Oil and Gas Exploration and Production Industries Disclosures, Discounted Future Net Cash Flows (Details) $ in Thousands		12 Months Ended
		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.