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Fair value of financial instruments (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
At Fair Value Through Profit or Loss R$ 464,682 R$ 434,169
Fair value, Beginning balance 69,045  
Fair value, Ending balance 78,208 69,045
Fair value, Beginning balance (63,204)  
Fair value, Ending balance (76,861) (63,204)
Fair value, Ending balance (76,861) (63,204)
Fair value, Ending balance 464,682 434,169
Swap contract [member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance (34,646)  
Fair value, Ending balance (39,068) (34,646)
Fair value, Ending balance (39,068) (34,646)
Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance (762)  
Fair value, Ending balance (65) (762)
Fair value, Ending balance (65) (762)
Other Derivative Financial Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance (5,249)  
Fair value, Ending balance (7,846) (5,249)
Fair value, Ending balance (7,846) (5,249)
Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance 1,563  
Total gains or losses (realized / unrealized),Recognized in the result 46 (505)
Purchases 143 1,993
Settlements (49) (865)
Transfers in and / or out of Level (1,324) (1,028)
At Fair Value Through Profit or Loss 379 1,563
Total Gains or Losses (Unrealized) (98) (434)
Purchases   47
Total gains or losses (realized / unrealized), Recognized in the result   (2)
Transfers in and / or out of Level   13
Fair value, Ending balance 58  
Fair value, Beginning balance 152 105
Total gains or losses (realized / unrealized), Recognized in the result 178 46
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 64  
Purchases 234 327
Settlements (552) (284)
Transfers in and / or out of Level 595 (42)
Fair value, Ending balance 671 152
Total Gains or Losses (Unrealized) 588 56
Fair value, Beginning balance (125) (110)
Total gains or losses (realized / unrealized), Recognized in the result 48 (72)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income (132)  
Purchases (85) (233)
Settlements 38 148
Transfers in and / or out of Level (313) (2)
Fair value, Ending balance (569) (125)
Total Gains or Losses (Unrealized) (349) (24)
Total gains or losses (realized / unrealized), Recognized in the result (48) 72
Fair value, Ending balance (569) (125)
Fair value, Beginning balance   1,968
Fair value, Ending balance 379 1,563
Level 3 of fair value hierarchy [member] | Swap contract [member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance 90 93
Total gains or losses (realized / unrealized), Recognized in the result 151 26
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 64  
Purchases   56
Settlements (73) (43)
Transfers in and / or out of Level 399 (42)
Fair value, Ending balance 631 90
Total Gains or Losses (Unrealized) 608 90
Fair value, Beginning balance (111) (109)
Total gains or losses (realized / unrealized), Recognized in the result 25 (8)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income (132)  
Purchases   (30)
Settlements 21 22
Transfers in and / or out of Level (314) (2)
Fair value, Ending balance (561) (111)
Total Gains or Losses (Unrealized) (350) (46)
Total gains or losses (realized / unrealized), Recognized in the result (25) 8
Fair value, Ending balance (561) (111)
Level 3 of fair value hierarchy [member] | Currency Options Contract [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance 62 12
Total gains or losses (realized / unrealized), Recognized in the result 27 20
Purchases 228 271
Settlements (479) (241)
Transfers in and / or out of Level 196  
Fair value, Ending balance 34 62
Total Gains or Losses (Unrealized) (20) (34)
Fair value, Beginning balance (14) (1)
Total gains or losses (realized / unrealized), Recognized in the result (73) (64)
Purchases (79) (203)
Settlements 17 126
Transfers in and / or out of Level 1  
Fair value, Ending balance (2) (14)
Total Gains or Losses (Unrealized) 1 22
Total gains or losses (realized / unrealized), Recognized in the result 73 64
Fair value, Ending balance (2) (14)
Level 3 of fair value hierarchy [member] | Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Purchases 6  
Fair value, Ending balance 6  
Level 3 of fair value hierarchy [member] | Other Derivative Financial Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Purchases (6)  
Fair value, Ending balance (6)  
Fair value, Ending balance (6)  
Level 3 of fair value hierarchy [member] | Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance 1,563  
Total gains or losses (realized / unrealized),Recognized in the result 21 (505)
Purchases 128 47
Settlements (49) (865)
Transfers in and / or out of Level (1,324) (1,028)
At Fair Value Through Profit or Loss 339 1,563
Total Gains or Losses (Unrealized) (138) (434)
Total gains or losses (realized / unrealized), Recognized in the result   (2)
Fair value, Ending balance 58  
Fair value, Beginning balance   1,968
Fair value, Ending balance 339 1,563
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Shares [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance  
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Real Estate Receivables Certificates [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance 3  
Total gains or losses (realized / unrealized),Recognized in the result (36) (167)
Purchases 2 1,039
Settlements (2) (616)
Transfers in and / or out of Level 184 (801)
At Fair Value Through Profit or Loss 151 3
Total Gains or Losses (Unrealized) (60)  
Fair value, Beginning balance   548
Fair value, Ending balance 151 3
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Debentures [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance 1,478  
Total gains or losses (realized / unrealized),Recognized in the result 109 (313)
Purchases 96 855
Settlements (211)
Transfers in and / or out of Level (1,599) (203)
At Fair Value Through Profit or Loss 84 1,478
Total Gains or Losses (Unrealized) (7) (432)
Fair value, Beginning balance   1,350
Fair value, Ending balance 84 1,478
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Rural Product Note [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance 61 64
Total gains or losses (realized / unrealized),Recognized in the result 3 (15)
Purchases   62
At Fair Value Through Profit or Loss 7 61
Total Gains or Losses (Unrealized) (9)  
Settlements (1) (32)
Transfers in and / or out of Level (56) (18)
Fair value, Ending balance 7 61
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Eurobonds and others [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance 8  
Total gains or losses (realized / unrealized),Recognized in the result (1) (9)
Purchases 11 23
Settlements (14) (6)
At Fair Value Through Profit or Loss 4 8
Total Gains or Losses (Unrealized)   (2)
Fair value, Ending balance 4 8
Level 3 of fair value hierarchy [member] | Corporate Securities [Member] | Financial credit bills [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Beginning balance 13 6
Total gains or losses (realized / unrealized),Recognized in the result   (1)
Purchases 19 14
Settlements (32)  
Transfers in and / or out of Level 7  
At Fair Value Through Profit or Loss 7 13
Transfers in and / or out of Level   (6)
Fair value, Ending balance 7 13
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   25
At Fair Value Through Profit or Loss 40  
Total Gains or Losses (Unrealized) 40  
Purchases   15
Fair value, Ending balance 40  
Level 3 of fair value hierarchy [member] | Shares [Member]    
IfrsStatementLineItems [Line Items]    
Total gains or losses (realized / unrealized),Recognized in the result (54)  
Purchases   47
Transfers in and / or out of Level 140  
At Fair Value Through Profit or Loss 86  
Total Gains or Losses (Unrealized) (62)  
Total gains or losses (realized / unrealized), Recognized in the result   (2)
Fair value, Ending balance 86  
Level 3 of fair value hierarchy [member] | Corporate Securitie [Member]    
IfrsStatementLineItems [Line Items]    
Purchases   1,993
Transfers in and / or out of Level   R$ 13
Level 3 of fair value hierarchy [member] | Corporate Securities Shares [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Ending balance 45  
Level 3 of fair value hierarchy [member] | Bank Deposit Certificates [Member]    
IfrsStatementLineItems [Line Items]    
Fair value, Ending balance R$ 13