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Lease liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Balance at Opening $ 23,043 $ 21,650
Remeasurement / new contracts 4,949 6,129
Payment of principal and interest (*) (5,423) (5,827)
Interest expenses 1,356 1,233
Foreign exchange gains and losses (1,390) 1,439
Translation adjustment 1,457 (1,582)
Transfers (147) 1
Balance at Ending 23,845 23,043
Current borrowings and current portion of non-current borrowings 3,576 3,641
Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Balance at Opening 4,604 4,340
Remeasurement / new contracts 2,730 1,655
Payment of principal and interest (*) (1,785) (1,560)
Interest expenses 365 243
Foreign exchange gains and losses (169) 151
Translation adjustment 287 (272)
Transfers (12) 47
Balance at Ending 6,020 4,604
Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Balance at Opening 18,439 17,310
Remeasurement / new contracts 2,219 4,474
Payment of principal and interest (*) (3,638) (4,267)
Interest expenses 991 990
Foreign exchange gains and losses (1,221) 1,288
Translation adjustment 1,170 (1,310)
Transfers (135) (46)
Balance at Ending $ 17,825 $ 18,439