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Intangible assets (Tables)
 6 Months Ended
Jun. 30, 2024
Notes and other explanatory information [abstract]  
Schedule of intangible assets by class of assets
       
  Rights and Concessions (1) Software Goodwill Total
Balance at December 31, 2023 2,425 592 25 3,042
Cost 2,489 1,891 25 4,405
Accumulated amortization and impairment (64) (1,299) − (1,363)
Addition 1 101 − 102
Capitalized borrowing costs − 4 − 4
Transfers − 4 − 4
Amortization (2) (65) − (67)
Translation adjustment (312) (82) (3) (397)
Balance at June 30, 2024 2,112 554 22 2,688
Cost 2,169 1,736 22 3,927
Accumulated amortization and impairment (57) (1,182) − (1,239)
Estimated useful life in years (2) 5 Indefinite  
         
Balance at December 31, 2022 2,523 439 24 2,986
Cost 2,578 1,560 24 4,162
Accumulated amortization and impairment (55) (1,121) − (1,176)
Addition 148 84 − 232
Capitalized borrowing costs − 6 − 6
Write-offs (35) − − (35)
Transfers − 1 − 1
Signature Bonuses Transfers (3) (6) − − (6)
Amortization (2) (46) − (48)
Translation adjustment 210 39 2 251
Balance at June 30, 2023 2,838 523 26 3,387
Cost 2,900 1,779 26 4,705
Accumulated amortization and impairment (62) (1,256) − (1,318)
Estimated useful life in years (2) 5 Indefinite  
(1)  It comprises mainly signature bonuses (amounts paid in concession and production sharing contracts for oil or natural gas exploration), in addition to public service concessions, trademarks and patents and others.
(2)  Mainly composed of assets with indefinite useful lives, which are reviewed annually to determine whether events and circumstances continue to support an indefinite useful life assessment.
(3)  Transfer to PP&E Assets. In 2023, it refers to the declaration of commerciality of the Manjuba field.