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Employee benefits (Details 11) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value $ (370)    
Other assets used by entity included in fair value of plan assets (1,172)    
Net expenses (1,542) $ (1,228) $ (2,098)
Pension Plans PPSP-R [member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value (48)    
Other assets used by entity included in fair value of plan assets (442)    
Net expenses (490) (457) (469)
Pension Plans PPSP-NR [member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value (9)    
Other assets used by entity included in fair value of plan assets (160)    
Net expenses (169) (129) (178)
Pension Plans Petros 2 [member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value (14)    
Other assets used by entity included in fair value of plan assets (16)    
Net expenses (30) (33) (72)
Health Care Plan Saude Petrobras [Member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value (299)    
Other assets used by entity included in fair value of plan assets (554)    
Net expenses $ (853) $ (609) (1,388)
Other plans [member]      
IfrsStatementLineItems [Line Items]      
Net expenses     $ 9