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Employee benefits (Details 6) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Net defined benefit liability (asset) $ 23,805 $ 20,447 $ 27,217
Fair Value of Plan Assets (12,559) (10,567) (11,575)
Actuarial Liability Net 11,246 9,880  
Actuarial Liability 9,880 [1],[2] 16,069 [3]  
Euro Per Dollar 1,228 2,098  
Current Service Cost For Defined Benefits Plan 129 199  
Net Interest1 1,099 1,031  
Disclosure of Foreign Currency Exchange Exposure 1,583 (5,169)  
Reasonably Possible Scenario 1,583 (5,169)  
Cash Effects1 (2,130) (2,239)  
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan by plan participants (782) (870) [4]  
Payments Related To Term Of Financial Commitment Actuarial Liability (1,348) (928)  
Investments in Associates Quoted Stock Exchange Price 685 (879)  
Others changes (9)    
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) 694 (879)  
Actuarial Liability 11,246 9,880 [1],[2]  
Past Service Cost   844  
Present Value Of Obligation   82  
PlanAssets Transferred To PP]   518  
Sponsor Contribution For PP   244  
Payments Of Obligations With Contribution For Revision Of Lump Sum Death Benefit   (441)  
Line of credit facility amount withdrawn      
IfrsStatementLineItems [Line Items]      
Net defined benefit liability (asset) 12,771 [1],[5] 11,481 [6] 15,847 [7]
Fair Value of Plan Assets (8,881) [1] (7,431) [6],[8] (8,650) [9]
Actuarial Liability Net 3,890 [1] 4,050 [6]  
Actuarial Liability [6] 4,050 [1],[2] 7,524 [3]  
Euro Per Dollar 457 [1] 469  
Current Service Cost For Defined Benefits Plan 10 [1] 13 [6]  
Net Interest1 447 [1] 438 [6]  
Disclosure of Foreign Currency Exchange Exposure 420 [1] (2,223) [6]  
Reasonably Possible Scenario 420 [1] (2,223) [6]  
Cash Effects1 (1,325) [1] (1,339) [6]  
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan by plan participants (304) [1] (475) [4],[6]  
Payments Related To Term Of Financial Commitment Actuarial Liability (1,021) [1] (524) [6]  
Investments in Associates Quoted Stock Exchange Price 288 [1] (381) [6]  
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) 288 [1] (381) [6]  
Actuarial Liability [1] 3,890 4,050 [2],[6]  
Past Service Cost [6]   (1)  
Present Value Of Obligation [6]   (730)  
PlanAssets Transferred To PP] [6]   496  
Sponsor Contribution For PP [6]   233  
Payments Of Obligations With Contribution For Revision Of Lump Sum Death Benefit [6]   (340)  
Petroleo Brasileiro S-A [member]      
IfrsStatementLineItems [Line Items]      
Net defined benefit liability (asset) 4,119 [1],[5] 3,485 [6] 4,811 [7]
Fair Value of Plan Assets (2,739) [1] (2,316) [6],[8] (2,213) [9]
Actuarial Liability Net 1,380 [1] 1,169 [6]  
Actuarial Liability [6] 1,169 [1],[2] 2,696 [3]  
Euro Per Dollar 129 [1] 178 [6]  
Current Service Cost For Defined Benefits Plan 1 [1] 1 [6]  
Net Interest1 128 [1] 172 [6]  
Disclosure of Foreign Currency Exchange Exposure 417 [1] (989) [6]  
Reasonably Possible Scenario 417 [1] (989) [6]  
Cash Effects1 (421) [1] (591) [6]  
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan by plan participants (94) [1] (86) [4],[6]  
Payments Related To Term Of Financial Commitment Actuarial Liability (327) [1] (404) [6]  
Investments in Associates Quoted Stock Exchange Price 86 [1] (125) [6]  
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) 86 [1] (125) [6]  
Actuarial Liability [1] 1,380 1,169 [2],[6]  
Present Value Of Obligation [6]   (33)  
PlanAssets Transferred To PP] [6]   22  
Sponsor Contribution For PP [6]   11  
Payments Of Obligations With Contribution For Revision Of Lump Sum Death Benefit [6]   (101)  
Pension Plans Petros Two [Member]      
IfrsStatementLineItems [Line Items]      
Net defined benefit liability (asset) 1,102 987 1,177
Fair Value of Plan Assets (939) (822) (700)
Actuarial Liability Net 163 165  
Actuarial Liability 165 [1],[2] 477 [3]  
Euro Per Dollar 33 72  
Current Service Cost For Defined Benefits Plan 13 37  
Net Interest1 20 35  
Disclosure of Foreign Currency Exchange Exposure (45) (362)  
Reasonably Possible Scenario (45) (362)  
Investments in Associates Quoted Stock Exchange Price 10 (22)  
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) 10 (22)  
Actuarial Liability 163 165 [1],[2]  
Collaboration arrangements [domain]      
IfrsStatementLineItems [Line Items]      
Net defined benefit liability (asset) 5,813 4,485 5,356
Actuarial Liability Net 5,813 4,485  
Actuarial Liability 4,485 [1],[2] 5,356 [3]  
Euro Per Dollar 609 1,388  
Current Service Cost For Defined Benefits Plan 105 158  
Net Interest1 504 385  
Disclosure of Foreign Currency Exchange Exposure 791 (1,601)  
Reasonably Possible Scenario 791 (1,601)  
Cash Effects1 (384) (309)  
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan by plan participants (384) (309) [4]  
Investments in Associates Quoted Stock Exchange Price 312 (349)  
Others changes 1    
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) 311 (349)  
Actuarial Liability 5,813 4,485 [1],[2]  
Past Service Cost   845  
Present Value Of Obligation   845  
Other plans [member]      
IfrsStatementLineItems [Line Items]      
Net defined benefit liability (asset)   9 26
Fair Value of Plan Assets   2 $ (12)
Actuarial Liability Net   11  
Actuarial Liability 11 [1],[2] 16 [3]  
Euro Per Dollar   (9)  
Current Service Cost For Defined Benefits Plan   (10)  
Net Interest1   1  
Disclosure of Foreign Currency Exchange Exposure   6  
Reasonably Possible Scenario   6  
Investments in Associates Quoted Stock Exchange Price (11) (2)  
Others changes (10)    
Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) $ (1) (2)  
Actuarial Liability [1],[2]   $ 11  
[1] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.
[2] It includes the payment of US$ 1,324 of a portion of the TFC made on February 25, 2022.
[3] It includes obligations with contribution for the revision of the lump sum death benefit.
[4] It includes the contribution for the migration to PP-3 (US$ 241).
[5] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.
[6] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.
[7] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.
[8] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.
[9] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.