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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
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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

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