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Other income and expenses, net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Notes and other explanatory information [abstract]      
Stoppages for asset maintenance and pre-operating expenses $ (2,617) $ (2,205) $ (1,834)
Losses on decommissioning of returned/abandoned areas (2,584) (1,195) (225)
Pension and medical benefits - retirees (2,196) (1,172) (1,015)
Losses with legal, administrative and arbitration proceedings (996) (797) (1,362)
Variable compensation programs (1) (932) (1,011) (678)
Allowance (reversals) for credit loss on trade and other receivables, net (260) (18) 3
Institutional relations and cultural projects (224) (156) (103)
Operating expenses with thermoelectric power plants (221) (189) (150)
Expenses with contractual fines received (136) (199) (91)
Compensation for the termination of vessel charter agreements (19) (331) (13)
Collective bargaining agreement (8) (217)
Gains (losses) with commodities derivatives 42 11 (256)
Amounts recovered from Lava Jato investigation 60 109 96
Government grants 161 315 471
Ship/take or pay agreements 219 238 105
Results on disposal/write-offs of assets 228 1,295 1,144
Fines imposed on suppliers 249 239 228
Results from co-participation agreements in bid areas 259 284 4,286
Results of non-core activities 261 170 168
Early termination and changes to cash flow estimates of leases 349 415 629
Reimbursements from E&P partnership operations 493 571 683
Others (21) (188) (264)
Total $ (7,893) $ (4,031) $ 1,822