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Supplementary information on Oil and Gas Exploration and Production (unaudited) (Details 6) - bbl
bbl in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 11,386 10,921 10,473
Net develop proved developed reserves   5,727 5,125
Net Proved Undeveloped reserves 5,514 5,194 5,348
Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 5,858 5,711 5,110
Net Proved Undeveloped reserves 5,514 5,193 5,346
Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 14 15 15
Total Consolidated And Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 5,872    
Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves 2 2
Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 5,843 5,694 5,093
Net Proved Undeveloped reserves 5,497 5,179 5,330
South America Outside Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 15 17 17
Net Proved Undeveloped reserves 17 13 15
North America One [Member] | Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 14 15 15
North America One [Member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves   2 2
Crude Oil 1 [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 9,649 9,228 8,926
Net develop proved developed reserves 4,898 4,726 4,200
Net Proved Undeveloped reserves 4,751 4,503 4,726
Crude Oil 1 [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 4,885 4,711 4,186
Net Proved Undeveloped reserves 4,751 4,501 4,724
Crude Oil 1 [Member] | Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 13 14 14
Crude Oil 1 [Member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves   2 2
Crude Oil 1 [Member] | Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 4,884 4,710 4,185
Net Proved Undeveloped reserves 4,750 4,500 4,723
Crude Oil 1 [Member] | South America Outside Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 1 1 1
Net Proved Undeveloped reserves 1 1 1
Crude Oil 1 [Member] | North America One [Member] | Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 13 14 14
Crude Oil 1 [Member] | North America One [Member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves   2 2
Natural Gas [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 9,752 9,504 8,683
Net develop proved developed reserves 5,469 5,620 5,193
Net Proved Undeveloped reserves 4,283 3,885 3,490
Natural Gas [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 5,467 5,614 5,188
Net Proved Undeveloped reserves 4,283 3,884 3,489
Natural Gas [Member] | Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 2 6 5
Natural Gas [Member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves   1 1
Natural Gas [Member] | Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 5,387 5,522 5,097
Net Proved Undeveloped reserves 4,194 3,814 3,407
Natural Gas [Member] | South America Outside Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 80 92 91
Net Proved Undeveloped reserves 89 70 82
Natural Gas [Member] | North America One [Member] | Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 2 6 5
Natural Gas [Member] | North America One [Member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves   1 1