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Financial assets and liabilities - Hierarchy of fair value (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Financial assets $ 3,701 $ 4,387
Financial liabilities 2,673 3,104
Derivatives [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities 145 276
Participative Stockholders Debentures Noncurrent [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities 2,528 2,725
Financial Guarantees [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities   103
Shorts Term Investments [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets 46 61
Derivatives [member]    
IfrsStatementLineItems [Line Items]    
Financial assets 1,081 538
Accounts Receivable Current [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets 2,543 3,781
Investments In Equity Securities Noncurrent [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets 31 7
Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets 46 61
Level 1 of fair value hierarchy [member] | Shorts Term Investments [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets 46 61
Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets 3,655 4,326
Financial liabilities 2,673 3,104
Level 2 of fair value hierarchy [member] | Derivatives [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities 145 276
Level 2 of fair value hierarchy [member] | Participative Stockholders Debentures Noncurrent [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities 2,528 2,725
Level 2 of fair value hierarchy [member] | Financial Guarantees [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities   103
Level 2 of fair value hierarchy [member] | Derivatives [member]    
IfrsStatementLineItems [Line Items]    
Financial assets 1,081 538
Level 2 of fair value hierarchy [member] | Accounts Receivable Current [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets 2,543 3,781
Level 2 of fair value hierarchy [member] | Investments In Equity Securities Noncurrent [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets $ 31 $ 7