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v3.19.3.a.u2

Oil and Gas Exploration and Production Industries Disclosures (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) MBoe MBbls MMcf | Dec. 31, 2018 USD ($) MBoe MBbls MMcf | Dec. 31, 2017 MBoe MBbls MMcf | Dec. 31, 2016 MBoe MBbls MMcf
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves (MBOE) | MBoe |  | 1,721,212 | 1,548,137 | 1,364,335 | 1,093,906
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Balance at January 1 | MBoe |  | 1,379,709 | 1,162,635 | 1,053,027 |
Extensions and Discoveries | MBoe |  | 578,317 | 490,725 | 237,378 |
Revisions | MBoe |  | (49,837) | (8,244) | 33,127 |
Acquisition of Reserves | MBoe |  | 1,711 | 311 | 0 |
Sales of Reserves | MBoe |  | 0 | 0 | (8,253) |
Conversion to Proved Developed Reserves | MBoe |  | (302,044) | (265,718) | (152,644) |
Balance at December 31 | MBoe |  | 1,607,856 | 1,379,709 | 1,162,635 |
Capitalized Costs, Oil and Gas Producing Activities, Gross [Abstract] |  |  |  |  |
Proved properties | $ |  | $ 59,229,686 | $ 53,624,809 |  |
Unproved properties | $ |  | 3,600,729 | 3,705,207 |  |
Total | $ |  | 62,830,415 | 57,330,016 |  |
Accumulated depreciation, depletion and amortization | $ |  | (35,033,085) | (31,674,085) |  |
Net capitalized costs | $ |  | $ 27,797,330 | $ 25,655,931 |  |
Crude Oil (MBbl) |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | [1] | 1,532,312 | 1,312,973 | 1,177,585 |
Revisions of previous estimates | [1] | (42,882) | (13,376) | 57,836 |
Purchases in place | [1] | 2,859 | 2,743 | 1,111 |
Extensions, discoveries and other additions | [1] | 369,996 | 383,018 | 207,557 |
Sales in place | [1] | (1,282) | (7,078) | (8,393) |
Production | [1] | (166,586) | (145,968) | (122,723) |
Net proved reserves - end of period | [1] | 1,694,417 | 1,532,312 | 1,312,973 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves |  | 801,598 | 712,785 | 614,236 | 516,625
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves |  | 892,819 | 819,527 | 698,737 | 660,690
Natural Gas Liquids |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | [1] | 614,329 | 503,473 | 416,366 |
Revisions of previous estimates | [1] | 5,380 | 23,942 | 46,843 |
Purchases in place | [1] | 1,948 | 2,006 | 421 |
Extensions, discoveries and other additions | [1] | 167,782 | 127,409 | 75,003 |
Sales in place | [1] | (855) | (41) | (2,887) |
Production | [1] | (48,892) | (42,460) | (32,273) |
Net proved reserves - end of period | [1] | 739,692 | 614,329 | 503,473 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves |  | 387,253 | 341,386 | 286,872 | 230,219
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves |  | 352,439 | 272,943 | 216,601 | 186,147
Natural Gas (MMcf) |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | MMcf | [2] | 4,687,200 | 4,263,100 | 3,317,900 |
Revisions of previous estimates | MMcf | [2] | (134,800) | (91,500) | 584,000.0 |
Purchases in place | MMcf | [2] | 71,700 | 41,300 | 4,800 |
Extensions, discoveries and other additions | MMcf | [2] | 1,273,100 | 956,000.0 | 829,400 |
Sales in place | MMcf | [2] | (14,500) | (22,200) | (56,400) |
Production | MMcf | [2] | (513,000.0) | (459,500) | (416,600) |
Net proved reserves - end of period | MMcf | [2] | 5,369,700 | 4,687,200 | 4,263,100 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves | MMcf |  | 3,194,100 | 2,963,800 | 2,779,300 | 2,082,400
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves | MMcf |  | 2,175,600 | 1,723,400 | 1,483,800 | 1,235,500
Oil Equivalents (MBoe) |  |  |  |  |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved reserves - beginning of period | MBoe | [1] | 2,927,846 | 2,526,970 | 2,146,933 |
Revisions of previous estimates | MBoe | [1] | (59,971) | (4,684) | 202,018 |
Purchases in place | MBoe | [1] | 16,761 | 11,640 | 2,332 |
Extensions, discoveries and other additions | MBoe | [1] | 749,968 | 669,750 | 420,798 |
Sales in place | MBoe | [1] | (4,555) | (10,819) | (20,687) |
Production | MBoe | [1] | (300,981) | (265,011) | (224,424) |
Net proved reserves - end of period | MBoe | [1] | 3,329,068 | 2,927,846 | 2,526,970 |
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserve (MBOE) | MBoe |  | 1,607,856 | 1,379,709 | 1,162,635 | 1,053,027
United States |  |  |  |  |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves (MBOE) | MBoe |  | 1,684,209 | 1,503,441 | 1,300,758 | 1,038,483
United States | Crude Oil (MBbl) |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | [1] | 1,531,684 | 1,304,071 | 1,168,491 |
