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Subsequent events (Tables)
 12 Months Ended
Dec. 31, 2022
Subsequent Events  
Schedule of capitalized costs for oil and gas exploration and production activities
   
  Consolidated entities  
    Abroad  

Equity

Method

Investees

  Brazil

South

America

 Others Total Total
December 31, 2022            
Unproved oil and gas properties 4,227 55 − 55 4,282 −
Proved oil and gas properties 83,030 205 − 205 83,235 762
Support Equipment 69,735 732 1 733 70,468 −
Gross Capitalized costs 156,993 992 1 993 157,986 762
Depreciation, depletion and amortization (52,836) (769) (1) (770) (53,606) (224)
Net capitalized costs 104,156 223 − 223 104,380 538
December 31, 2021            
Unproved oil and gas properties 4,455 115 - 115 4,570 -
Proved oil and gas properties 80,523 172 - 172 80,695 832
Support Equipment 67,988 777 1 778 68,766 -
Gross Capitalized costs 152,967 1,064 1 1,065 154,032 832
Depreciation, depletion and amortization (51,621) (733) (1) (734) (52,355) (296)
Net capitalized costs 101,345 331 - 331 101,677 536
December 31, 2020            
Unproved oil and gas properties 17,438 112 - 112 17,550 -
Proved oil and gas properties 61,857 140 - 140 61,997 792
Support Equipment 73,199 761 1 762 73,961 -
Gross Capitalized costs 152,494 1,013 1 1,014 153,508 792
Depreciation, depletion and amortization (43,008) (687) (1) (688) (43,696) (316)
Net capitalized costs 109,486 326 - 326 109,812 476
[custom:DisclosureOfCostsIncurredInOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesExplanatory]
  Consolidated entities  
    Abroad  

Equity

Method

Investees

  Brazil

South

America

 Total Total
December 31, 2022          
Acquisition costs:          
Proved − − − − −
Unproved 892 − − 892 −
Exploration costs 707 51 51 758 1
Development costs 6,883 31 31 6,914 30
Total 8,482 82 82 8,564 31
December 31, 2021          
Acquisition costs:          
Proved − − − − −
Unproved − − − − −
Exploration costs 682 5 5 687 −
Development costs 6,035 44 44 6,079 37
Total 6,717 49 49 6,766 37
December 31, 2020          
Acquisition costs:          
Proved 315 − − 315 −
Unproved 24 − − 24 −
Exploration costs 805 10 10 815 −
Development costs 5,664 3 3 5,667 57
Total 6,808 13 13 6,821 57
Summary of the annual changes in the proved reserves of oil is as follows (in millions of barrels):
         
  Consolidated Entities   Equity Method Investees    
Proved developed and undeveloped reserves(*) Crude oil in Brazil

Crude Oil in South

America

 Synthetic Oil in Brazil Consolidated Total  

Crude Oil in North

America

 Crude Oil in Africa   Total
Reserves at December 31, 2019 8,083 1 8 8,092   23 42   8,156
Revisions of previous estimates 269 (1) (7) 261   − −   261
Extensions and discoveries 35 − − 35   − −   35
Improved Recovery − − − −   − −   −
Sales of reserves (61) − − (61)   − (41)   (102)
Purchases of reserves − − − −   − −   −
Production for the year (792) − (1) (793)   (4) (1)   (798)
Reserves at December 31, 2020 7,534 − − 7,534   18 −   7,552
Extensions and discoveries − − − −   − −   −
Revisions of previous estimates 1,654 2 11 1,667   1 −   1,668
Sales of reserves (9) − − (9)   − −   (9)
Production for the year (773) − (1) (774)   (3) −   (777)
Reserves at December 31, 2021 8,406 2 10 8,419   17 −   8,435
Revisions of previous estimates 1,705 − − 1,705   3 −   1,708
Sales of reserves (1) (455) − (10) (465)   (1) −   (465)
Production for the year (748) − (1) (749)   (3) −   (752)
Reserves at December 31, 2022 8,908 2 − 8,910   16 −   8,926
Summary of of the annual changes in the proved reserves of natural gas is as follows (in billions of cubic feet):
         
