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Supplementary information on Oil and Gas Exploration and Production (unaudited) (Details 1) - Oil And Gas Producing Activities [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Consolidated Entitiees [Member] |  |  |
Guarantor and Issuer, Guaranteed Security [Line Items] |  |  |
Unproved | $ 146 | $ 892 |
Exploration costs | 873 | 758 | $ 687
Development costs | 10,982 | 6,914 | 6,079
Total | 12,001 | 8,564 | 6,766
Consolidated Entitiees [Member] | Country Of Brazil [Member] |  |  |
Guarantor and Issuer, Guaranteed Security [Line Items] |  |  |
Unproved | 146 | 892 |
Exploration costs | 862 | 707 | 682
Development costs | 10,929 | 6,883 | 6,035
Total | 11,937 | 8,482 | 6,717
Consolidated Entitiees [Member] | South America [Member] |  |  |
Guarantor and Issuer, Guaranteed Security [Line Items] |  |  |
Exploration costs | 11 | 51 | 5
Development costs | 53 | 31 | 44
Total | 64 | 82 | 49
Consolidated Entitiees [Member] | Foreign countries [member] |  |  |
Guarantor and Issuer, Guaranteed Security [Line Items] |  |  |
Exploration costs | 11 | 51 | 5
Development costs | 53 | 31 | 44
Total | 64 | 82 | 49
Equity Method Investeee [Member] |  |  |
Guarantor and Issuer, Guaranteed Security [Line Items] |  |  |
Exploration costs | 10 | 1 |
Development costs | 37 | 30 | 37
Total | $ 47 | $ 31 | $ 37

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