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Oil and Gas Exploration and Production Industries Disclosures, Discounted Future Net Cash Flows (Details) $ in Thousands | 12 Months Ended |  |  |
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Future cash inflows |  |  |  |  | $ 121,478,362 | [1] | $ 134,119,690 | [2] | $ 85,221,064 | [3]
Future production costs |  |  |  |  | (42,641,887) |  | (42,654,642) |  | (32,569,408) |
Future development costs |  |  |  |  | (20,586,449) |  | (16,667,893) |  | (13,538,795) |
Future income taxes |  |  |  |  | (11,565,498) |  | (14,962,141) |  | (6,160,541) |
Future net cash flows |  |  |  |  | 46,684,528 |  | 59,835,014 |  | 32,952,320 |
Discount to present value at 10% annual rate |  |  |  |  | (21,163,763) |  | (27,409,059) |  | (14,624,660) |
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves |  | $ 25,520,765 | $ 18,327,660 | $ 8,812,157 | 25,520,765 |  | 32,425,955 |  | 18,327,660 |
Annual Rate of Discount to Present Value |  | 10.00% | 10.00% | 10.00% |  |  |  |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ 32,425,955 | $ 18,327,660 | $ 8,812,157 |  |  |  |  |  |
Sales and transfers of oil and gas produced, net of production costs |  | (8,210,438) | (8,734,622) | (5,605,330) |  |  |  |  |  |
Net changes in prices and production costs |  | (10,880,447) | 12,856,429 | 7,121,545 |  |  |  |  |  |
Extensions, discoveries, additions and improved recovery, net of related costs |  | 5,709,558 | 8,430,953 | 3,958,248 |  |  |  |  |  |
Development costs incurred |  | 3,032,150 | 2,745,160 | 1,440,300 |  |  |  |  |  |
Revisions of estimated development cost |  | (738,024) | (410,525) | (124,877) |  |  |  |  |  |
Revisions of previous quantity estimates |  | (695,521) | (101,726) | 2,438,271 |  |  |  |  |  |
Accretion of discount |  | 3,949,758 | 2,042,622 | 886,707 |  |  |  |  |  |
Net change in income taxes |  | 1,548,707 | (4,973,058) | (2,043,663) |  |  |  |  |  |
Purchases of reserves in place |  | 98,539 | 116,887 | 30,362 |  |  |  |  |  |
Sales of reserves in place |  | (50,651) | (117,932) | (76,527) |  |  |  |  |  |
Changes in timing and other |  | (668,821) | 2,244,107 | 1,490,467 |  |  |  |  |  |
Balance at End of Period |  | 25,520,765 | 32,425,955 | 18,327,660 |  |  |  |  |  |
United States |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Future cash inflows |  |  |  |  | 120,359,769 | [1] | 133,066,375 | [2] | 83,652,363 | [3]
Future production costs |  |  |  |  | (42,387,801) |  | (42,351,174) |  | (32,018,812) |
Future development costs |  |  |  |  | (20,355,746) |  | (16,577,794) |  | (13,395,873) |
Future income taxes |  |  |  |  | (11,459,567) |  | (14,756,011) |  | (5,948,453) |
Future net cash flows |  |  |  |  | 46,156,655 |  | 59,381,396 |  | 32,289,225 |
Discount to present value at 10% annual rate |  |  |  |  | (21,042,593) |  | (27,348,744) |  | (14,532,290) |
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves |  | 32,032,652 | 17,756,935 | 8,493,727 | $ 25,114,062 |  | $ 32,032,652 |  | $ 17,756,935 |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | 32,032,652 | 17,756,935 | 8,493,727 |  |  |  |  |  |
Sales and transfers of oil and gas produced, net of production costs |  | (7,955,115) | (8,416,853) | (5,387,031) |  |  |  |  |  |
Net changes in prices and production costs |  | (10,973,981) | 12,750,466 | 6,606,908 |  |  |  |  |  |
Extensions, discoveries, additions and improved recovery, net of related costs |  | 5,608,038 | 8,418,666 | 3,644,041 |  |  |  |  |  |
Development costs incurred |  | 3,003,510 | 2,732,560 | 1,435,600 |  |  |  |  |  |
Revisions of estimated development cost |  | (597,869) | (410,741) | (114,464) |  |  |  |  |  |
Revisions of previous quantity estimates |  | (812,781) | (173,084) | 2,460,498 |  |  |  |  |  |
Accretion of discount |  | 3,891,701 | 1,967,592 | 849,373 |  |  |  |  |  |
Net change in income taxes |  | 1,454,050 | (4,965,373) | (1,918,989) |  |  |  |  |  |
Purchases of reserves in place |  | 98,539 | 116,887 | 30,362 |  |  |  |  |  |
Sales of reserves in place |  | (50,651) | (35,874) | (76,527) |  |  |  |  |  |
Changes in timing and other |  | (584,031) | 2,291,471 | 1,733,437 |  |  |  |  |  |
Balance at End of Period |  | 25,114,062 | 32,032,652 | 17,756,935 |  |  |  |  |  |
United States | Crude Oil [Member] |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Per unit price used to calculate future cash inflows |  |  |  |  | 57.51 |  | 68.54 |  | 49.21 |
United States | Natural Gas Liquids [Member] |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Per unit price used to calculate future cash inflows |  |  |  |  | 16.91 |  | 27.83 |  | 23.51 |
United States | Natural Gas [Member] |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Per unit price used to calculate future cash inflows |  |  |  |  | 2.07 |  | 2.50 |  | 1.96 |
Trinidad |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Future cash inflows |  |  |  |  | $ 813,102 | [1] | $ 749,695 | [2] | $ 904,141 | [3]
Future production costs |  |  |  |  | (166,705) |  | (204,444) |  | (239,213) |
Future development costs |  |  |  |  | (212,303) |  | (78,199) |  | (84,379) |