  Consolidated Entities   Equity Method Investees    
Proved developed and undeveloped reserves (*) Natural Gas in Brazil

Natural Gas in South

America

 Synthetic Gas in Brazil Consolidated Total  

Gas Natural in North

America

 Gas Natural in Africa   Total
Reserves at December 31, 2019 8,381 156 12 8,549   9 47   8,605
Revisions of previous estimates (93) (119) (11) (222)   − −   (222)
Extensions and discoveries 36 − − 36   − −   36
Improved Recovery − − − −   − −   −
Sales of reserves (42) − − (42)   − (47)   (90)
Purchases of reserves

 −

 − − −   − −   −
Production for the year (735) (12) (1) (749)   (2) −   (750)
Reserves at December 31, 2020 7,547 26 − 7,572   8 −   7,580
Extensions and discoveries − − − −   − −   −
Revisions of previous estimates 1,615 167 19 1,802   − −   1,802
Sales of reserves (15) − − (15)   − −   (15)
Production for the year (692) (16) (1) (709)   (1) −   (710)
Reserves at December 31, 2021 8,455 177 18 8,650   7 −   8,657
Revisions of previous estimates 1,667 16 − 1,682   − −   1,682
Sales of reserves (1) (408) − (17) (425)   (1) −   (425)
Production for the year (626) (20) (1) (647)   (1) −   (648)
Reserves at December 31, 2022 9,088 173 − 9,261   6 −   9,267
Summary of information about the changes in total proved reserves of crude oil and natural gas, in millions of barrels of oil equivalent, in our consolidated entities and equity method
Summary of information about the changes in total proved reserves of crude oil and natural gas, in millions of barrels of oil equivalent, in our consolidated entities and equity method          
  Consolidated Entities   Equity Method Investees    
Proved developed and undeveloped reserves(*) Oil equivalent in Brazil

Oil equivalent in South

America

 Synthetic Oil in Brazil Consolidated Total  

Oil equivalent in North

America

 Oil equivalent in Africa   Total
Reserves at December 31, 2019 9,480 27 10 9,517   24 49   9,590
Revisions of previous estimates 253 (21) (9) 224   − −   224
Extensions and discoveries 41 − − 41   − −   41
Improved Recovery − − − −   − −   −
Sales of reserves (68) − − (68)   − (49)   (117)
Purchases of reserves − − − −   − −   −
Production for the year (914) (2) (1) (918)   (5) (1)   (923)
Reserves at December 31, 2020 8,792 5 − 8,796   19 −   8,816
Extensions and discoveries − − − −   1 −   1
Revisions of previous estimates 1,923 30 14 1,967   2 −   1,969
Sales of reserves (11) − − (11)   − −   (11)
Production for the year (888) (3) (1) (892)   (3) −   (896)
Reserves at December 31, 2021 9,816 31 13 9,860   18 −   9,878
Revisions of previous estimates 1,983 3 − 1,986   3 −   1,988
Sales of reserves (1) (523) − (12) (536)   (1) −   (536)
Production for the year (852) (4) (1) (857)   (3) −   (860)
Reserves at December 31, 2022 10,423 31 − 10,453   17 −   10,470
[custom:DisclosureOfSupplementaryInformationOnOilAndGasExplorationProductionOfNetProvedDevelopedAndUndevelopedReservesExplanatory]
 
