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Oil and Gas Exploration and Production Industries Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2021
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |
Net Proved and Proved Developed Oil and Gas Reserve Quantities | The following tables set forth EOG's net proved reserves at December 31 for each of the four years in the period ended December 31, 2021, and the changes in the net proved reserves for each of the three years in the period ended December 31, 2021, as estimated by the Engineering and Acquisitions Department of EOG: NET PROVED RESERVE SUMMARY
| United States |  | Trinidad |  | Other International (1) |  | Total
NET PROVED RESERVES |  |  |  |  |  |  |
Crude Oil (MMBbl) (2) |  |  |  |  |  |  |
Net proved reserves at December 31, 2018 | 1,532 |  |  | — |  |  | — |  |  | 1,532 |
Revisions of previous estimates | (43) |  |  | — |  |  | — |  |  | (43) |
Purchases in place | 3 |  |  | — |  |  | — |  |  | 3 |
Extensions, discoveries and other additions | 370 |  |  | — |  |  | — |  |  | 370 |
Sales in place | (1) |  |  | — |  |  | — |  |  | (1) |
Production | (167) |  |  | — |  |  | — |  |  | (167) |
Net proved reserves at December 31, 2019 | 1,694 |  |  | — |  |  | — |  |  | 1,694 |
Revisions of previous estimates | (225) |  |  | — |  |  | — |  |  | (225) |
Purchases in place | 2 |  |  | — |  |  | — |  |  | 2 |
Extensions, discoveries and other additions | 194 |  |  | 1 |  |  | — |  |  | 195 |
Sales in place | (3) |  |  | — |  |  | — |  |  | (3) |
Production | (149) |  |  | — |  |  | — |  |  | (149) |
Net proved reserves at December 31, 2020 | 1,513 |  |  | 1 |  |  | — |  |  | 1,514 |
Revisions of previous estimates | (116) |  |  | — |  |  | — |  |  | (116) |
Purchases in place | 2 |  |  | — |  |  | — |  |  | 2 |
Extensions, discoveries and other additions | 311 |  |  | 1 |  |  | — |  |  | 312 |
Sales in place | (2) |  |  | — |  |  | — |  |  | (2) |
Production | (162) |  |  | — |  |  | — |  |  | (162) |
Net proved reserves at December 31, 2021 | 1,546 |  |  | 2 |  |  | — |  |  | 1,548 |
Natural Gas Liquids (MMBbl) (2) |  |  |  |  |  |  |
Net proved reserves at December 31, 2018 | 614 |  |  | — |  |  | — |  |  | 614 |
Revisions of previous estimates | 5 |  |  | — |  |  | — |  |  | 5 |
Purchases in place | 2 |  |  | — |  |  | — |  |  | 2 |
Extensions, discoveries and other additions | 168 |  |  | — |  |  | — |  |  | 168 |
Sales in place | (1) |  |  | — |  |  | — |  |  | (1) |
Production | (48) |  |  | — |  |  | — |  |  | (48) |
Net proved reserves at December 31, 2019 | 740 |  |  | — |  |  | — |  |  | 740 |
Revisions of previous estimates | (60) |  |  | — |  |  | — |  |  | (60) |
Purchases in place | 4 |  |  | — |  |  | — |  |  | 4 |
Extensions, discoveries and other additions | 180 |  |  | — |  |  | — |  |  | 180 |
Sales in place | (1) |  |  | — |  |  | — |  |  | (1) |
Production | (50) |  |  | — |  |  | — |  |  | (50) |
Net proved reserves at December 31, 2020 | 813 |  |  | — |  |  | — |  |  | 813 |
Revisions of previous estimates | (128) |  |  | — |  |  | — |  |  | (128) |
Purchases in place | 3 |  |  | — |  |  | — |  |  | 3 |
Extensions, discoveries and other additions | 194 |  |  | — |  |  | — |  |  | 194 |
Sales in place | — |  |  | — |  |  | — |  |  | — |
Production | (53) |  |  | — |  |  | — |  |  | (53) |
