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Cash flows reconciliation - Reconciliation of debt to cash flow (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
IfrsStatementLineItems [Line Items]        
Liabilities arising from financing activities     $ 11,181 $ 12,180
Additions     1,800 625
Payments $ (581) $ (1,433) (620) (1,828)
Interest paid [1]     (369) (456)
Cash flow from financing activities     811 (1,659)
Effect of exchange rate     44 72
Interest accretion     381 438
Non-cash changes     425 510
Liabilities arising from financing activities 12,417 11,031 12,417 11,031
Quoted In Secondary Market [Member]        
IfrsStatementLineItems [Line Items]        
Liabilities arising from financing activities     6,497 7,974
Additions     1,500  
Payments     (517) (1,317)
Interest paid [1]     (237) (388)
Cash flow from financing activities     746 (1,705)
Effect of exchange rate     7 71
Interest accretion     234 318
Non-cash changes     241 389
Liabilities arising from financing activities 7,484 6,658 7,484 6,658
Debt Contract Brazil [Member]        
IfrsStatementLineItems [Line Items]        
Liabilities arising from financing activities     280 380
Payments     (38) (174)
Interest paid [1]     (16) (37)
Cash flow from financing activities     (54) (211)
Effect of exchange rate     34 77
Interest accretion     16 89
Non-cash changes     50 166
Liabilities arising from financing activities 276 335 276 335
Debt Contracts International Markets [Member]        
IfrsStatementLineItems [Line Items]        
Liabilities arising from financing activities     4,404 3,826
Additions     300 625
Payments     (65) (337)
Interest paid [1]     (116) (31)
Cash flow from financing activities     119 257
Effect of exchange rate     3 (76)
Interest accretion     131 31
Non-cash changes     134 (45)
Liabilities arising from financing activities $ 4,657 $ 4,038 $ 4,657 $ 4,038
[1] Classified as operating activities in the statement of cash flows.