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Supplementary information on Oil and Gas Exploration and Production (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2023
Supplementary Information On Oil And Gas Exploration And Production |
Schedule of capitalized costs for oil and gas exploration and production activities |
Schedule of capitalized costs for oil and gas exploration and production activities |  |  |  |  |  |
| Consolidated entities |
| Brazil | Abroad | Total | Equity Method Investees
|  | South America | Others | Total |
December 31, 2023 |  |  |  |  |  |
Unproved oil and gas properties | 3,764 | 61 | − | 61 | 3,825 | −
Proved oil and gas properties | 82,396 | 243 | − | 243 | 82,639 | 607
Support Equipment | 103,285 | 758 | 1 | 759 | 104,044 | −
Gross Capitalized costs | 189,444 | 1,062 | 1 | 1,063 | 190,507 | 607
Depreciation, depletion and amortization | (63,003) | (811) | (1) | (812) | (63,815) | (289)
Net capitalized costs | 126,442 | 251 | − | 251 | 126,692 | 318
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
Schedule of costs incurred in oil and gas property acquisition, exploration and development activities |
Schedule of costs incurred in oil and gas property acquisition, exploration and development activities |  |  |  |  |
| Consolidated entities |
| Brazil | Abroad | Total | Equity Method Investees
|  | South America | Total |
December 31, 2023 |  |  |  |  |
Acquisition costs: |  |  |  |  |
Proved | − | − | − | − | −
Unproved | 146 | − | − | 146 | −
Exploration costs | 862 | 11 | 11 | 873 | 10
Development costs | 10,929 | 53 | 53 | 10,982 | 37
Total | 11,937 | 64 | 64 | 12,001 | 47
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
Schedule of extractive activities, oil and gas, income taxes are based on statutory tax rates, reflecting allowable deductions |
Schedule of extractive activities, oil and gas, income taxes are based on statutory tax rates, reflecting allowable deductions |  |  |  |  |  |  |
| Consolidated entities | Equity Method Investees
| Brazil | Abroad | Total
|  | South America | North America | Others | Total |
December 31, 2023 |  |  |  |  |  |  |
Net operation revenues: |  |  |  |  |  |  |
Sales to third parties | 631 | 136 | − | − | 136 | 767 | 159
Intersegment | 66,113 | − | − | − | − | 66,113 | −
| 66,744 | 136 | − | − | 136 | 66,880 | 159
Production costs | (16,946) | (63) | − | − | (63) | (17,009) | (36)
Exploration expenses | (981) | (1) | − | − | (1) | (982) | −
Depreciation, depletion and amortization | (10,186) | (44) | − | − | (44) | (10,230) | (26)
Impairment of oil and gas properties | (2,105) | − | − | − | − | (2,105) | (75)
Other operating expenses | (2,504) | (15) | (8) | (1) | (24) | (2,528) | (25)
Results before income tax expenses | 34,023 | 12 | (8) | (1) | 3 | 34,026 | (3)
Income tax expenses | (11,568) | (4) | 3 | 1 | (1) | (11,569) | −
Results of operations (excluding corporate overhead and interest costs) | 22,455 | 8 | (5) | (1) | 2 | 22,457 | (3)
December 31, 2022 |  |  |  |  |  |  |
Net operation revenues: |  |  |  |  |  |  |
Sales to third parties | 1,153 | 158 | − | − | 158 | 1,311 | 275
Intersegment | 76,579 | − | − | − | − | 76,579 | −
| 77,732 | 158 | − | − | 158 | 77,890 | 275
Production costs | (19,975) | (75) | − | − | (75) | (20,050) | (41)
Exploration expenses | (719) | (168) | − | − | (168) | (887) | −
Depreciation, depletion and amortization | (10,373) | (42) | − | − | (42) | (10,415) | (42)
Impairment of oil and gas properties | (1,216) | (2) | − | − | (2) | (1,218) | −
Other operating expenses | 3,000 | (1) | (8) | 21 | 12 | 3,012 | (22)
Results before income tax expenses | 48,449 | (130) | (8) | 21 | (117) | 48,332 | 170
Income tax expenses | (16,474) | 44 | − | (3) | 41 | (16,433) | −
Results of operations (excluding corporate overhead and interest costs) | 31,975 | (86) | (8) | 19 | (76) | 31,899 | 170
December 31, 2021 |  |  |  |  |  |  |
