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Supplementary information on Oil and Gas Exploration and Production (unaudited) (Details 4) - bbl
bbl in Billions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Consolidated Entitie 1 [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 9,498 8,677 8,106
Extensions and discoveries 7 794  
Revisions of previous estimates 815 668 1,575
Sales of reserves   (47) (397)
Production for the year (569) (594) (606)
Ending balance 9,750 9,498 8,677
Equity Method Investees 1 [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 9,504 8,683 8,113
Extensions and discoveries 7 794  
Revisions of previous estimates 811 669 1,575
Sales of reserves   (47) (398)
Production for the year (570) (595) (607)
Ending balance 9,752 9,504 8,683
Country Of Brazil [Member] | Consolidated Entitie 1 [Member] | Natural Gas [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 9,335 8,504 7,912
Extensions and discoveries 779  
Revisions of previous estimates 796 673 1,560
Sales of reserves   (47) (382)
Production for the year (549) (573) (586)
Ending balance 9,582 9,335 8,504
Country Of Brazil [Member] | Consolidated Entitie 1 [Member] | Synthetics Gas 1 [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance     17
Sales of reserves     (15)
Production for the year     (1)
Country South America [Member] | Consolidated Entitie 1 [Member] | Natural Gas [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 163 173 177
Extensions and discoveries 7 15  
Revisions of previous estimates 19 (5) 16
Production for the year (20) (20) (20)
Ending balance 168 163 173
Country North America [Member] | Equity Method Investees 1 [Member] | Natural Gas [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 7 6 7
Revisions of previous estimates (4) 1  
Sales of reserves     (1)
Production for the year (1) (1) (1)
Ending balance 2 7 6