Revisions of previous estimates | [1] | (42,959) | (13,237) | 57,935 |
Purchases in place | [1] | 2,859 | 2,743 | 1,111 |
Extensions, discoveries and other additions | [1] | 369,968 | 383,003 | 207,137 |
Sales in place | [1] | (1,282) | (768) | (8,393) |
Production | [1] | (166,310) | (144,128) | (122,210) |
Net proved reserves - end of period | [1] | 1,693,960 | 1,531,684 | 1,304,071 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves |  | 801,189 | 712,218 | 605,405 | 507,531
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves |  | 892,771 | 819,466 | 698,666 | 660,690
United States | Natural Gas Liquids |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | [1] | 614,329 | 503,473 | 416,366 |
Revisions of previous estimates | [1] | 5,380 | 23,942 | 46,843 |
Purchases in place | [1] | 1,948 | 2,006 | 421 |
Extensions, discoveries and other additions | [1] | 167,782 | 127,409 | 75,003 |
Sales in place | [1] | (855) | (41) | (2,887) |
Production | [1] | (48,892) | (42,460) | (32,273) |
Net proved reserves - end of period | [1] | 739,692 | 614,329 | 503,473 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves |  | 387,253 | 341,386 | 286,872 | 230,219
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves |  | 352,439 | 272,943 | 216,601 | 186,147
United States | Natural Gas (MMcf) |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | MMcf | [2] | 4,390,600 | 3,898,500 | 3,021,200 |
Revisions of previous estimates | MMcf | [2] | (184,400) | (127,200) | 602,800 |
Purchases in place | MMcf | [2] | 71,700 | 41,300 | 4,800 |
Extensions, discoveries and other additions | MMcf | [2] | 1,175,900 | 951,400 | 619,300 |
Sales in place | MMcf | [2] | (14,500) | (22,200) | (56,400) |
Production | MMcf | [2] | (404,500) | (351,200) | (293,200) |
Net proved reserves - end of period | MMcf | [2] | 5,034,800 | 4,390,600 | 3,898,500 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves | MMcf |  | 2,974,600 | 2,699,000.0 | 2,450,800 | 1,804,400
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves | MMcf |  | 2,060,200 | 1,691,600 | 1,447,700 | 1,216,800
United States | Oil Equivalents (MBoe) |  |  |  |  |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved reserves - beginning of period | MBoe | [1] | 2,877,778 | 2,457,302 | 2,088,392 |
Revisions of previous estimates | MBoe | [1] | (68,317) | (10,500) | 205,262 |
Purchases in place | MBoe | [1] | 16,761 | 11,640 | 2,332 |
Extensions, discoveries and other additions | MBoe | [1] | 733,730 | 668,972 | 385,354 |
Sales in place | MBoe | [1] | (4,555) | (4,509) | (20,687) |
Production | MBoe | [1] | (282,619) | (245,127) | (203,351) |
Net proved reserves - end of period | MBoe | [1] | 3,272,778 | 2,877,778 | 2,457,302 |
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserve (MBOE) | MBoe |  | 1,588,569 | 1,374,337 | 1,156,544 | 1,049,909
Trinidad |  |  |  |  |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves (MBOE) | MBoe |  | 29,886 | 37,746 | 50,779 | 44,543
Trinidad | Crude Oil (MBbl) |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | [1] | 417 | 898 | 839 |
Revisions of previous estimates | [1] | 85 | (183) | 80 |
Purchases in place | [1] | 0 | 0 | 0 |
Extensions, discoveries and other additions | [1] | 0 | 0 | 301 |
Sales in place | [1] | 0 | 0 | 0 |
Production | [1] | (236) | (298) | (322) |
Net proved reserves - end of period | [1] | 266 | 417 | 898 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves |  | 266 | 417 | 898 | 839
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves |  | 0 | 0 | 0 | 0
Trinidad | Natural Gas Liquids |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | [1] | 0 | 0 | 0 |
Revisions of previous estimates | [1] | 0 | 0 | 0 |
Purchases in place | [1] | 0 | 0 | 0 |
Extensions, discoveries and other additions | [1] | 0 | 0 | 0 |
Sales in place | [1] | 0 | 0 | 0 |
Production | [1] | 0 | 0 | 0 |
Net proved reserves - end of period | [1] | 0 | 0 | 0 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves |  | 0 | 0 | 0 | 0
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves |  | 0 | 0 | 0 | 0
Trinidad | Natural Gas (MMcf) |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | MMcf | [2] | 237,000.0 | 313,400 | 280,900 |
Revisions of previous estimates | MMcf | [2] | 47,000.0 | 20,700 | (27,400) |
Purchases in place | MMcf | [2] | 0 | 0 | 0 |
Extensions, discoveries and other additions | MMcf | [2] | 87,500 | 0 | 174,200 |
Sales in place | MMcf | [2] | 0 | 0 | 0 |
Production | MMcf | [2] | (95,400) | (97,100) | (114,300) |
