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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
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Loans and borrowings      
Loans and borrowings at beginning of the period $ 13,360    
Additions 930    
Repayments (1,927) $ (6,064) $ (5,417)
Interest paid 693    
Cash flow from financing activities (1,690)    
Effect of exchange rate (140)    
Interest accretion 650    
Non-cash changes 510    
Loans and borrowings at end of the period 12,180 13,360  
Expenses with the redemption 63   $ 265
Expenses with redemption of bonds 63    
Quoted in the secondary market      
Loans and borrowings      
Loans and borrowings at beginning of the period 9,046    
Additions 0    
Repayments (922)    
Interest paid 501    
Cash flow from financing activities (1,423)    
Effect of exchange rate (118)    
Interest accretion 469    
Non-cash changes 351    
Loans and borrowings at end of the period 7,974 9,046  
Debt contract in Brazil      
Loans and borrowings      
Loans and borrowings at beginning of the period 959    
Repayments (373)    
Interest paid 117    
Cash flow from financing activities (490)    
Effect of exchange rate (199)    
Interest accretion 110    
Non-cash changes (89)    
Loans and borrowings at end of the period 380 959  
Debt contracts in the international markets      
Loans and borrowings      
Loans and borrowings at beginning of the period 3,355    
Additions 930    
Repayments (632)    
Interest paid 75    
Cash flow from financing activities 223    
Effect of exchange rate 177    
Interest accretion 71    
Non-cash changes 248    
Loans and borrowings at end of the period $ 3,826 $ 3,355