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Risk management (Details 1) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Recognized In Net Finance Income Expense [Member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income $ (975) $ (1,271) $ (2,107) $ (2,513)
Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income (985) (1,440) (2,038) (2,735)
Commodity Derivatives [Member] | Fair value hedges [member] | Other Commodity Derivative Transactions [Member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income (10) (169) 69 (222)
Commodity Derivatives [Member] | Fair value hedges [member] | Recognized In Other Income And Expenses [Member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income (10) (169) 69 (222)
Currency Derivatives [Member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income 63 (148) 78 (9)
Currency Derivatives [Member] | Fair value hedges [member] | Swap Pounds Sterling [Member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income   (126)   (156)
Currency Derivatives [Member] | Fair value hedges [member] | Swap C D I X Dollar [Member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income 62 (22) 78 147
Interest Rate Derivatives [Member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income 40 (15) 47 (16)
Interest Rate Derivatives [Member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income 1      
Interest Rate Derivatives [Member] | Fair value hedges [member] | Swap C D I [Member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income 40 (15) 47 (16)
Cash flow hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income 4,482 (5,415) 7,104 7,561
Cash flow hedges [member] | Fair value hedges [member]        
IfrsStatementLineItems [Line Items]        
Gains/ (losses) recognized in the statement of income $ (1,078) $ (1,108) $ (2,232) $ (2,488)