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Employee benefits (Details 8) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Fair value of plan assets at the end of the year $ 10,567 $ 11,575
Euro Per Real [member] 1,169 961
Interest Income On Plan Assets 1,169 961
Derivatives Assets [member] (137) (617)
Return On Plan Assets Due To Lower Interest Income (137) (617)
Statement Table 2,130 1,798
Contributions Paid By Sponsor Company 782 870
Term Of Financial Commitment Paid By Company Fair Value Of Plan Assets 1,348 928
Investments in associates Market Value (1,170) (3,150)
Diesel [Member] 29 33
Disclosure Of Pension Plan Assets By Type Of Asset Explanatory (1,923) (1,645)
Others   (4,019)
Transfer And Contribution For Pp3 2 (711)
Cumulative Translation Adjustments 1 722 (827)
Fair value of plan assets at the end of the year 12,559 10,567
Fair value of plan assets at the beginning of the year 12,559 10,567
Line of credit facility amount withdrawn    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets at the end of the year 7,431 [1],[2] 8,650 [3]
Euro Per Real [member] 820 [1] 728 [3]
Interest Income On Plan Assets 820 [1] 728 [3]
Derivatives Assets [member] (139) [1] (746) [3]
Return On Plan Assets Due To Lower Interest Income (139) [1] (746) [3]
Statement Table 1,325 [1] 999 [3]
Contributions Paid By Sponsor Company 304 [1] 475 [3]
Term Of Financial Commitment Paid By Company Fair Value Of Plan Assets 1,021 [1] 524 [3]
Investments in associates Market Value (556) [1] (2,200) [3]
Diesel [Member] 23 [1] 26 [3]
Disclosure Of Pension Plan Assets By Type Of Asset Explanatory (1,088) [1] (952) [3]
Others [4]   (2,575)
Transfer And Contribution For Pp3 [3] (31) (680)
Cumulative Translation Adjustments 1 509 [1] (594) [3]
Fair value of plan assets at the end of the year 8,881 [5] 7,431 [1],[2]
Fair value of plan assets at the beginning of the year 8,881 [5] 7,431 [1],[2]
Petroleo Brasileiro S-A [member]    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets at the end of the year 2,316 [1],[2] 2,213 [3]
Euro Per Real [member] 253 [1] 182 [3]
Interest Income On Plan Assets 253 [1] 182 [3]
Derivatives Assets [member] (37) [1] (52) [3]
Return On Plan Assets Due To Lower Interest Income (37) [1] (52) [3]
Statement Table 421 [1] 490 [3]
Contributions Paid By Sponsor Company 94 [1] 86 [3]
Term Of Financial Commitment Paid By Company Fair Value Of Plan Assets 327 [1] 404 [3]
Investments in associates Market Value (214) [1] (517) [3]
Diesel [Member] 6 [1] 7 [3]
Disclosure Of Pension Plan Assets By Type Of Asset Explanatory (379) [1] (319) [3]
Others [4]   (640)
Cumulative Translation Adjustments 1 159 [1] (174) [3]
Fair value of plan assets at the end of the year 2,739 [5] 2,316 [1],[2]
Fair value of plan assets at the beginning of the year 2,739 [5] 2,316 [1],[2]
Pension Plans Petros Two [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets at the end of the year 822 700
Euro Per Real [member] 96 50
Interest Income On Plan Assets 96 50
Derivatives Assets [member] 39 194
Return On Plan Assets Due To Lower Interest Income 39 194
Investments in associates Market Value (18) (122)
Disclosure Of Pension Plan Assets By Type Of Asset Explanatory (72) (65)
Others   (144)
Cumulative Translation Adjustments 1 54 (57)
Fair value of plan assets at the end of the year 939 822
Fair value of plan assets at the beginning of the year 939 822
Other plans [member]    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets at the end of the year (2) 12
Euro Per Real [member]   1
Interest Income On Plan Assets   1
Derivatives Assets [member]   (13)
Return On Plan Assets Due To Lower Interest Income   (13)
Investments in associates Market Value 2 (2)
Others 2 (2)
Cumulative Translation Adjustments 1   (2)
Fair value of plan assets at the end of the year   (2)
Fair value of plan assets at the beginning of the year   (2)
Collaboration arrangements [domain]    
IfrsStatementLineItems [Line Items]    
Statement Table 384 309
Contributions Paid By Sponsor Company 384 309
Investments in associates Market Value (384) (309)
Disclosure Of Pension Plan Assets By Type Of Asset Explanatory $ (384) (309)
Others   $ (658)
[1] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.
[2] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.
[3] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.
[4] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.
[5] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.