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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Consolidated Entitiees [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Unproved oil and gas properties $ 3,825 $ 4,282 $ 4,570
Proved oil and gas properties 82,639 83,235 80,695
Support Equipment 104,044 70,468 68,766
Gross Capitalized costs 190,507 157,986 154,032
Depreciation, depletion and amortization (63,815) (53,606) (52,355)
Net capitalized costs 126,692 104,380 101,677
Consolidated Entitiees [Member] | Country Of Brazil [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Unproved oil and gas properties 3,764 4,227 4,455
Proved oil and gas properties 82,396 83,030 80,523
Support Equipment 103,285 69,735 67,988
Gross Capitalized costs 189,444 156,993 152,967
Depreciation, depletion and amortization (63,003) (52,836) (51,621)
Net capitalized costs 126,442 104,156 101,345
Consolidated Entitiees [Member] | South America [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Unproved oil and gas properties 61 55 115
Proved oil and gas properties 243 205 172
Support Equipment 758 732 777
Gross Capitalized costs 1,062 992 1,064
Depreciation, depletion and amortization (811) (769) (733)
Net capitalized costs 251 223 331
Consolidated Entitiees [Member] | Foreign countries [member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Unproved oil and gas properties 61 55 115
Proved oil and gas properties 243 205 172
Support Equipment 759 733 778
Gross Capitalized costs 1,063 993 1,065
Depreciation, depletion and amortization (812) (770) (734)
Net capitalized costs 251 223 331
Consolidated Entitiees [Member] | Other Countries [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Support Equipment 1 1 1
Gross Capitalized costs 1 1 1
Depreciation, depletion and amortization (1) (1) (1)
Equity Method Investeee [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Proved oil and gas properties 607 762 832
Gross Capitalized costs 607 762 832
Depreciation, depletion and amortization (289) (224) (296)
Net capitalized costs $ 318 $ 538 $ 536