Net operation revenues: |  |  |  |  |  |  |
Sales to third parties | 974 | 131 | − | − | 131 | 1,105 | 220
Intersegment | 54,479 | − | − | − | − | 54,479 | −
| 55,453 | 131 | − | − | 131 | 55,584 | 220
Production costs | (14,601) | (67) | − | − | (67) | (14,668) | (44)
Exploration expenses | (685) | (2) | − | − | (2) | (687) | −
Depreciation, depletion and amortization | (8,959) | (46) | − | − | (46) | (9,005) | (38)
Impairment of oil and gas properties | 3,107 | − | − | − | − | 3,107 | −
Other operating expenses | 809 | 15 | 114 | (118) | 11 | 820 | (17)
Results before income tax expenses | 35,124 | 31 | 114 | (118) | 27 | 35,151 | 121
Income tax expenses | (11,984) | (11) | − | 43 | 33 | (11,951) | −
Results of operations (excluding corporate overhead and interest costs) | 23,141 | 20 | 114 | (75) | 59 | 23,200 | 121
Schedule of summary of the annual changes in the proved reserves of oil |
Schedule of summary of the annual changes in the proved reserves of oil |  |  |  |  |  |  |  |
| 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 |  | Total
At January 1, 2023 | 8,908 | 2 | − | 8,910 |  | 16 |  | 8,926
Extensions and discoveries | 95 | − | − | 95 |  | − |  | 95
Revisions of previous estimates | 1,140 | − | − | 1,140 |  | 2 |  | 1,142
Sales of reserves | (147) | − | − | (147) |  | − |  | (147)
Production for the year | (786) | − | − | (786) |  | (2) |  | (789)
Reserves at December 31, 2023 | 9,210 | 2 | − | 9,212 |  | 16 |  | 9,228
At January 1, 2022 | 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
At January 1, 2021 | 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
(1) Includes the effects of the write-offs related to the Co-Participation Agreements of Atapu and Sepia fields.
(*) Apparent differences in the sum of the numbers are due to rounding.
In 2023, we standardized the conversion between gas and oil equivalent to 5,614.65 ft3 = 1 boe, which is equivalent to the conversion used in contracts in Brazil. Quantities from previous years were restated with the new conversion.
Schedule of summary of the annual changes in the proved reserves of natural gas |
Schedule of summary of the annual changes in the proved reserves of natural gas |  |  |  |  |  |  |  |
| 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 |  | Natural Gas in North America |  | Total
At January 1, 2023 | 8,504 | 173 | − | 8,677 |  | 6 |  | 8,683
Extensions and discoveries | 779 | 15 | − | 794 |  | − |  | 794
Revisions of previous estimates | 673 | (5) | − | 668 |  | 1 |  | 669
Sales of reserves | (47) | − | − | (47) |  | − |  | (47)
Production for the year | (573) | (20) | − | (594) |  | (1) |  | (595)
Reserves at December 31, 2023 | 9,335 | 163 | − | 9,498 |  | 7 |  | 9,504
At January 1, 2022 | 7,912 | 177 | 17 | 8,106 |  | 7 |  | 8,113
Revisions of previous estimates | 1,560 | 16 | − | 1,575 |  | − |  | 1,575
Sales of reserves (1) | (382) | − | (15) | (397) |  | (1) |  | (398)
Production for the year | (586) | (20) | (1) | (606) |  | (1) |  | (607)
Reserves at December 31, 2022 | 8,504 | 173 | − | 8,677 |  | 6 |  | 8,683
At January 1, 2021 | 7,062 | 26 | − | 7,088 |  | 8 |  | 7,095
Extensions and discoveries | − | − | − | − |  | − |  | −
Revisions of previous estimates | 1,512 | 167 | 18 | 1,697 |  | − |  | 1,697
Sales of reserves | (14) | − | − | (14) |  | − |  | (14)
Production for the year | (647) | (16) | (1) | (664) |  | (1) |  | (666)
Reserves at December 31, 2021 | 7,912 | 177 | 17 | 8,106 |  | 7 |  | 8,113
(1) Includes the effects of the write-offs related to the Co-Participation Agreements of Atapu and Sepia fields.
(*) Apparent differences in the sum of the numbers are due to rounding.
In 2023, we standardized the conversion between gas and oil equivalent to 5,614.65 ft3 = 1 boe, which is equivalent to the conversion used in contracts in Brazil. Quantities from previous years were restated with the new conversion.
