases   (9)
Derivatives liabilities, ending balance (15) (16)
Level 3 of fair value hierarchy [member] | Credit Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Derivatives assets, beginning balance 1  
Derivatives assets, ending balance 1 1
Derivatives assets, Total gains or losses (unrealized) 1  
Level 3 of fair value hierarchy [member] | Currency Credit Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Derivatives assets, beginning balance 1  
Total gains or losses (realized / unrealized), Recognized in the result   1
Derivatives assets, ending balance   1
Level 3 of fair value hierarchy [member] | Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance 2,118 339
Total gains or losses (realized / unrealized),Recognized in the result 286 (5)
Purchases 1,209 920
Settlements (585) (300)
Transfers in and / or out of Level (1,088) 1,164
Fair value, Ending balance 1,940 2,118
Total Gains or Losses (Unrealized) (994) (1,009)
Fair value assets, beginning balance 253 58
Total gains or losses (realized / unrealized),Recognized in the result 12 (19)
Total gains or losses (realized / unrealized),Recognized in the result 6 153
Purchases 504 51
Settlements (372) (8)
Transfers in and / or out of Level (185) 18
Fair value assets, ending balance 218 253
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Shares [Member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance 71 86
Total gains or losses (realized / unrealized),Recognized in the result 36 (14)
Purchases 3 9
Settlements (4) (10)
Fair value, Ending balance 106 71
Total Gains or Losses (Unrealized) (98) (100)
Fair value assets, beginning balance 193 45
Total gains or losses (realized / unrealized),Recognized in the result   (3)
Total gains or losses (realized / unrealized),Recognized in the result   151
Settlements (193)  
Fair value assets, ending balance   193
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Real Estate Receivables Certificates [member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance 126 151
Total gains or losses (realized / unrealized),Recognized in the result (27) (38)
Purchases 83 2
Settlements (95)  
Transfers in and / or out of Level 13 11
Fair value, Ending balance 100 126
Total Gains or Losses (Unrealized) (78) (64)
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Debentures [member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance 1,895 84
Total gains or losses (realized / unrealized),Recognized in the result 306 (36)
Purchases 950 740
Settlements (259) (67)
Transfers in and / or out of Level (1,158) 1,174
Fair value, Ending balance 1,734 1,895
Total Gains or Losses (Unrealized) (818) (845)
Total gains or losses (realized / unrealized),Recognized in the result 7  
Total gains or losses (realized / unrealized),Recognized in the result (1) (1)
Purchases 216 35
Settlements (144)  
Transfers in and / or out of Level 140 (34)
Fair value assets, ending balance 218  
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Promissory Note [Member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance 17  
Total gains or losses (realized / unrealized),Recognized in the result   (3)
Purchases   20
Transfers in and / or out of Level (17)  
Fair value, Ending balance   17
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Eurobonds And Others [Member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance 5 4
Total gains or losses (realized / unrealized),Recognized in the result (41) 84
Purchases 132 137
Settlements (87) (220)
Transfers in and / or out of Level (9)  
Fair value, Ending balance   5
Fair value assets, beginning balance 60  
Total gains or losses (realized / unrealized),Recognized in the result 5 (3)
Total gains or losses (realized / unrealized),Recognized in the result 7 3
Purchases 288 16
Settlements (35) (8)
Transfers in and / or out of Level (325) 52
Fair value assets, ending balance   60
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Financial Credit Bills [Member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance 4 7
Total gains or losses (realized / unrealized),Recognized in the result   (3)
Purchases   10
Settlements (4) (3)
Transfers in and / or out of Level   (7)
Fair value, Ending balance   4
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Other Securities [Member]    
IfrsStatementLineItems [Line Items]    
Total gains or losses (realized / unrealized),Recognized in the result 12  
Settlements (136)  
Transfers in and / or out of Level 83  
Purchases R$ 41  
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Rural Product Note [member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance   7
Total gains or losses (realized / unrealized),Recognized in the result   5
Purchases   2
Transfers in and / or out of Level   (14)
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Bank Deposit Certificates [member]    
IfrsStatementLineItems [Line Items]    
Fair value assets, beginning balance   13
Total gains or losses (realized / unrealized),Recognized in the result   R$ (13)