Net proved reserves at December 31, 2021 | 829 |  |  | — |  |  | — |  |  | 829 |
| United States |  | Trinidad |  | Other International (1) |  | Total
Natural Gas (Bcf) (3) |  |  |  |  |  |  |
Net proved reserves at December 31, 2018 | 4,391 |  |  | 237 |  |  | 59 |  |  | 4,687 |
Revisions of previous estimates | (184) |  |  | 47 |  |  | 3 |  |  | (134) |
Purchases in place | 72 |  |  | — |  |  | — |  |  | 72 |
Extensions, discoveries and other additions | 1,176 |  |  | 87 |  |  | 10 |  |  | 1,273 |
Sales in place | (15) |  |  | — |  |  | — |  |  | (15) |
Production | (405) |  |  | (95) |  |  | (13) |  |  | (513) |
Net proved reserves at December 31, 2019 | 5,035 |  |  | 276 |  |  | 59 |  |  | 5,370 |
Revisions of previous estimates | (498) |  |  | 5 |  |  | 1 |  |  | (492) |
Purchases in place | 26 |  |  | — |  |  | — |  |  | 26 |
Extensions, discoveries and other additions | 1,078 |  |  | 54 |  |  | — |  |  | 1,132 |
Sales in place | (157) |  |  | — |  |  | — |  |  | (157) |
Production | (441) |  |  | (66) |  |  | (12) |  |  | (519) |
Net proved reserves at December 31, 2020 | 5,043 |  |  | 269 |  |  | 48 |  |  | 5,360 |
Revisions of previous estimates | 754 |  |  | 26 |  |  | 3 |  |  | 783 |
Purchases in place | 23 |  |  | — |  |  | — |  |  | 23 |
Extensions, discoveries and other additions | 2,574 |  |  | 100 |  |  | — |  |  | 2,674 |
Sales in place | (4) |  |  | — |  |  | (48) |  |  | (52) |
Production | (483) |  |  | (80) |  |  | (3) |  |  | (566) |
Net proved reserves at December 31, 2021 | 7,907 |  |  | 315 |  |  | — |  |  | 8,222 |
Oil Equivalents (MMBoe) (2) |  |  |  |  |  |  |
Net proved reserves at December 31, 2018 | 2,878 |  |  | 40 |  |  | 10 |  |  | 2,928 |
Revisions of previous estimates | (68) |  |  | 8 |  |  | — |  |  | (60) |
Purchases in place | 17 |  |  | — |  |  | — |  |  | 17 |
Extensions, discoveries and other additions | 734 |  |  | 14 |  |  | 2 |  |  | 750 |
Sales in place | (5) |  |  | — |  |  | — |  |  | (5) |
Production | (283) |  |  | (16) |  |  | (2) |  |  | (301) |
Net proved reserves at December 31, 2019 | 3,273 |  |  | 46 |  |  | 10 |  |  | 3,329 |
Revisions of previous estimates | (368) |  |  | 1 |  |  | — |  |  | (367) |
Purchases in place | 10 |  |  | — |  |  | — |  |  | 10 |
Extensions, discoveries and other additions | 554 |  |  | 10 |  |  | — |  |  | 564 |
Sales in place | (31) |  |  | — |  |  | — |  |  | (31) |
Production | (272) |  |  | (11) |  |  | (2) |  |  | (285) |
Net proved reserves at December 31, 2020 | 3,166 |  |  | 46 |  |  | 8 |  |  | 3,220 |
Revisions of previous estimates | (118) |  |  | 4 |  |  | — |  |  | (114) |
Purchases in place | 9 |  |  | — |  |  | — |  |  | 9 |
Extensions, discoveries and other additions | 934 |  |  | 18 |  |  | — |  |  | 952 |
Sales in place | (3) |  |  | — |  |  | (8) |  |  | (11) |
Production | (295) |  |  | (14) |  |  | — |  |  | (309) |
Net proved reserves at December 31, 2021 | 3,693 |  |  | 54 |  |  | — |  |  | 3,747 |
(1)Other International includes EOG's China and Canada operations. The China operations were sold in the second quarter of 2021. (2)Million barrels or million barrels of oil equivalent, as applicable; oil equivalents include crude oil and condensate, NGLs and natural gas. Oil equivalents are determined using a ratio of 1.0 barrel of crude oil and condensate or NGLs to 6.0 thousand cubic feet of natural gas. (3)Billion cubic feet.