Future income taxes |  |  |  |  | (73,508) |  | (174,382) |  | (195,855) |
Future net cash flows |  |  |  |  | 360,586 |  | 292,670 |  | 384,694 |
Discount to present value at 10% annual rate |  |  |  |  | (86,009) |  | (26,832) |  | (52,267) |
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves |  | 265,838 | 265,838 | 332,427 | $ 274,577 |  | $ 265,838 |  | $ 332,427 |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | 265,838 | 332,427 | 185,750 |  |  |  |  |  |
Sales and transfers of oil and gas produced, net of production costs |  | (235,404) | (265,370) | (254,948) |  |  |  |  |  |
Net changes in prices and production costs |  | 65,962 | 84,353 | 436,969 |  |  |  |  |  |
Extensions, discoveries, additions and improved recovery, net of related costs |  | 85,233 | 0 | 270,255 |  |  |  |  |  |
Development costs incurred |  | 22,820 | 0 | 4,700 |  |  |  |  |  |
Revisions of estimated development cost |  | (129,047) | 4,030 | 9,683 |  |  |  |  |  |
Revisions of previous quantity estimates |  | 116,062 | 39,608 | (58,373) |  |  |  |  |  |
Accretion of discount |  | 43,148 | 50,191 | 24,066 |  |  |  |  |  |
Net change in income taxes |  | 93,975 | 3,844 | (114,575) |  |  |  |  |  |
Purchases of reserves in place |  | 0 | 0 | 0 |  |  |  |  |  |
Sales of reserves in place |  | 0 | 0 | 0 |  |  |  |  |  |
Changes in timing and other |  | (54,010) | 16,755 | (171,100) |  |  |  |  |  |
Balance at End of Period |  | 274,577 | 265,838 | 332,427 |  |  |  |  |  |
Trinidad | Crude Oil [Member] |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Per unit price used to calculate future cash inflows |  |  |  |  | 46.77 |  | 55.66 |  | 41.87 |
Trinidad | Natural Gas [Member] |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Per unit price used to calculate future cash inflows |  |  |  |  | 2.90 |  | 3.06 |  | 2.76 |
Other International (1) |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Future cash inflows | [4] |  |  |  | $ 305,491 | [1] | $ 303,620 | [2] | $ 664,560 | [3]
Future production costs | [4] |  |  |  | (87,381) |  | (99,024) |  | (311,383) |
Future development costs | [4] |  |  |  | (18,400) |  | (11,900) |  | (58,543) |
Future income taxes | [4] |  |  |  | (32,423) |  | (31,748) |  | (16,233) |
Future net cash flows | [4] |  |  |  | 167,287 |  | 160,948 |  | 278,401 |
Discount to present value at 10% annual rate | [4] |  |  |  | (35,161) |  | (33,483) |  | (40,103) |
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves | [4] | 127,465 | 238,298 | 238,298 | $ 132,126 |  | $ 127,465 |  | $ 238,298 |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period | [4] | 127,465 | 238,298 | 132,680 |  |  |  |  |  |
Sales and transfers of oil and gas produced, net of production costs | [4] | (19,919) | (52,399) | 36,649 |  |  |  |  |  |
Net changes in prices and production costs | [4] | 27,572 | 21,610 | 77,668 |  |  |  |  |  |
Extensions, discoveries, additions and improved recovery, net of related costs | [4] | 16,287 | 12,287 | 43,952 |  |  |  |  |  |
Development costs incurred | [4] | 5,820 | 12,600 | 0 |  |  |  |  |  |
Revisions of estimated development cost | [4] | (11,108) | (3,814) | (20,096) |  |  |  |  |  |
Revisions of previous quantity estimates | [4] | 1,198 | 31,750 | 36,146 |  |  |  |  |  |
Accretion of discount | [4] | 14,909 | 24,839 | 13,268 |  |  |  |  |  |
Net change in income taxes | [4] | 682 | (11,529) | (10,099) |  |  |  |  |  |
Purchases of reserves in place | [4] | 0 | 0 | 0 |  |  |  |  |  |
Sales of reserves in place | [4] | 0 | (82,058) | 0 |  |  |  |  |  |
Changes in timing and other | [4] | (30,780) | (64,119) | (71,870) |  |  |  |  |  |
Balance at End of Period | [4] | $ 132,126 | $ 127,465 | $ 238,298 |  |  |  |  |  |
Other International (1) | Crude Oil [Member] |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Per unit price used to calculate future cash inflows |  |  |  |  | 57.22 |  | 61.66 |  | 50.06 |
Other International (1) | Natural Gas [Member] |  |  |  |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Per unit price used to calculate future cash inflows |  |  |  |  | 5.01 |  | 4.88 |  | 5.16 |
[1] | 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.
[2] | Estimated crude oil prices used to calculate 2018 future cash inflows for the United States, Trinidad and Other International were $68.54, $55.66 and $61.66, respectively. Estimated NGL price used to calculate 2018 future cash inflows for the United States was $27.83. Estimated natural gas prices used to calculate 2018 future cash inflows for the United States, Trinidad and Other International were $2.50, $3.06 and $4.88, respectively.
[3] | Estimated crude oil prices used to calculate 2017 future cash inflows for the United States, Trinidad and Other International were $49.21, $41.87 and $50.06, respectively. Estimated NGL price used to calculate 2017 future cash inflows for the United States was $23.51. Estimated natural gas prices used to calculate 2017 future cash inflows for the United States, Trinidad and Other International were $1.96, $2.76 and $5.16, respectively.
[4] | 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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