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Employee benefits (Details 3) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Total Net defined benefit liability $ 14,620 $ 16,382
Current 885 907
Non-current 13,735 15,475
Health Care Plan Saude Petrobras A M S [Member]    
IfrsStatementLineItems [Line Items]    
Total Net defined benefit liability 8,758 9,662
Petros Pension Plan Renegotiated PPSPR [Member]    
IfrsStatementLineItems [Line Items]    
Total Net defined benefit liability 3,665 4,221
Petros Pension Plan Non Renegotiated PPSP-NR [Member]    
IfrsStatementLineItems [Line Items]    
Total Net defined benefit liability 1,170 1,338
Petros Pension Plan Renegotiated Pre 70 (PPSP-R Pre 70) [Member]    
IfrsStatementLineItems [Line Items]    
Total Net defined benefit liability 459 519
Petros Pension Plan Non Renegotiated Pre 70 (PPSP-NR Pre 70) [Member]    
IfrsStatementLineItems [Line Items]    
Total Net defined benefit liability 410 461
Petros 2 Pension Plan PP2 [Member]    
IfrsStatementLineItems [Line Items]    
Total Net defined benefit liability $ 158 $ 181