Net Proved Developed and Net Proved Undeveloped Oil and Gas Reserve Quantities |
| United States |  | Trinidad |  | Other International (1) |  | Total
NET PROVED DEVELOPED RESERVES |  |  |  |  |  |  |
Crude Oil (MMBbl) |  |  |  |  |  |  |
December 31, 2018 | 713 |  |  | — |  |  | — |  |  | 713 |
December 31, 2019 | 801 |  |  | — |  |  | — |  |  | 801 |
December 31, 2020 | 792 |  |  | 1 |  |  | — |  |  | 793 |
December 31, 2021 | 886 |  |  | — |  |  | — |  |  | 886 |
Natural Gas Liquids (MMBbl) |  |  |  |  |  |  |
December 31, 2018 | 341 |  |  | — |  |  | — |  |  | 341 |
December 31, 2019 | 387 |  |  | — |  |  | — |  |  | 387 |
December 31, 2020 | 392 |  |  | — |  |  | — |  |  | 392 |
December 31, 2021 | 416 |  |  | — |  |  | — |  |  | 416 |
Natural Gas (Bcf) |  |  |  |  |  |  |
December 31, 2018 | 2,699 |  |  | 224 |  |  | 41 |  |  | 2,964 |
December 31, 2019 | 2,974 |  |  | 178 |  |  | 42 |  |  | 3,194 |
December 31, 2020 | 2,586 |  |  | 171 |  |  | 32 |  |  | 2,789 |
December 31, 2021 | 3,743 |  |  | 131 |  |  | — |  |  | 3,874 |
Oil Equivalents (MMBoe) |  |  |  |  |  |  |
December 31, 2018 | 1,503 |  |  | 38 |  |  | 7 |  |  | 1,548 |
December 31, 2019 | 1,684 |  |  | 30 |  |  | 7 |  |  | 1,721 |
December 31, 2020 | 1,614 |  |  | 30 |  |  | 5 |  |  | 1,649 |
December 31, 2021 | 1,926 |  |  | 22 |  |  | — |  |  | 1,948 |
NET PROVED UNDEVELOPED RESERVES |  |  |  |  |  |  |
Crude Oil (MMBbl) |  |  |  |  |  |  |
December 31, 2018 | 819 |  |  | — |  |  | — |  |  | 819 |
December 31, 2019 | 893 |  |  | — |  |  | — |  |  | 893 |
December 31, 2020 | 721 |  |  | — |  |  | — |  |  | 721 |
December 31, 2021 | 660 |  |  | 2 |  |  | — |  |  | 662 |
Natural Gas Liquids (MMBbl) |  |  |  |  |  |  |
December 31, 2018 | 273 |  |  | — |  |  | — |  |  | 273 |
December 31, 2019 | 353 |  |  | — |  |  | — |  |  | 353 |
December 31, 2020 | 421 |  |  | — |  |  | — |  |  | 421 |
December 31, 2021 | 413 |  |  | — |  |  | — |  |  | 413 |
Natural Gas (Bcf) |  |  |  |  |  |  |
December 31, 2018 | 1,692 |  |  | 13 |  |  | 18 |  |  | 1,723 |
December 31, 2019 | 2,061 |  |  | 98 |  |  | 17 |  |  | 2,176 |
December 31, 2020 | 2,457 |  |  | 98 |  |  | 16 |  |  | 2,571 |
December 31, 2021 | 4,164 |  |  | 184 |  |  | — |  |  | 4,348 |
Oil Equivalents (MMBoe) |  |  |  |  |  |  |
December 31, 2018 | 1,375 |  |  | 2 |  |  | 3 |  |  | 1,380 |
December 31, 2019 | 1,589 |  |  | 16 |  |  | 3 |  |  | 1,608 |
December 31, 2020 | 1,552 |  |  | 16 |  |  | 3 |  |  | 1,571 |
December 31, 2021 | 1,767 |  |  | 32 |  |  | — |  |  | 1,799 |
(1)Other International includes EOG's China and Canada operations. The China operations were sold in the second quarter of 2021.
