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Supplementary information on Oil and Gas Exploration and Production (unaudited) (Details) - 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 oil and gas properties $ 3,084 $ 3,825 $ 4,282
Proved oil and gas properties 75,372 82,639 83,235
Support Equipment 95,800 104,043 70,468
Gross Capitalized costs 174,256 190,507 157,986
Depreciation, depletion and amortization (58,756) (63,815) (53,606)
Net capitalized costs 115,500 126,692 104,380
Consolidated Entitiees [Member] | Country Of Brazil [Member]      
IfrsStatementLineItems [Line Items]      
Unproved oil and gas properties 2,924 3,764 4,227
Proved oil and gas properties 75,088 82,396 83,030
Support Equipment 95,073 103,284 69,735
Gross Capitalized costs 173,085 189,444 156,993
Depreciation, depletion and amortization (57,940) (63,003) (52,836)
Net capitalized costs 115,145 126,441 104,156
Consolidated Entitiees [Member] | Country South America [Member]      
IfrsStatementLineItems [Line Items]      
Unproved oil and gas properties 160 61 55
Proved oil and gas properties 284 243 205
Support Equipment 726 758 732
Gross Capitalized costs 1,170 1,062 992
Depreciation, depletion and amortization (815) (811) (769)
Net capitalized costs 355 251 223
Consolidated Entitiees [Member] | Foreign Countries [Member]      
IfrsStatementLineItems [Line Items]      
Unproved oil and gas properties 160 61 55
Proved oil and gas properties 284 243 205
Support Equipment 727 759 733
Gross Capitalized costs 1,171 1,063 993
Depreciation, depletion and amortization (816) (812) (770)
Net capitalized costs 355 251 223
Consolidated Entitiees [Member] | Other Countries [Member]      
IfrsStatementLineItems [Line Items]      
Support Equipment 1 1 1
Gross Capitalized costs 1 1 1
Depreciation, depletion and amortization (1) (1) (1)
Equity Method Investeee [Member]      
IfrsStatementLineItems [Line Items]      
Proved oil and gas properties 651 607 762
Gross Capitalized costs 651 607 762
Depreciation, depletion and amortization (330) (289) (224)
Net capitalized costs $ 321 $ 318 $ 538