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Subsequent events (Details 6) - bbl bbl in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 10,470 | 9,878 | 8,816
Net Proved developed reserves |  | 5,686 | 5,833
Net Proved Undeveloped reserves | 5,347 | 4,192 | 2,983
Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 5,109 | 5,670 | 5,814
Net Proved developed reserves | 15 | 16 | 18
Net Proved Undeveloped reserves | 5,345 | 4,190 | 2,982
Equity Method Investees [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved Undeveloped reserves | 2 | 2 | 1
Total Consolidated And Equity Method Investees [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 5,124 |  |
Brazil [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 5,093 | 5,656 | 5,810
Net Proved Undeveloped reserves | 5,330 | 4,173 | 2,982
South America Outside Brazil [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 16 | 14 | 5
Net Proved Undeveloped reserves | 14 | 17 |
North America [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 15 | 16 | 18
North America [Member] | Equity Method Investees [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved Undeveloped reserves | 2 | 2 | 1
Crude Oil 1 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 8,926 | 8,425 | 7,552
Net Proved developed reserves | 4,200 | 4,727 | 4,875
Net Proved Undeveloped reserves | 4,726 | 3,698 | 2,678
Crude Oil 1 [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 4,186 | 4,712 | 4,858
Net Proved developed reserves | 14 | 15 | 17
Net Proved Undeveloped reserves | 4,724 | 3,696 | 2,676
Crude Oil 1 [Member] | Equity Method Investees [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved Undeveloped reserves | 2 | 2 | 1
Crude Oil 1 [Member] | Brazil [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 4,185 | 4,711 | 4,858
Net Proved Undeveloped reserves | 4,723 | 3,695 | 2,676
Crude Oil 1 [Member] | South America Outside Brazil [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 1 | 1 |
Net Proved Undeveloped reserves | 1 | 1 |
Crude Oil 1 [Member] | North America [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 14 | 15 | 17
Crude Oil 1 [Member] | North America [Member] | Equity Method Investees [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved Undeveloped reserves | 2 | 2 | 1
Natural Gas [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 9,267 | 8,639 | 7,580
Net Proved developed reserves | 5,543 | 5,675 | 5,747
Net Proved Undeveloped reserves | 3,724 | 2,964 | 1,833
Natural Gas [member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 5,538 | 5,669 | 5,740
Net Proved developed reserves | 5 | 6 | 7
Net Proved Undeveloped reserves | 3,723 | 2,963 | 1,833
Natural Gas [member] | Equity Method Investees [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved Undeveloped reserves | 1 | 1 | 1
Natural Gas [member] | Brazil [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 5,447 | 5,591 | 5,714
Net Proved Undeveloped reserves | 3,641 | 2,865 | 1,833
Natural Gas [member] | South America Outside Brazil [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 91 | 79 | 26
Net Proved Undeveloped reserves | 82 | 98 |
Natural Gas [member] | North America [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves | 5 | 6 | 7
Natural Gas [member] | North America [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 Proved developed reserves |  | 10 |
Synthetic Oil [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves |  | 10 |
Synthetic Oil [Member] | Brazil [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves |  | 10 |
Synthetic Gas [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves |  | 18 |
Net Proved developed reserves |  | 18 |
Synthetic Gas [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves |  | 18 |
Synthetic Gas [Member] | Brazil [Member] | Total Consolidated Entities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Net Proved developed reserves |  | 18 |

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