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Cash and cash equivalents and marketable securities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Cash at bank and in hand $ 255 $ 136
Total short-term financial investments 6,741 3,135
Total cash and cash equivalents 6,996 3,271
Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Short-term financial investments 2,353 1,639
Foreign Countries [Member]    
IfrsStatementLineItems [Line Items]    
Short-term financial investments 4,388 1,496
Brazilian Interbank Deposit Rateiinvestment Funds And Other Short Term Deposits [Member] | Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Short-term financial investments 2,191 1,453
Bank Deposit Certificates And Other Investment Funds [Member] | Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Short-term financial investments 162 186
Time Deposits [Member] | Foreign Countries [Member]    
IfrsStatementLineItems [Line Items]    
Short-term financial investments 2,708 728
Sweep Accounts And Interest Bearing Accounts [Member] | Foreign Countries [Member]    
IfrsStatementLineItems [Line Items]    
Short-term financial investments 1,660 726
Other Financial Investments [Member] | Foreign Countries [Member]    
IfrsStatementLineItems [Line Items]    
Short-term financial investments $ 20 $ 42