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Employee benefits (Details 6) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
IfrsStatementLineItems [Line Items]        
Defined benefit obligation, at present value $ (106) $ (409) $ (208) $ (533)
Related to retirees (other income and expenses) (324) (1,293) (639) (1,602)
Net costs (430) (1,702) (847) (2,135)
Pension Plans P P S P R [Member]        
IfrsStatementLineItems [Line Items]        
Defined benefit obligation, at present value (7) (11) (13) (19)
Related to retirees (other income and expenses) (84) (92) (166) (191)
Net costs (91) (103) (179) (210)
Pension Plans P P S P N R [Member]        
IfrsStatementLineItems [Line Items]        
Defined benefit obligation, at present value   (3) (1) (5)
Related to retirees (other income and expenses) (38) (36) (75) (75)
Net costs (38) (39) (76) (80)
Health Care Plan Saude Petrobras [Member]        
IfrsStatementLineItems [Line Items]        
Defined benefit obligation, at present value (99) (395) (194) (508)
Related to retirees (other income and expenses) (200) (1,162) (395) (1,330)
Net costs (299) (1,557) (589) (1,838)
Pension Plans Petros 2 [Member]        
IfrsStatementLineItems [Line Items]        
Defined benefit obligation, at present value       (1)
Related to retirees (other income and expenses) (2) (3) (3) (6)
Net costs $ (2) $ (3) $ (3) $ (7)