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Financial risk management (Details 11)
$ in Millions
Jun. 30, 2025
USD ($)
Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic $ (41,335)
Dollar Per Real [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 70,052
Dollar Per Real [Member] | Exchange Rate Cross Currency Swap [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (488)
Dollar Per Real [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (225,576)
Dollar Per Real [Member] | Exposure [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 382,279
Dollar Per Real [Member] | Exposure [Member] | Exchange Rate Cross Currency Swap [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2,664)
Dollar Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2,252)
Dollar Per Real [Member] | Probable Scenario [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 3,815
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 (27)
Dollar Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (8,268)
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 14,010
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 (98)
Euro Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (538)
Euro Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2,939)
Euro Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (9)
Euro Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (108)
Pound Sterling Per Dollar [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (989)
Pound Sterling Per Dollar [Member] | Exposure [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (5,395)
Pound Sterling Per Dollar [Member] | Probable Scenario [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (5)
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 (197)
Renminbi Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (487)
Renminbi Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2,658)
Renminbi Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (4)
Renminbi Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (97)
Others [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (23)
Others [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (129)
Others [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 6
Others [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (22)
Currency risk [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (43,372)
Currency risk [member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (236,697)
Currency risk [member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2,264)
Currency risk [member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (8,692)
Derivatives Assets [Member] | Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 4,425
Derivatives Assets [Member] | Dollar Per Real [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 24,145
Derivatives Assets [Member] | Dollar Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 241
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 885
Derivatives Assets [Member] | Euro Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1,186
Derivatives Assets [Member] | Euro Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 6,470
Derivatives Assets [Member] | Euro Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 18
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 237
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1,018
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 5,555
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 6
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 204
Derivatives Assets [Member] | Renminbi Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1
Derivatives Assets [Member] | Renminbi Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 3
Derivatives Assets [Member] | Others [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 44
Derivatives Assets [Member] | Others [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 239
Derivatives Assets [Member] | Others [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 10
Derivatives Assets [Member] | Others [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (8)
Derivative Liabilities [Member] | Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (115,324)
Derivative Liabilities [Member] | Dollar Per Real [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (629,336)
Derivative Liabilities [Member] | Dollar Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (6,281)
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 (23,065)
Derivative Liabilities [Member] | Euro Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (1,724)
Derivative Liabilities [Member] | Euro Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (9,409)
Derivative Liabilities [Member] | Euro Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (27)
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 (345)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2,007)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (10,950)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (11)
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 (401)
Derivative Liabilities [Member] | Renminbi Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (488)
Derivative Liabilities [Member] | Renminbi Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2,661)
Derivative Liabilities [Member] | Renminbi Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (4)
Derivative Liabilities [Member] | Renminbi Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (97)
Derivative Liabilities [Member] | Others [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (67)
Derivative Liabilities [Member] | Others [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (368)
Derivative Liabilities [Member] | Others [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (4)
Derivative Liabilities [Member] | Others [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic $ (14)