Schedule 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 investees |
Schedule 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 investees |  |  |  |  |  |  |  |
| 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 |  | Total
At January 1, 2023 | 10,423 | 33 | − | 10,455 |  | 17 |  | 10,473
Extensions and discoveries | 233 | 3 | − | 236 |  | − |  | 237
Revisions of previous estimates | 1,260 | (1) | − | 1,259 |  | 2 |  | 1,262
Sales of reserves | (155) | − | − | (155) |  | − |  | (155)
Production for the year | (888) | (4) | − | (892) |  | (2) |  | (894)
Reserves at December 31, 2023 | 10,873 | 31 | − | 10,904 |  | 17 |  | 10,921
At January 1, 2022 | 9,816 | 33 | 13 | 9,862 |  | 18 |  | 9,880
Revisions of previous estimates | 1,983 | 3 | − | 1,986 |  | 3 |  | 1,989
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 | 33 | − | 10,455 |  | 17 |  | 10,473
At January 1, 2021 | 8,792 | 5 | − | 8,797 |  | 19 |  | 8,816
Extensions and discoveries | − | − | − | − |  | 1 |  | 1
Revisions of previous estimates | 1,923 | 32 | 14 | 1,969 |  | 2 |  | 1,971
Sales of reserves | (11) | − | − | (11) |  | − |  | (11)
Production for the year | (888) | (3) | (1) | (892) |  | (3) |  | (896)
Reserves at December 31, 2021 | 9,816 | 33 | 13 | 9,862 |  | 18 |  | 9,880
(1) Includes the effects of the write-offs related to the Co-Participation Agreements of Atapu and Sepia fields.
(*) Apparent differences in the sum of the numbers are due to rounding.
In 2023, we standardized the conversion between gas and oil equivalent to 5,614.65 ft3 = 1 boe, which is equivalent to the conversion used in contracts in Brazil. Quantities from previous years were restated with the new conversion.
Schedule of volumes of proved developed and undeveloped reserves |
Schedule of volumes of proved developed and undeveloped reserves |  |  |  |  |
| 2023
| Crude Oil | Synthetic Oil | Natural Gas | Synthetic Gas | Total oil and gas
| (mmbbl) | (bncf) | (mmboe)
Net proved developed reserves (*): |  |  |  |  |
Consolidated Entities |  |  |  |  |
Brazil | 4,710 | − | 5,522 | − | 5,694
South America, outside Brazil (1) | 1 | − | 92 | − | 17
Total Consolidated Entities | 4,711 | − | 5,614 | − | 5,711
Equity Method Investees |  |  |  |  |
North America (1) | 14 | − | 6 | − | 15
Total Equity Method Investees | 14 | − | 6 | − | 15
Total developed Consolidated and Equity Method Investees | 4,726 | − | 5,620 | − | 5,727
Net proved undeveloped reserves (*): |  |  |  |  |
Consolidated Entities |  |  |  |  |
Brazil | 4,500 | − | 3,814 | − | 5,179
South America, outside Brazil (1) | 1 | − | 70 | − | 13
Total Consolidated Entities | 4,501 | − | 3,884 | − | 5,193
Equity Method Investees |  |  |  |  |
North America (1) | 2 | − | 1 | − | 2
Total Equity Method Investees | 2 | − | 1 | − | 2
Total undeveloped Consolidated and Equity Method Investees | 4,503 | − | 3,885 | − | 5,194
Total proved reserves (developed and undeveloped) | 9,228 | − | 9,504 | − | 10,921
(1) South America oil reserves includes 25% of natural gas liquid (NGL) in proved developed reserves and 26% of NGL in proved undeveloped reserves. North America oil reserves includes 6% of natural gas liquid (NGL) in proved developed reserves and 7% of NGL in proved undeveloped reserves.
(*) Apparent differences in the sum of the numbers are due to rounding.
In 2023, we standardized the conversion between gas and oil equivalent to 5,614.65 ft3 = 1 boe, which is equivalent to the conversion used in contracts in Brazil. Quantities from previous years were restated with the new conversion.
| 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 | − | 5,097 | − | 5,093
South America, outside Brazil (1) | 1 | − | 91 | − | 17
Total Consolidated Entities | 4,186 | − | 5,188 | − | 5,110
Equity Method Investees |  |  |  |  |
North America (1) | 14 | − | 5 | − | 15
Total Equity Method Investees | 14 | − | 5 | − | 15
Total developed Consolidated and Equity Method Investees | 4,200 | − | 5,193 | − | 5,125
Net proved undeveloped reserves (*): |  |  |  |  |
Consolidated Entities |  |  |  |  |
Brazil | 4,723 | − | 3,407 | − | 5,330
South America, outside Brazil (1) | 1 | − | 82 | − | 15
Total Consolidated Entities | 4,724 | − | 3,489 | − | 5,346
Equity Method Investees |  |  |  |  |
North America (1) | 2 | − | 1 | − | 2
Total Equity Method Investees | 2 | − | 1 | − | 2
Total undeveloped Consolidated and Equity Method Investees | 4,726 | − | 3,490 | − | 5,348
Total proved reserves (developed and undeveloped) | 8,926 | − | 8,683 | − | 10,473
(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.
