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Cash flows reconciliation - Reconciliation of debt to cash flow (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Liabilities arising from financing activities $ 12,180 $ 1,336  
Additions 1,275 930  
Payments (2,300) (1,927) $ (6,064)
Interest paid (785) (693)  
Cash flow from financing activities (1,810) (1,690)  
Effect of exchange rate 78 (140)  
Interest accretion 733 650  
Non-cash changes 811 510  
Liabilities arising from financing activities 11,181 12,180 1,336
Quoted In Secondary Market [Member]      
IfrsStatementLineItems [Line Items]      
Liabilities arising from financing activities 7,974 9,046  
Payments (1,441) (922)  
Interest paid (650) (501)  
Cash flow from financing activities (2,091) (1,423)  
Effect of exchange rate 126 (118)  
Interest accretion 488 469  
Non-cash changes 614 351  
Liabilities arising from financing activities 6,497 7,974 9,046
Debt Contract Brazil [Member]      
IfrsStatementLineItems [Line Items]      
Liabilities arising from financing activities 380 959  
Payments (220) (373)  
Interest paid (45) (117)  
Cash flow from financing activities (265) (490)  
Effect of exchange rate 7 (199)  
Interest accretion 158 110  
Non-cash changes 165 (89)  
Liabilities arising from financing activities 280 380 959
Debt Contracts International Markets [Member]      
IfrsStatementLineItems [Line Items]      
Liabilities arising from financing activities 3,826 3,355  
Additions 1,275 930  
Payments (639) (632)  
Interest paid (90) (75)  
Cash flow from financing activities 546 223  
Effect of exchange rate (55) 177  
Interest accretion 87 71  
Non-cash changes 32 248  
Liabilities arising from financing activities $ 4,404 $ 3,826 $ 3,355