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Financial risk management (Details 14) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents $ 3,271 $ 12,727
Marketable securities 4,845 5,228
Investment Grade Global Rating [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 1,413 7,503
Marketable securities 1,875 1,115
AA Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 315 593
Marketable securities 876 651
A Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 1,098 6,890
Marketable securities 999 464
BBB Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents   20
Other Ratings Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 215 3,251
Marketable securities 1,026  
Investment Grade Local Rating Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 1,642 1,966
Marketable securities 1,944 4,113
AAA.br [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 1,642 1,966
Marketable securities 1,944 4,113
Other Ratings In Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents $ 1 $ 7