Net Proved Undeveloped Reserves | The following table presents the changes in EOG's total PUDs during 2021, 2020 and 2019 (in MMBoe):
| 2021 |  | 2020 |  | 2019
Balance at January 1 | 1,571 |  |  | 1,608 |  |  | 1,380 |
Extensions and Discoveries | 779 |  |  | 456 |  |  | 578 |
Revisions | (305) |  |  | (277) |  |  | (50) |
Acquisition of Reserves | — |  |  | — |  |  | 2 |
Sale of Reserves | (3) |  |  | (4) |  |  | — |
Conversion to Proved Developed Reserves | (243) |  |  | (212) |  |  | (302) |
Balance at December 31 | 1,799 |  |  | 1,571 |  |  | 1,608 |
Capitalized Costs Relating to Oil and Gas Producing Activities | The following table sets forth the capitalized costs relating to EOG's crude oil, NGLs and natural gas producing activities at December 31, 2021 and 2020:
| 2021 |  | 2020
Proved properties | $ | 64,876 |  |  | $ | 61,725 |
Unproved properties | 2,768 |  |  | 3,068 |
Total | 67,644 |  |  | 64,793 |
Accumulated depreciation, depletion and amortization | (41,907) |  |  | (38,751) |
Net capitalized costs | $ | 25,737 |  |  | $ | 26,042 |
Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities | The following table sets forth costs incurred related to EOG's oil and gas activities for the years ended December 31, 2021, 2020 and 2019:
| United States |  | Trinidad |  | Other International (1) |  | Total
2021 |  |  |  |  |  |  |
Acquisition Costs of Properties |  |  |  |  |  |  |
Unproved (2) | $ | 207 |  |  | $ | — |  |  | $ | 8 |  |  | $ | 215 |
Proved (3) | 100 |  |  | — |  |  | — |  |  | 100 |
Subtotal | 307 |  |  | — |  |  | 8 |  |  | 315 |
Exploration Costs | 296 |  |  | 7 |  |  | 51 |  |  | 354 |
Development Costs (4) | 3,206 |  |  | 77 |  |  | 17 |  |  | 3,300 |
Total | $ | 3,809 |  |  | $ | 84 |  |  | $ | 76 |  |  | $ | 3,969 |
2020 |  |  |  |  |  |  |
Acquisition Costs of Properties |  |  |  |  |  |  |
Unproved (5) | $ | 265 |  |  | $ | — |  |  | $ | — |  |  | $ | 265 |
Proved (6) | 97 |  |  | — |  |  | 38 |  |  | 135 |
Subtotal | 362 |  |  | — |  |  | 38 |  |  | 400 |
Exploration Costs | 203 |  |  | 81 |  |  | 12 |  |  | 296 |
Development Costs (7) | 2,998 |  |  | 4 |  |  | 20 |  |  | 3,022 |
Total | $ | 3,563 |  |  | $ | 85 |  |  | $ | 70 |  |  | $ | 3,718 |
2019 |  |  |  |  |  |  |
Acquisition Costs of Properties |  |  |  |  |  |  |
Unproved (8) | $ | 276 |  |  | $ | — |  |  | $ | — |  |  | $ | 276 |
Proved (9) | 380 |  |  | — |  |  | — |  |  | 380 |
Subtotal | 656 |  |  | — |  |  | — |  |  | 656 |
Exploration Costs | 214 |  |  | 47 |  |  | 12 |  |  | 273 |
Development Costs (10) | 5,662 |  |  | 25 |  |  | 12 |  |  | 5,699 |
Total | $ | 6,532 |  |  | $ | 72 |  |  | $ | 24 |  |  | $ | 6,628 |
