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Intangible assets (Tables)
 6 Months Ended
Jun. 30, 2022
Intangible Assets  
Schedule of class of assets

  Rights and Concessions (*) Software Goodwill Total
Balance at December 31, 2021 2,695 308 22 3,025
Cost 2,744 1,321 22 4,087
Accumulated amortization and impairment (49) (1,013) - (1,062)
Addition 895 87 - 982
Capitalized borrowing costs - 5 - 5
Write-offs (11) (1) - (12)
Transfers (10) (1) - (11)
Signature Bonuses Transfers (**) (840) - - (840)
Amortization (2) (35) - (37)
Impairment recognition - (1) - (1)
Cumulative  translation adjustment 124 18 1 143
Balance at June 30, 2022 2,851 380 23 3,254
Cost 2,905 1,487 23 4,415
Accumulated amortization and impairment (54) (1,107) - (1,161)
Estimated useful life in years (***) 5 Indefinite  
         
  Rights and Concessions (*) Software Goodwill Total
Balance at December 31, 2020 14,714 210 24 14,948
Addition 12 59 - 71
Capitalized borrowing costs - 2 - 2
Write-offs (7) - - (7)
Transfers (43) 2 - (41)
Amortization (4) (28) - (32)
Cumulative  translation adjustment 571 8 1 580
Balance at June 30, 2021 15,243 253 25 15,521
Cost 15,336 1,351 25 16,712
Accumulated amortization and impairment (93) (1,098) - (1,191)
(*) It comprises mainly signature bonuses (amounts paid in concession contracts for oil or natural gas exploration and production sharing), in addition to public service concessions, trademarks and patents and others.
(**) Transfer to PP&E relating to Sépia and Atapu.
(***) 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.