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Financial risk management (Details 11)
$ in Millions
Jun. 30, 2024
USD ($)
Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic $ (33,920)
Dollar Per Real [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 62,660
Dollar Per Real [Member] | Exchange Rate Cross Currency Swap [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (541)
Dollar Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 2,434
Dollar Per Real [Member] | Probable Scenario [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (4,496)
Dollar Per Real [Member] | Probable Scenario [Member] | Exchange Rate Cross Currency Swap [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 39
Dollar Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (6,783)
Dollar Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 12,532
Dollar Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member] | Exchange Rate Cross Currency Swap [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (108)
Dollar Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (13,567)
Dollar Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 25,064
Dollar Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member] | Exchange Rate Cross Currency Swap [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (216)
Euro Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (574)
Euro Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (15)
Euro Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (114)
Euro Per Dollar [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (230)
Pound Sterling Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (36,032)
Pound Sterling Per Dollar [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (1,505)
Pound Sterling Per Dollar [Member] | Probable Scenario [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (29)
Pound Sterling Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (301)
Pound Sterling Per Dollar [Member] | Probable Stressed Scenario Of Fifty Percentage [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (602)
Pound Sterling Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (35)
Pound Sterling Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 2
Pound Sterling Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (7)
Pound Sterling Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (14)
Euro Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (13)
Euro Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1
Euro Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2)
Euro Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (5)
Peso Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (5)
Peso Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2)
Peso Per Dollar [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (4)
Currency risk [member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 2,388
Currency risk [member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (7,209)
Currency risk [member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (14,422)
Derivatives Assets [Member] | Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 11,548
Derivatives Assets [Member] | Dollar Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (829)
Derivatives Assets [Member] | Dollar Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 2,310
Derivatives Assets [Member] | Dollar Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 4,619
Derivatives Assets [Member] | Euro Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1,489
Derivatives Assets [Member] | Euro Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 37
Derivatives Assets [Member] | Euro Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 298
Derivatives Assets [Member] | Euro Per Dollar [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 595
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1,555
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 30
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 311
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 622
Derivatives Assets [Member] | Pound Sterling Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1
Derivatives Assets [Member] | Euro Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 4
Derivatives Assets [Member] | Euro Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1
Derivatives Assets [Member] | Euro Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 2
Derivatives Assets [Member] | Peso Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 15
Derivatives Assets [Member] | Peso Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2)
Derivatives Assets [Member] | Peso Per Dollar [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (4)
Derivative Liabilities [Member] | Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (107,587)
Derivative Liabilities [Member] | Dollar Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 7,720
Derivative Liabilities [Member] | Dollar Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (21,517)
Derivative Liabilities [Member] | Dollar Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (43,034)
Derivative Liabilities [Member] | Euro Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2,063)
Derivative Liabilities [Member] | Euro Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (52)
Derivative Liabilities [Member] | Euro Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (412)
Derivative Liabilities [Member] | Euro Per Dollar [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (825)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (3,060)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (59)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (612)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (1,224)
Derivative Liabilities [Member] | Pound Sterling Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (36)
Derivative Liabilities [Member] | Pound Sterling Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 2
Derivative Liabilities [Member] | Pound Sterling Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (7)
Derivative Liabilities [Member] | Pound Sterling Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (14)
Derivative Liabilities [Member] | Euro Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1
Derivative Liabilities [Member] | Euro Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (3)
Derivative Liabilities [Member] | Euro Per Real [Member] | Probable Stressed Scenario Of Fifty Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (7)
Derivative Liabilities [Member] | Peso Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (5)
Euro Per Real [Member] | Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (17)
Peso Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic $ 15