(1)Other International primarily consists of EOG's China and Canada operations. The China operations were sold in the second quarter of 2021. EOG began exploration programs in Australia in the third quarter of 2021 and in Oman in the third quarter of 2020. The decision was reached in the fourth quarter of 2021 to exit Block 36 and Block 49 in Oman. (2)Includes non-cash unproved leasehold acquisition costs of $45 million related to property exchanges. (3)Includes non-cash proved property acquisition costs of $5 million related to property exchanges. (4)Includes Asset Retirement Costs of $86 million, $24 million and $17 million for the United States, Trinidad and Other International, respectively. Excludes other property, plant and equipment. (5)Includes non-cash unproved leasehold acquisition costs of $197 million related to property exchanges. (6)Includes non-cash proved property acquisition costs of $15 million related to property exchanges. (7)Includes Asset Retirement Costs of $97 million and $20 million for the United States and Other International, respectively. Excludes other property, plant and equipment. (8)Includes non-cash unproved leasehold acquisition costs of $98 million related to property exchanges. (9)Includes non-cash proved property acquisition costs of $52 million related to property exchanges. (10)Includes Asset Retirement Costs of $181 million, $1 million and $4 million for the United States, Trinidad and Other International, respectively. Excludes other property, plant and equipment.
Results of Operations for Oil and Gas Producing Activities | esults of Operations for Oil and Gas Producing Activities (1). The following table sets forth results of operations for oil and gas producing activities for the years ended December 31, 2021, 2020 and 2019:
| United States |  | Trinidad |  | Other International (2) |  | Total
2021 |  |  |  |  |  |  |
Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues | $ | 15,062 |  |  | $ | 301 |  |  | $ | 18 |  |  | $ | 15,381 |
Other | 108 |  |  | — |  |  | — |  |  | 108 |
Total | 15,170 |  |  | 301 |  |  | 18 |  |  | 15,489 |
Exploration Costs | 137 |  |  | 5 |  |  | 12 |  |  | 154 |
Dry Hole Costs | 29 |  |  | — |  |  | 42 |  |  | 71 |
Transportation Costs | 863 |  |  | — |  |  | — |  |  | 863 |
Gathering and Processing Costs | 559 |  |  | — |  |  | — |  |  | 559 |
Production Costs | 2,108 |  |  | 39 |  |  | 8 |  |  | 2,155 |
Impairments | 312 |  |  | 3 |  |  | 61 |  |  | 376 |
Depreciation, Depletion and Amortization | 3,411 |  |  | 87 |  |  | 6 |  |  | 3,504 |
Income (Loss) Before Income Taxes | 7,751 |  |  | 167 |  |  | (111) |  |  | 7,807 |
Income Tax Provision | 1,690 |  |  | 73 |  |  | (1) |  |  | 1,762 |
Results of Operations | $ | 6,061 |  |  | $ | 94 |  |  | $ | (110) |  |  | $ | 6,045 |
2020 |  |  |  |  |  |  |
Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues | $ | 7,056 |  |  | $ | 180 |  |  | $ | 55 |  |  | $ | 7,291 |
Other | 60 |  |  | — |  |  | — |  |  | 60 |
Total | 7,116 |  |  | 180 |  |  | 55 |  |  | 7,351 |
Exploration Costs | 136 |  |  | 2 |  |  | 8 |  |  | 146 |
