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Supplementary information on Oil and Gas Exploration and Production (unaudited) (Details 6) - bbl
bbl in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 10,921 10,473 9,880
Net develop proved developed reserves   5,125 5,687
Net Proved Undeveloped reserves 5,194 5,348 4,193
Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 5,711 5,110 5,671
Net Proved Undeveloped reserves 5,193 5,346 4,191
Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 15 15 16
Total Consolidated And Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 5,727    
Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves 2 2 2
Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 5,694 5,093 5,656
Net Proved Undeveloped reserves 5,179 5,330 4,173
South America Outside Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 17 17 15
Net Proved Undeveloped reserves 13 15 18
North America One [Member] | Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 15 15 16
North America One [Member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves 2 2 2
Crude Oil 1 [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 9,228 8,926 8,425
Net develop proved developed reserves 4,726 4,200 4,727
Net Proved Undeveloped reserves 4,503 4,726 3,698
Crude Oil 1 [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 4,711 4,186 4,712
Net Proved Undeveloped reserves 4,501 4,724 3,696
Crude Oil 1 [Member] | Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 14 14 15
Crude Oil 1 [Member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves 2 2 2
Crude Oil 1 [Member] | Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 4,710 4,185 4,711
Net Proved Undeveloped reserves 4,500 4,723 3,695
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 14 14 15
Crude Oil 1 [Member] | North America One [Member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves 2 2 2
Natural Gas [member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 9,504 8,683 8,096
Net develop proved developed reserves 5,620 5,193 5,316
Net Proved Undeveloped reserves 3,885 3,490 2,780
Natural Gas [member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 5,614 5,188 5,310
Net Proved Undeveloped reserves 3,884 3,489 2,779
Natural Gas [member] | Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 6 5 6
Natural Gas [member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves 1 1 1
Natural Gas [member] | Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 5,522 5,097 5,232
Net Proved Undeveloped reserves 3,814 3,407 2,681
Natural Gas [member] | South America Outside Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves 92 91 79
Net Proved Undeveloped reserves 70 82 98
Natural Gas [member] | North America One [Member] | Total Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net develop proved developed reserves 6 5 6
Natural Gas [member] | North America One [Member] | Equity Method Investees [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved Undeveloped reserves 1 1 1
Synthetic Oil [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves     10
Net develop proved developed reserves     10
Synthetic Oil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves     10
Synthetic Oil [Member] | Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves     10
Synthetic Gas [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves     17
Net develop proved developed reserves     17
Synthetic Gas [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves     17
Synthetic Gas [Member] | Country Of Brazil [Member] | Total Consolidated Entities [Member]      
IfrsStatementLineItems [Line Items]      
Net Proved developed reserves     17