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Supplementary information on Oil and Gas Exploration and Production (unaudited) (Details 5) - bbl
bbl in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Consolidated Entitiees [Member] | Country Of Brazil [Member] | Oil And Gas Producing Activities [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Beginning balance 10,423 9,816 8,792
Extensions and discoveries 233    
Revisions of previous estimates 1,260 1,983 1,923
Sales of reserves (155) (523) (11)
Production for the year (888) (852) (888)
Ending balance 10,873 10,423 9,816
Consolidated Entitiees [Member] | Country Of Brazil [Member] | Synthetics Oil 1 [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Beginning balance   13  
Revisions of previous estimates     14
Sales of reserves   (12)  
Production for the year   (1) (1)
Ending balance     13
Consolidated Entitiees [Member] | South America One [Member] | Oil And Gas Producing Activities [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Beginning balance 33 33 5
Extensions and discoveries 3    
Revisions of previous estimates (1) 3 32
Production for the year (4) (4) (3)
Ending balance   33 33
Consolidated Entitiees [Member] | South America [Member] | Oil And Gas Producing Activities [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Beginning balance 33 33  
Ending balance 31 33 33
Consolidated Entitie 2 [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Beginning balance 10,455 9,862 8,797
Extensions and discoveries 236    
Revisions of previous estimates 1,259 1,986 1,969
Sales of reserves (155) (536) (11)
Production for the year (892) (857) (892)
Ending balance 10,904 10,455 9,862
Equity Method Investeee [Member] | North America One [Member] | Oil And Gas Producing Activities [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Beginning balance 17 18 19
Extensions and discoveries     1
Revisions of previous estimates 2 3 2
Sales of reserves   (1)  
Production for the year (2) (3) (3)
Ending balance 17 17 18
Equity Method Investees 2 [Member]      
Guarantor and Issuer, Guaranteed Security [Line Items]      
Beginning balance 10,473 9,880 8,816
Extensions and discoveries 237   1
Revisions of previous estimates 1,262 1,989 1,971
Sales of reserves (155) (536) (11)
Production for the year (894) (860) (896)
Ending balance 10,921 10,473 9,880