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Financial and capital risk management (Details 12) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Cash And Cash Equivalents Current [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure $ 5,006 $ 3,660
Cash And Cash Equivalents Current [Member] | Aa 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 391 338
Cash And Cash Equivalents Current [Member] | Aa 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure   42
Cash And Cash Equivalents Current [Member] | A 1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 1,874 2,022
Cash And Cash Equivalents Current [Member] | A 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 520 309
Cash And Cash Equivalents Current [Member] | A 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 709 186
Cash And Cash Equivalents Current [Member] | Baa 1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 1 2
Cash And Cash Equivalents Current [Member] | Baa 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 4 16
Cash And Cash Equivalents Current [Member] | Ba 1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 719 85
Cash And Cash Equivalents Current [Member] | Ba 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 788 287
Cash And Cash Equivalents Current [Member] | Ba 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure   373
Derivatives [member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 68 815
Derivatives [member] | Aa 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 1
Derivatives [member] | A 1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 28 50
Derivatives [member] | A 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 13 293
Derivatives [member] | A 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 2 22
Derivatives [member] | Ba 1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 18  
Derivatives [member] | Ba 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure $ 6 314
Derivatives [member] | Ba 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure   $ 136