Dry Hole Costs | 13 |  |  | — |  |  | — |  |  | 13 |
Transportation Costs | 734 |  |  | 1 |  |  | — |  |  | 735 |
Gathering and Processing Costs | 459 |  |  | — |  |  | — |  |  | 459 |
Production Costs | 1,480 |  |  | 27 |  |  | 10 |  |  | 1,517 |
Impairments | 2,018 |  |  | 1 |  |  | 81 |  |  | 2,100 |
Depreciation, Depletion and Amortization | 3,192 |  |  | 60 |  |  | 16 |  |  | 3,268 |
Income (Loss) Before Income Taxes | (916) |  |  | 89 |  |  | (60) |  |  | (887) |
Income Tax Provision | (220) |  |  | 24 |  |  | 3 |  |  | (193) |
Results of Operations | $ | (696) |  |  | $ | 65 |  |  | $ | (63) |  |  | $ | (694) |
2019 |  |  |  |  |  |  |
Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues | $ | 11,251 |  |  | $ | 270 |  |  | $ | 61 |  |  | $ | 11,582 |
Other | 134 |  |  | — |  |  | — |  |  | 134 |
Total | 11,385 |  |  | 270 |  |  | 61 |  |  | 11,716 |
Exploration Costs | 130 |  |  | 4 |  |  | 6 |  |  | 140 |
Dry Hole Costs | 11 |  |  | 13 |  |  | 4 |  |  | 28 |
Transportation Costs | 753 |  |  | 4 |  |  | 1 |  |  | 758 |
Gathering and Processing Costs | 479 |  |  | — |  |  | — |  |  | 479 |
Production Costs | 2,063 |  |  | 31 |  |  | 40 |  |  | 2,134 |
Impairments | 511 |  |  | 6 |  |  | 1 |  |  | 518 |
Depreciation, Depletion and Amortization | 3,561 |  |  | 79 |  |  | 18 |  |  | 3,658 |
Income (Loss) Before Income Taxes | 3,877 |  |  | 133 |  |  | (9) |  |  | 4,001 |
Income Tax Provision | 884 |  |  | 55 |  |  | 3 |  |  | 942 |
Results of Operations | $ | 2,993 |  |  | $ | 78 |  |  | $ | (12) |  |  | $ | 3,059 |
(1)Excludes gains or losses on the mark-to-market of financial commodity derivative contracts, gains or losses on sales of reserves and related assets, interest charges and general corporate expenses for each of the three years in the period ended December 31, 2021. (2)Other International primarily consists of EOG's China and Canada operations. The China operations were sold in the second quarter of 2021. EOG began exploration programs in Australia in the third quarter of 2021 and in Oman in the third quarter of 2020. The decision was reached in the fourth quarter of 2021 to exit Block 36 and Block 49 in Oman.
Production Costs Per Barrel of Oil Equivalent | The following table sets forth production costs per barrel of oil equivalent, excluding severance/production and ad valorem taxes, for the years ended December 31, 2021, 2020 and 2019:
| United States |  | Trinidad |  | Other International (1) |  | Composite
Year Ended December 31, 2021 | $ | 3.71 |  |  | $ | 2.32 |  |  | $ | 16.13 |  |  | $ | 3.67 |
Year Ended December 31, 2020 | $ | 3.75 |  |  | $ | 2.33 |  |  | $ | 6.78 |  |  | $ | 3.72 |
Year Ended December 31, 2019 | $ | 4.59 |  |  | $ | 1.85 |  |  | $ | 18.26 |  |  | $ | 4.54 |
(1) Other International primarily consists of EOG's China and Canada operations. The China operations were sold in the second quarter of 2021.
