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Financial risk management (Details 11)
$ in Millions
Dec. 31, 2024
USD ($)
Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic $ (40,915)
Dollar Per Real [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 65,900
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 (253,360)
Dollar Per Real [Member] | Exposure [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 408,073
Dollar Per Real [Member] | Exposure [Member] | Exchange Rate Cross Currency Swap [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (3,023)
Dollar Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1,291
Dollar Per Real [Member] | Probable Scenario [Member] | Cash flow hedges [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (2,078)
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 15
Dollar Per Real [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (8,184)
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 13,180
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 (611)
Euro Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (3,787)
Euro Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (6)
Euro Per Dollar [Member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (122)
Pound Sterling Per Dollar [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (907)
Pound Sterling Per Dollar [Member] | Exposure [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (5,618)
Pound Sterling Per Dollar [Member] | Probable Scenario [Member] | Non Deliverable Forward [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (12)
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 (181)
Pound Sterling Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (21)
Pound Sterling Per Real [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (126)
Pound Sterling Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 5
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 (10)
Currency risk [member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (42,454)
Currency risk [member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (262,891)
Currency risk [member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1,278
Currency risk [member] | Probable Stressed Scenario Of Twenty Five Percentage [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (8,497)
Derivatives Assets [Member] | Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 7,616
Derivatives Assets [Member] | Dollar Per Real [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 47,159
Derivatives Assets [Member] | Dollar Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (240)
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 1,523
Derivatives Assets [Member] | Euro Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 941
Derivatives Assets [Member] | Euro Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 5,824
Derivatives Assets [Member] | Euro Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 10
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 188
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 934
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 5,784
Derivatives Assets [Member] | Pound Sterling Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 12
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 187
Derivatives Assets [Member] | Pound Sterling Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 21
Derivatives Assets [Member] | Pound Sterling Per Real [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 131
Derivatives Assets [Member] | Pound Sterling Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 4
Derivatives Assets [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 (2)
Derivative Liabilities [Member] | Dollar Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (113,943)
Derivative Liabilities [Member] | Dollar Per Real [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (705,569)
Derivative Liabilities [Member] | Dollar Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 3,594
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 (22,789)
Derivative Liabilities [Member] | Euro Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (1,552)
Derivative Liabilities [Member] | Euro Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (9,611)
Derivative Liabilities [Member] | Euro Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (16)
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 (310)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (1,841)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (11,402)
Derivative Liabilities [Member] | Pound Sterling Per Dollar [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (24)
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 (368)
Derivative Liabilities [Member] | Pound Sterling Per Real [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (42)
Derivative Liabilities [Member] | Pound Sterling Per Real [Member] | Exposure [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic (257)
Derivative Liabilities [Member] | Pound Sterling Per Real [Member] | Probable Scenario [Member]  
IfrsStatementLineItems [Line Items]  
Adjustment in risk exposure associated with instruments sharing characteristic 1
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 $ (8)