In 2023, we standardized the conversion between gas and oil equivalent to 5,614.65 ft3 = 1 boe, which is equivalent to the conversion used in contracts in Brazil. Quantities from previous years were restated with the new conversion.
| 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 | 5,232 | 17 | 5,656
South America, outside Brazil (1) | 1 | − | 79 | − | 15
Total Consolidated Entities | 4,712 | 10 | 5,310 | 17 | 5,671
Equity Method Investees |  |  |  |  |
North America (1) | 15 | − | 6 | − | 16
Total Equity Method Investees | 15 | − | 6 | − | 16
Total developed Consolidated and Equity Method Investees | 4,727 | 10 | 5,316 | 17 | 5,687
Net proved undeveloped reserves (*): |  |  |  |  |
Consolidated Entities |  |  |  |  |
Brazil | 3,695 | − | 2,681 | − | 4,173
South America, outside Brazil (1) | 1 | − | 98 | − | 18
Total Consolidated Entities | 3,696 | − | 2,779 | − | 4,191
Equity Method Investees |  |  |  |  |
North America (1) | 2 | − | 1 | − | 2
Total Equity Method Investees | 2 | − | 1 | − | 2
Total undeveloped Consolidated and Equity Method Investees | 3,698 | − | 2,780 | − | 4,193
Total proved reserves (developed and undeveloped) | 8,425 | 10 | 8,096 | 17 | 9,880
(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.
In 2023, we standardized the conversion between gas and oil equivalent to 5,614.65 ft3 = 1 boe, which is equivalent to the conversion used in contracts in Brazil. Quantities from previous years were restated with the new conversion.
Schedule of standardized measure of discounted future net cash flows |
Schedule of standardized measure of discounted future net cash flows |  |  |  |
| Consolidated entities | Equity Method Investees
|  | Abroad |
| Brazil | South America | Total
December 31, 2023 |  |  |  |
Future cash inflows | 819,428 | 650 | 820,078 | 1,213
Future production costs | (348,787) | (354) | (349,142) | (191)
Future development costs | (64,121) | (113) | (64,235) | (13)
Future income tax expenses | (140,774) | (43) | (140,818) | −
Undiscounted future net cash flows | 265,745 | 139 | 265,884 | 1,009
10 percent midyear annual discount for timing of estimated cash flows (1) | (120,216) | (46) | (120,262) | (319)
Standardized measure of discounted future net cash flows | 145,529 | 93 | 145,622 | 691
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
(1) Semiannual capitalization
Apparent differences in the sum of the numbers are due to rouding.
Schedule of changes in discounted net future cash flows |
Schedule of changes in discounted net future cash flows |  |  |  |
| Consolidated entities | Equity Method Investees
|  | Abroad |
| Brazil | South America | Total
Balance at January 1, 2023 | 191,383 | 141 | 191,524 | 886
Sales and transfers of oil and gas, net of production cost | (49,797) | (54) | (49,851) | (123)
Development cost incurred | 10,929 | 53 | 10,982 | 37
Net change due to purchases and sales of minerals in place | (3,894) | − | (3,894) | −
Net change due to extensions, discoveries and improved recovery related costs | 5,858 | 19 | 5,876 | 11
Revisions of previous quantity estimates | 31,616 | 3 | 31,619 | 82
Net change in prices, transfer prices and in production costs | (63,907) | (97) | (64,004) | (201)
Changes in estimated future development costs | (16,409) | (27) | (16,436) | (17)
Accretion of discount | 19,138 | 20 | 19,159 | 68
Net change in income taxes | 20,611 | 30 | 20,641 | −
Other - unspecified | − | 5 | 5 | (53)
Balance at December 31, 2023 | 145,529 | 93 | 145,622 | 691
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
Apparent differences in the sum of the numbers are due to rounding.

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