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Fair value of financial instruments (Details 1) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Assets R$ 78,208 R$ 69,045  
Liabilities (76,861) (63,204)  
Swap contract [member]      
IfrsStatementLineItems [Line Items]      
Assets 46,902 38,014  
Liabilities (39,068) (34,646)  
Currency Options Contract [Member]      
IfrsStatementLineItems [Line Items]      
Assets 23,671 21,252  
Liabilities (29,882) (22,547)  
Forward contract [member]      
IfrsStatementLineItems [Line Items]      
Assets 601 3,111  
Liabilities (65) (762)  
Credit Derivatives Financial Institutions [Member]      
IfrsStatementLineItems [Line Items]      
Assets 492 242  
Liabilities (604) (198)  
Non Deliverable Forward [Member]      
IfrsStatementLineItems [Line Items]      
Assets 6,140    
Liabilities (6,626)    
0.1% increase in risk-free interest rates [Member]      
IfrsStatementLineItems [Line Items]      
Assets 402 483  
Liabilities (616) (155)  
Level 1 of fair value hierarchy [member]      
IfrsStatementLineItems [Line Items]      
Assets 29 6  
Liabilities (186) (3)  
Level 1 of fair value hierarchy [member] | Currency Options Contract [Member]      
IfrsStatementLineItems [Line Items]      
Assets   3  
Liabilities   (2)  
Level 1 of fair value hierarchy [member] | 0.1% increase in risk-free interest rates [Member]      
IfrsStatementLineItems [Line Items]      
Assets 29 3  
Liabilities (186) (1)  
Level 2 of fair value hierarchy [member]      
IfrsStatementLineItems [Line Items]      
Assets 77,508 68,887  
Liabilities (76,106) (63,076)  
Level 2 of fair value hierarchy [member] | Swap contract [member]      
IfrsStatementLineItems [Line Items]      
Assets 46,271 37,924  
Liabilities (38,507) (34,535)  
Level 2 of fair value hierarchy [member] | Currency Options Contract [Member]      
IfrsStatementLineItems [Line Items]      
Assets 23,637 21,187  
Liabilities (29,880) (22,531)  
Level 2 of fair value hierarchy [member] | Forward contract [member]      
IfrsStatementLineItems [Line Items]      
Assets 595 3,111  
Liabilities (65) (762)  
Level 2 of fair value hierarchy [member] | Credit Derivatives Financial Institutions [Member]      
IfrsStatementLineItems [Line Items]      
Assets 492 242  
Liabilities (604) (198)  
Level 2 of fair value hierarchy [member] | Non Deliverable Forward [Member]      
IfrsStatementLineItems [Line Items]      
Assets 6,140 5,943  
Liabilities (6,626) (4,896)  
Level 2 of fair value hierarchy [member] | 0.1% increase in risk-free interest rates [Member]      
IfrsStatementLineItems [Line Items]      
Assets 373 480  
Liabilities (424) (154)  
Level 3 of fair value hierarchy [member]      
IfrsStatementLineItems [Line Items]      
Assets 671 152 R$ 105
Liabilities (569) (125) R$ (110)
Level 3 of fair value hierarchy [member] | Swap contract [member]      
IfrsStatementLineItems [Line Items]      
Assets 631 90  
Liabilities (561) (111)  
Level 3 of fair value hierarchy [member] | Currency Options Contract [Member]      
IfrsStatementLineItems [Line Items]      
Assets 34 62  
Liabilities (2) R$ (14)  
Level 3 of fair value hierarchy [member] | Forward contract [member]      
IfrsStatementLineItems [Line Items]      
Assets 6    
Level 3 of fair value hierarchy [member] | 0.1% increase in risk-free interest rates [Member]      
IfrsStatementLineItems [Line Items]      
Liabilities R$ (6)