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves Table | The following table sets forth the standardized measure of discounted future net cash flows from projected production of EOG's oil and gas reserves for the years ended December 31, 2021, 2020 and 2019:
| United States |  | Trinidad |  | Other International (1) |  | Total
2021 |  |  |  |  |  |  |
Future cash inflows (2) | $ | 166,316 |  |  | $ | 1,135 |  |  | $ | — |  |  | $ | 167,451 |
Future production costs | (44,905) |  |  | (258) |  |  | — |  |  | (45,163) |
Future development costs | (13,885) |  |  | (380) |  |  | — |  |  | (14,265) |
Future income taxes | (22,831) |  |  | (84) |  |  | — |  |  | (22,915) |
Future net cash flows | 84,695 |  |  | 413 |  |  | — |  |  | 85,108 |
Discount to present value at 10% annual rate | (38,834) |  |  | (88) |  |  | — |  |  | (38,922) |
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves | $ | 45,861 |  |  | $ | 325 |  |  | $ | — |  |  | $ | 46,186 |
2020 |  |  |  |  |  |  |
Future cash inflows (3) | $ | 73,727 |  |  | $ | 901 |  |  | $ | 281 |  |  | $ | 74,909 |
Future production costs | (34,619) |  |  | (153) |  |  | (54) |  |  | (34,826) |
Future development costs | (15,159) |  |  | (227) |  |  | (18) |  |  | (15,404) |
Future income taxes | (4,337) |  |  | (81) |  |  | (24) |  |  | (4,442) |
Future net cash flows | 19,612 |  |  | 440 |  |  | 185 |  |  | 20,237 |
Discount to present value at 10% annual rate | (8,410) |  |  | (101) |  |  | (36) |  |  | (8,547) |
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves | $ | 11,202 |  |  | $ | 339 |  |  | $ | 149 |  |  | $ | 11,690 |
2019 |  |  |  |  |  |  |
Future cash inflows (4) | $ | 120,360 |  |  | $ | 813 |  |  | $ | 305 |  |  | $ | 121,478 |
Future production costs | (42,387) |  |  | (166) |  |  | (88) |  |  | (42,641) |
Future development costs | (20,356) |  |  | (212) |  |  | (18) |  |  | (20,586) |
Future income taxes | (11,460) |  |  | (74) |  |  | (32) |  |  | (11,566) |
Future net cash flows | 46,157 |  |  | 361 |  |  | 167 |  |  | 46,685 |
Discount to present value at 10% annual rate | (21,043) |  |  | (86) |  |  | (35) |  |  | (21,164) |
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves | $ | 25,114 |  |  | $ | 275 |  |  | $ | 132 |  |  | $ | 25,521 |
(1)Other International includes EOG's China and Canada operations. The China operations were sold in the second quarter of 2021. (2)Estimated crude oil prices used to calculate 2021 future cash inflows for the United States and Trinidad were $67.79 and $58.32, respectively. Estimated NGL price used to calculate 2021 future cash inflows for the United States was $30.28. Estimated natural gas prices used to calculate 2021 future cash inflows for the United States and Trinidad were $4.61 and $3.28, respectively. (3)Estimated crude oil prices used to calculate 2020 future cash inflows for the United States, Trinidad and Other International were $37.19, $26.75, and $41.87, respectively. Estimated NGL price used to calculate 2020 future cash inflows for the United States was $12.47. Estimated natural gas prices used to calculate 2020 future cash inflows for the United States, Trinidad and Other International were $1.45, $3.28, and $5.65, respectively. (4)Estimated crude oil prices used to calculate 2019 future cash inflows for the United States, Trinidad and Other International were $57.51, $46.77 and $57.22, respectively. Estimated NGL price used to calculate 2019 future cash inflows for the United States was $16.91. Estimated natural gas prices used to calculate 2019 future cash inflows for the United States, Trinidad and Other International were $2.07, $2.90 and $5.01, respectively.
Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves | The following table sets forth the changes in the standardized measure of discounted future net cash flows at December 31, for each of the three years in the period ended December 31, 2021:
| United States |  | Trinidad |  | Other International (1) |  | Total
December 31, 2018 | $ | 32,033 |  |  | $ | 266 |  |  | $ | 127 |  |  | $ | 32,426 |
Sales and transfers of oil and gas produced, net of production costs | (7,955) |  |  | (235) |  |  | (20) |  |  | (8,210) |
Net changes in prices and production costs | (10,974) |  |  | 66 |  |  | 28 |  |  | (10,880) |
Extensions, discoveries, additions and improved recovery, net of related costs | 5,608 |  |  | 85 |  |  | 16 |  |  | 5,709 |
Development costs incurred | 3,004 |  |  | 23 |  |  | 6 |  |  | 3,033 |
Revisions of estimated development cost | (599) |  |  | (129) |  |  | (11) |  |  | (739) |
Revisions of previous quantity estimates | (813) |  |  | 116 |  |  | 1 |  |  | (696) |
Accretion of discount | 3,892 |  |  | 43 |  |  | 15 |  |  | 3,950 |
Net change in income taxes | 1,454 |  |  | 94 |  |  | 1 |  |  | 1,549 |
Purchases of reserves in place | 99 |  |  | — |  |  | — |  |  | 99 |
Sales of reserves in place | (51) |  |  | — |  |  | — |  |  | (51) |
Changes in timing and other | (584) |  |  | (54) |  |  | (31) |  |  | (669) |
December 31, 2019 | $ | 25,114 |  |  | $ | 275 |  |  | $ | 132 |  |  | $ | 25,521 |
Sales and transfers of oil and gas produced, net of production costs | (4,382) |  |  | (152) |  |  | (45) |  |  | (4,579) |
Net changes in prices and production costs | (18,625) |  |  | 132 |  |  | 47 |  |  | (18,446) |
Extensions, discoveries, additions and improved recovery, net of related costs | 1,437 |  |  | 64 |  |  | — |  |  | 1,501 |
Development costs incurred | 1,675 |  |  | — |  |  | — |  |  | 1,675 |
Revisions of estimated development cost | 4,149 |  |  | (11) |  |  | — |  |  | 4,138 |
Revisions of previous quantity estimates | (3,307) |  |  | 12 |  |  | (2) |  |  | (3,297) |
Accretion of discount | 3,055 |  |  | 34 |  |  | 15 |  |  | 3,104 |
Net change in income taxes | 3,497 |  |  | (12) |  |  | 3 |  |  | 3,488 |
Purchases of reserves in place | 49 |  |  | — |  |  | — |  |  | 49 |
Sales of reserves in place | (156) |  |  | — |  |  | — |  |  | (156) |
Changes in timing and other | (1,304) |  |  | (3) |  |  | (1) |  |  | (1,308) |
December 31, 2020 | $ | 11,202 |  |  | $ | 339 |  |  | $ | 149 |  |  | $ | 11,690 |
Sales and transfers of oil and gas produced, net of production costs | (11,532) |  |  | (261) |  |  | (16) |  |  | (11,809) |
Net changes in prices and production costs | 37,088 |  |  | 133 |  |  | (1) |  |  | 37,220 |
Extensions, discoveries, additions and improved recovery, net of related costs | 12,154 |  |  | 71 |  |  | — |  |  | 12,225 |
Development costs incurred | 1,619 |  |  | 16 |  |  | — |  |  | 1,635 |
Revisions of estimated development cost | 2,773 |  |  | (133) |  |  | — |  |  | 2,640 |
Revisions of previous quantity estimates | (1,789) |  |  | 73 |  |  | — |  |  | (1,716) |
Accretion of discount | 1,313 |  |  | 42 |  |  | 17 |  |  | 1,372 |
Net change in income taxes | (9,914) |  |  | 27 |  |  | 17 |  |  | (9,870) |
Purchases of reserves in place | 151 |  |  | — |  |  | — |  |  | 151 |
Sales of reserves in place | (19) |  |  | — |  |  | (151) |  |  | (170) |
Changes in timing and other | 2,815 |  |  | 18 |  |  | (15) |  |  | 2,818 |
December 31, 2021 | $ | 45,861 |  |  | $ | 325 |  |  | $ | — |  |  | $ | 46,186 |
(1) Other International includes EOG's China and Canada operations. The China operations were sold in the second quarter of 2021.

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