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Financial risk management (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income $ (663) $ (985) $ (1,376) $ (2,038)
Recognized In Net Finance Income Expense [Member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income (682) (975) (1,400) (2,107)
Commodity Derivatives [Member] | Other Commodity Derivative Transactions [Member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income 19 (10) 24 69
Commodity Derivatives [Member] | Recognized In Other Income And Expenses [Member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income 19 (10) 24 69
Currency Derivatives [Member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income (61) 63 (62) 78
Currency Derivatives [Member] | Swap C D I X Dollar [Member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income (61) 62 (62) 78
Interest Rate Derivatives [Member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income (21) 40 (41) 47
Interest Rate Derivatives [Member] | Other [Member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income   1    
Interest Rate Derivatives [Member] | Swap C D I [Member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income (21) 40 (41) 47
Cash flow hedges [member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income $ (600) $ (1,078) $ (1,297) $ (2,232)