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Financial and capital risk management (Details 15) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Cash And Cash Equivalents Current [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure $ 6,540 $ 3,660
Cash And Cash Equivalents Current [Member] | Moody's, Aa2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 706 338
Cash And Cash Equivalents Current [Member] | Moody's, Aa3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure   42
Cash And Cash Equivalents Current [Member] | Moody's, A1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 2,587 2,022
Cash And Cash Equivalents Current [Member] | Moody's, A2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 608 309
Cash And Cash Equivalents Current [Member] | Moody's, A3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 1,146 186
Cash And Cash Equivalents Current [Member] | Moody's, Baa1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure   2
Cash And Cash Equivalents Current [Member] | Moody's, Baa2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 20 16
Cash And Cash Equivalents Current [Member] | Moody's, Ba1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 100 85
Cash And Cash Equivalents Current [Member] | Moody's, Ba2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 782 287
Cash And Cash Equivalents Current [Member] | Moody's, Ba3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 591 373
Derivatives [member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 277 815
Derivatives [member] | Moody's, Aa2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 1  
Derivatives [member] | Moody's, Aa3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 1  
Derivatives [member] | Moody's, A1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 26 50
Derivatives [member] | Moody's, A2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 104 293
Derivatives [member] | Moody's, A3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 3 22
Derivatives [member] | Moody's, Ba2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 99 314
Derivatives [member] | Moody's, Ba3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure $ 43 $ 136