  2020
  Crude Oil Synthetic Oil Natural Gas Synthetic Gas Total oil and gas
  (mmbbl) (bncf) (mmboe)
Net proved developed reserves  (*):          
Consolidated Entities          
Brazil 4,858 − 5,714 − 5,810
South America, outside Brazil (1) − − 26 − 5
Total Consolidated Entities 4,858 − 5,740 − 5,814
Equity Method Investees          
North  America (1) 17 − 7 − 18
Total Equity Method Investees 17 − 7 − 18
Total Consolidated and Equity Method Investees 4,875 − 5,747 − 5,833
Net proved undeveloped reserves  (*):          
Consolidated Entities          
Brazil 2,676 − 1,833 − 2,982
South America, outside Brazil (1) − − − − −
Total Consolidated Entities 2,676 − 1,833 − 2,982
Equity Method Investees          
North  America (1) 1 − 1 − 1
Total Equity Method Investees 1 − 1 − 1
Total Consolidated and Equity Method Investees 2,678 − 1,833 − 2,983
Total proved reserves (developed and undeveloped) 7,552 − 7,580 − 8,816
(1) South America oil reserves includes 21% of natural gas liquid (NGL) in proved developed reserves. North America oil reserves includes 6% of natural gas liquid (NGL) in proved developed reserves and 5% of NGL in proved undeveloped reserves.
(*) Apparent differences in the sum of the numbers are due to rounding off.

 

 

  2021
  Crude Oil Synthetic Oil Natural Gas Synthetic Gas Total oil and gas
  (mmbbl) (bncf) (mmboe)
Net proved developed reserves  (*):          
Consolidated Entities          
Brazil 4,711 10 5,591 18 5,656
South America, outside Brazil (1) 1 − 79 − 14
Total Consolidated Entities 4,712 10 5,669 18 5,670
Equity Method Investees          
North  America (1) 15 − 6 − 16
Total Equity Method Investees 15 − 6 − 16
Total Consolidated and Equity Method Investees 4,727 10 5,675 18 5,686
Net proved undeveloped reserves  (*):          
Consolidated Entities          
Brazil 3,695 − 2,865 − 4,173
South America, outside Brazil (1) 1 − 98 − 17
Total Consolidated Entities 3,696 − 2,963 − 4,190
Equity Method Investees          
North  America (1) 2 − 1 − 2
Total Equity Method Investees 2 − 1 − 2
Total Consolidated and Equity Method Investees 3,698 − 2,964 − 4,192
Total proved reserves (developed and undeveloped) 8,425 10 8,639 18 9,878
(1) South America oil reserves includes 24% of natural gas liquid (NGL) in proved developed reserves and 24% of NGL in proved undeveloped reserves. North America oil reserves includes 2% of natural gas liquid (NGL) in proved developed reserves and 3% of NGL in proved undeveloped reserves.
(*) Apparent differences in the sum of the numbers are due to rounding off.

 

 

 

 

  2022
  Crude Oil Synthetic Oil Natural Gas Synthetic Gas Total oil and gas
  (mmbbl) (bncf) (mmboe)
Net proved developed reserves  (*):          
Consolidated Entities          
Brazil 4,185 − 5,447 − 5,093
South America, outside Brazil (1) 1 − 91 − 16
Total Consolidated Entities 4,186 − 5,538 − 5,109
Equity Method Investees          
North  America (1) 14 − 5 − 15
Total Equity Method Investees 14 − 5 − 15
Total Consolidated and Equity Method Investees 4,200 − 5,543 − 5,124
Net proved undeveloped reserves  (*):          
Consolidated Entities          
Brazil 4,723 − 3,641 − 5,330
South America, outside Brazil (1) 1 − 82 − 14
Total Consolidated Entities 4,724 − 3,723 − 5,345
Equity Method Investees          
North  America (1) 2 − 1 − 2
Total Equity Method Investees 2 − 1 − 2
Total Consolidated and Equity Method Investees 4,726 − 3,724 − 5,347
Total proved reserves (developed and undeveloped) 8,926 − 9,267 − 10,470
(1) South America oil reserves includes 24% of natural gas liquid (NGL) in proved developed reserves and 24% of NGL in proved undeveloped reserves. North America oil reserves includes 2% of natural gas liquid (NGL) in proved developed reserves and 4% of NGL in proved undeveloped reserves.
(*) Apparent differences in the sum of the numbers are due to rounding off

 
Standardized measure of discounted future net cash flows:
     
