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Supplementary information on Oil and Gas Exploration and Production (unaudited) (Details 3) - bbl
bbl in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Consolidated Entitie [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 9,212 8,910 8,419
Extensions and discoveries   95  
Revisions of previous estimates 1,185 1,140 1,705
Sales of reserves   (147) (465)
Production for the year (761) (786) (749)
Ending balance 9,636 9,212 8,910
Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 9,228 8,926 8,435
Extensions and discoveries   95  
Revisions of previous estimates 1,184 1,142 1,708
Sales of reserves   (147) (465)
Production for the year (764) (789) (752)
Ending balance 9,649 9,228 8,926
Country Of Brazil [Member] | Consolidated Entitie [Member] | Crude Oil [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 9,210 8,908 8,406
Extensions and discoveries 95  
Revisions of previous estimates 1,185 1,140 1,705
Sales of reserves   (147) (455)
Production for the year (761) (786) (748)
Ending balance 9,634 9,210 8,908
Country Of Brazil [Member] | Consolidated Entitie [Member] | Synthetics Oil [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance     10
Sales of reserves     (10)
Production for the year     (1)
Country South America [Member] | Consolidated Entitie [Member] | Crude Oil [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 2 2 2
Ending balance 2 2 2
Country North America [Member] | Equity Method Investees [Member] | Crude Oil [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 16 16 17
Revisions of previous estimates   2 3
Sales of reserves     (1)
Production for the year (2) (2) (3)
Ending balance 13 16 16