Net proved reserves - end of period | MMcf | [2] | 276,100 | 237,000.0 | 313,400 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves | MMcf |  | 177,700 | 223,900 | 299,200 | 262,200
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves | MMcf |  | 98,400 | 13,100 | 14,200 | 18,700
Trinidad | Oil Equivalents (MBoe) |  |  |  |  |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved reserves - beginning of period | MBoe | [1] | 39,936 | 53,142 | 47,661 |
Revisions of previous estimates | MBoe | [1] | 7,915 | 3,272 | (4,493) |
Purchases in place | MBoe | [1] | 0 | 0 | 0 |
Extensions, discoveries and other additions | MBoe | [1] | 14,577 | 0 | 29,340 |
Sales in place | MBoe | [1] | 0 | 0 | 0 |
Production | MBoe | [1] | (16,130) | (16,478) | (19,366) |
Net proved reserves - end of period | MBoe | [1] | 46,298 | 39,936 | 53,142 |
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserve (MBOE) | MBoe |  | 16,412 | 2,190 | 2,363 | 3,118
Other International |  |  |  |  |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves (MBOE) | MBoe | [3] | 7,117 | 6,950 | 12,798 | 10,880
Other International | Crude Oil (MBbl) |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | [1],[3] | 211 | 8,004 | 8,255 |
Revisions of previous estimates | [1],[3] | (8) | 44 | (179) |
Purchases in place | [1],[3] | 0 | 0 | 0 |
Extensions, discoveries and other additions | [1],[3] | 28 | 15 | 119 |
Sales in place | [1],[3] | 0 | (6,310) | 0 |
Production | [1],[3] | (40) | (1,542) | (191) |
Net proved reserves - end of period | [1],[3] | 191 | 211 | 8,004 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves | [3] | 143 | 150 | 7,933 | 8,255
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves | [3] | 48 | 61 | 71 | 0
Other International | Natural Gas Liquids |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | [1],[3] | 0 | 0 | 0 |
Revisions of previous estimates | [1],[3] | 0 | 0 | 0 |
Purchases in place | [1],[3] | 0 | 0 | 0 |
Extensions, discoveries and other additions | [1],[3] | 0 | 0 | 0 |
Sales in place | [1],[3] | 0 | 0 | 0 |
Production | [1],[3] | 0 | 0 | 0 |
Net proved reserves - end of period | [1],[3] | 0 | 0 | 0 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves | [3] | 0 | 0 | 0 | 0
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves | [3] | 0 | 0 | 0 | 0
Other International | Natural Gas (MMcf) |  |  |  |  |
Proved Developed Reserves [Rollforward] |  |  |  |  |
Net proved reserves - beginning of period | MMcf | [2],[3] | 59,600 | 51,200 | 15,800 |
Revisions of previous estimates | MMcf | [2],[3] | 2,600 | 15,000.0 | 8,600 |
Purchases in place | MMcf | [2],[3] | 0 | 0 | 0 |
Extensions, discoveries and other additions | MMcf | [2],[3] | 9,700 | 4,600 | 35,900 |
Sales in place | MMcf | [2],[3] | 0 | 0 | 0 |
Production | MMcf | [2],[3] | (13,100) | (11,200) | (9,100) |
Net proved reserves - end of period | MMcf | [2],[3] | 58,800 | 59,600 | 51,200 |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved developed reserves | MMcf | [3] | 41,800 | 40,900 | 29,300 | 15,800
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserves | MMcf | [3] | 17,000.0 | 18,700 | 21,900 | 0
Other International | Oil Equivalents (MBoe) |  |  |  |  |
Proved Developed Reserves (MBoe) [Roll Forward] |  |  |  |  |
Net proved reserves - beginning of period | MBoe | [1],[3] | 10,132 | 16,526 | 10,880 |
Revisions of previous estimates | MBoe | [1],[3] | 431 | 2,544 | 1,249 |
Purchases in place | MBoe | [1],[3] | 0 | 0 | 0 |
Extensions, discoveries and other additions | MBoe | [1],[3] | 1,661 | 778 | 6,104 |
Sales in place | MBoe | [1],[3] | 0 | (6,310) | 0 |
Production | MBoe | [1],[3] | (2,232) | (3,406) | (1,707) |
Net proved reserves - end of period | MBoe | [1],[3] | 9,992 | 10,132 | 16,526 |
Net Proved Undeveloped Reserves (MBOE) [Rollforward] |  |  |  |  |
Net proved undeveloped reserve (MBOE) | MBoe | [3] | 2,875 | 3,182 | 3,728 | 0
[1] | Thousand barrels or thousand 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.
[2] | Billion cubic feet.
[3] | Other International includes EOG's United Kingdom, China and Canada operations. The United Kingdom operations were sold in the fourth quarter of 2018.

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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References No definition available. + Details
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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 + Details
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