  Consolidated entities

Equity

Method

Investees

  Brazil

South

America

 Total
December 31, 2022        
Future cash inflows 983,826 837 984,663 1,581
Future production costs (399,655) (357) (400,012) (273)
Future development costs (62,548) (128) (62,676) (21)
Future income tax expenses (178,412) (88) (178,500) −
Undiscounted future net cash flows 343,211 264 343,475 1,287
10 percent midyear annual discount for timing of estimated cash flows (1) (151,828) (124) (151,951) (401)
Standardized measure of discounted future net cash flows 191,383 141 191,524 886
December 31, 2021        
Future cash inflows 612,924 587 613,511 1,129
Future production costs (264,158) (261) (264,419) (329)
Future development costs (44,027) (107) (44,134) (28)
Future income tax expenses (104,568) (61) (104,628) −
Undiscounted future net cash flows 200,171 159 200,330 772
10 percent midyear annual discount for timing of estimated cash flows (1) (85,391) (70) (85,461) (303)
Standardized measure of discounted future net cash flows 114,780 89 114,869 470
December 31, 2020        
Future cash inflows 333,248 69 333,317 667
Future production costs (182,534) (51) (182,585) (465)
Future development costs (31,236) (16) (31,252) (48)
Future income tax expenses (46,862) − (46,862) (79)
Undiscounted future net cash flows 72,616 2 72,618 75
10 percent midyear annual discount for timing of estimated cash flows (1) (26,638) − (26,638) (1)
Standardized measure of discounted future net cash flows 45,978 1 45,979 74
[custom:DisclosureOfStandardizedMeasureOfDiscountedFutureNetCashFlowProjectionsExplanatory]
     
  Consolidated entities

Equity

Method

Investees

  Brazil

South

America

 Total
Balance at January 1, 2022 114,780 89 114,869 470
Sales and transfers of oil and gas, net of production cost (54,230) (62) (54,291) (235)
Development cost incurred 6,883 31 6,913 29
Net change due to purchases and sales of minerals in place (17,030) − (17,030) −
Net change due to extensions, discoveries and improved recovery related costs − − − 10
Revisions of previous quantity estimates 64,535 17 64,553 82
Net change in prices, transfer prices and in production costs 129,462 122 129,584 349
Changes in estimated future development costs (23,317) (39) (23,356) (4)
Accretion of discount 11,478 14 11,492 93
Net change in income taxes (41,178) (17) (41,194) −
Other - unspecified − (15) (15) 92
Balance at December 31, 2022 191,383 141 191,524 886
Balance at January 1, 2021 45,978 1 45,979 74
Sales and transfers of oil and gas, net of production cost (38,074) (43) (38,117) (177)
Development cost incurred 6,035 44 6,079 37
Net change due to purchases and sales of minerals in place (246) − (246) −
Net change due to extensions, discoveries and improved recovery related costs − − − 10
Revisions of previous quantity estimates 41,211 205 41,416 30
Net change in prices, transfer prices and in production costs 108,268 58 108,326 401
Changes in estimated future development costs (19,900) (119) (20,019) 3
Accretion of discount 4,598 − 4,598 49
Net change in income taxes (33,089) (47) (33,136) 48
Other - unspecified − (9) (9) (7)
Balance at December 31, 2021 114,780 89 114,869 470
Balance at January 1, 2020 88,121 69 88,190 1,412
Sales and transfers of oil and gas, net of production cost (24,908) (14) (24,922) (94)
Development cost incurred 5,664 3 5,666 57
Net change due to purchases and sales of minerals in place (847) − (847) (1,047)
Net change due to extensions, discoveries and improved recovery related costs 509 − 509 −
Revisions of previous quantity estimates 3,160 (35) 3,125 (10)
Net change in prices, transfer prices and in production costs (54,606) (145) (54,751) (375)
Changes in estimated future development costs (4,716) 97 (4,618) 67
Accretion of discount 8,812 9 8,821 12
Net change in income taxes 24,788 24 24,812 51
Other - unspecified  -    (7) (7) 1
Balance at December 31, 2020 45,978 1 45,979 74
Apparent differences in the sum of the numbers are due to rounding off.