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Employee benefits (Details 9) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value $ (738)    
Other assets used by entity included in fair value of plan assets (2,196)    
Net expenses (2,934) $ (1,542) $ (1,228)
Pension Plans PPSP-R [member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value (34)    
Other assets used by entity included in fair value of plan assets (365)    
Net expenses (399) (490) (457)
Pension Plans PPSP-NR [member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value (10)    
Other assets used by entity included in fair value of plan assets (143)    
Net expenses (153) (169) (129)
Pension Plans Petros 2 [member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value (2)    
Other assets used by entity included in fair value of plan assets (11)    
Net expenses (13) (30) (33)
Health Care Plan Saude Petrobras [Member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value (692)    
Other assets used by entity included in fair value of plan assets (1,677)    
Net expenses $ (2,369) $ (853) $ (609)