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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Consolidated Entitiees [Member]      
IfrsStatementLineItems [Line Items]      
Unproved $ 21 $ 146 $ 892
Exploration costs 980 873 758
Development costs 14,041 10,982 6,914
Total 15,042 12,001 8,564
Consolidated Entitiees [Member] | Country Of Brazil [Member]      
IfrsStatementLineItems [Line Items]      
Unproved 21 146 892
Exploration costs 861 862 707
Development costs 14,007 10,929 6,883
Total 14,889 11,937 8,482
Consolidated Entitiees [Member] | Country South America [Member]      
IfrsStatementLineItems [Line Items]      
Exploration costs 119 11 51
Development costs 34 53 31
Total 153 64 82
Consolidated Entitiees [Member] | Foreign Countries [Member]      
IfrsStatementLineItems [Line Items]      
Exploration costs 119 11 51
Development costs 34 53 31
Total 153 64 82
Equity Method Investeee [Member]      
IfrsStatementLineItems [Line Items]      
Exploration costs   10 1
Development costs 14 37 30
Total $ 14 $ 47 $ 31