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Balance by type of finance debt (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings $ 31,051 $ 35,700
Finance debt, current 4,116 3,641
Non-current portion of non-current borrowings 26,935 32,059
BRAZIL    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings 4,818 4,517
Foreign countries [member]    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings 26,233 31,183
Banking Market [Member] | BRAZIL    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings 1,242 1,237
Banking Market [Member] | Foreign countries [member]    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings 7,916 8,525
Capital Market [Member] | BRAZIL    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings 2,800 2,504
Capital Market [Member] | Foreign countries [member]    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings 15,461 19,527
Development Banks [Member] | BRAZIL    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings 770 769
Development Banks [Member] | Foreign countries [member]    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings 2,688 2,951
Other Debt [Member] | BRAZIL    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings 6 7
Other Debt [Member] | Foreign countries [member]    
DisclosureFinanceDebtLineItems [Line Items]    
Borrowings $ 168 $ 180