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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Reconciliation of debt to cash flows arising from financing activities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Loans and borrowings        
Loans and borrowings at beginning of the period     $ 13,360  
Additions $ 10   300 $ 5,000
Payments (179) $ (116) (1,412) $ (491)
Interest paid     (426)  
Cash flow from financing activities     (1,538)  
Effect of exchange rate     (7)  
Interest accretion     339  
Non-cash changes     332  
Loans and borrowings at end of the period 12,154   12,154  
Expenses with the redemption     63  
Quoted in the secondary market        
Loans and borrowings        
Loans and borrowings at beginning of the period     9,046  
Payments     (922)  
Interest paid     (279)  
Cash flow from financing activities     (1,201)  
Effect of exchange rate     (50)  
Interest accretion     222  
Non-cash changes     172  
Loans and borrowings at end of the period 8,017   8,017  
Debt contracts in Brazil        
Loans and borrowings        
Loans and borrowings at beginning of the period     959  
Payments     (269)  
Interest paid     (79)  
Cash flow from financing activities     (348)  
Effect of exchange rate     (153)  
Interest accretion     63  
Non-cash changes     (90)  
Loans and borrowings at end of the period 521   521  
Debt contracts in the international markets        
Loans and borrowings        
Loans and borrowings at beginning of the period     3,355  
Additions     300  
Payments     (221)  
Interest paid     (68)  
Cash flow from financing activities     11  
Effect of exchange rate     196  
Interest accretion     54  
Non-cash changes     250  
Loans and borrowings at end of the period $ 3,616   $ 3,616