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Financial and capital risk management - Protection programs for the R and EUR denominated debt instruments and other liabilities (Details)
R$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2023
BRL (R$)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
BRL (R$)
Brazilian Interbank Interest Rate Versus U S Fixed Rate Swap [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities $ 88   $ (83)  
Financial settlement inflows outflows (7)      
Value at risk 23      
Receivable $ 5,696   6,356  
Average receivable rate 100.13% 100.13%    
Payable $ 1,320   1,475  
Average payable rate 1.77% 1.77%    
Brazilian Interbank Interest Rate Versus U S Fixed Rate Swap [Member] | Not later than one year [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities $ 8      
Brazilian Interbank Interest Rate Versus U S Fixed Rate Swap [Member] | Later than one year and not later than two years [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 16      
Brazilian Interbank Interest Rate Versus U S Fixed Rate Swap [Member] | Later Than Two Year And There After [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 64      
Long Term Interest Rate Versus U S Fixed Rate Swap [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities (28)   (50)  
Financial settlement inflows outflows (1)      
Value at risk $ 3      
Receivable | R$   R$ 743   R$ 814
Average receivable rate 1.05% 1.05%    
Payable $ 186   204  
Average payable rate 3.45% 3.45%    
Long Term Interest Rate Versus U S Fixed Rate Swap [Member] | Not later than one year [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities $ (1)      
Long Term Interest Rate Versus U S Fixed Rate Swap [Member] | Later than one year and not later than two years [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities (3)      
Long Term Interest Rate Versus U S Fixed Rate Swap [Member] | Later Than Two Year And There After [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities (24)      
C D I And T J L P [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 60   (133)  
Financial settlement inflows outflows (8)      
Value at risk 26      
C D I And T J L P [Member] | Not later than one year [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 7      
C D I And T J L P [Member] | Later than one year and not later than two years [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 13      
C D I And T J L P [Member] | Later Than Two Year And There After [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 40      
Ndice Nacional De Preos Ao Consumidor Amplo Versus U S Fixed Rate Swap [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities (41)   (63)  
Financial settlement inflows outflows 3      
Value at risk $ 5      
Receivable | R$   R$ 1,186   1,294
Average receivable rate 4.54% 4.54%    
Payable $ 293   320  
Average payable rate 3.88% 3.88%    
Ndice Nacional De Preos Ao Consumidor Amplo Versus U S Fixed Rate Swap [Member] | Later than one year and not later than two years [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities $ (6)      
Ndice Nacional De Preos Ao Consumidor Amplo Versus U S Fixed Rate Swap [Member] | Later Than Two Year And There After [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities (35)      
I P C A [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities (41)   (63)  
Financial settlement inflows outflows 3      
Value at risk 5      
I P C A [Member] | Later than one year and not later than two years [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities (6)      
I P C A [Member] | Later Than Two Year And There After [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities (35)      
Brazilian Real Fixed Rate Versus U S Fixed Rate Swap [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 791   318  
Financial settlement inflows outflows 43      
Value at risk $ 64      
Receivable | R$   R$ 19,307   20,854
Average receivable rate 7.61% 7.61%    
Payable $ 3,665   3,948  
Average payable rate 0.00% 0.00%    
Brazilian Real Fixed Rate Versus U S Fixed Rate Swap [Member] | Later than one year and not later than two years [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities $ 291      
Brazilian Real Fixed Rate Versus U S Fixed Rate Swap [Member] | Later Than Two Year And There After [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 235      
Brazilian Real Fixed Rate Versus U S Fixed Rate Swap [Member] | Long Term Interest Rate Versus U S Fixed Rate Swap [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 265      
Forward contract [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 77   82  
Financial settlement inflows outflows 75      
Value at risk $ 6      
Payable | R$   R$ 2,186   R$ 4,342
Average payable rate 5.24% 5.24%    
Forward contract [member] | Later than one year and not later than two years [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities $ 34      
Forward contract [member] | Later Than Two Year And There After [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 10      
Forward contract [member] | Long Term Interest Rate Versus U S Fixed Rate Swap [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 33      
Brazilian Fixed Rate Versus U S Fixed Rate [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 868   $ 400  
Financial settlement inflows outflows 118      
Value at risk 70      
Brazilian Fixed Rate Versus U S Fixed Rate [Member] | Later than one year and not later than two years [member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 325      
Brazilian Fixed Rate Versus U S Fixed Rate [Member] | Later Than Two Year And There After [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities 245      
Brazilian Fixed Rate Versus U S Fixed Rate [Member] | Long Term Interest Rate Versus U S Fixed Rate Swap [Member]        
IfrsStatementLineItems [Line Items]        
Derivative financial liabilities $ 298