Oil and Gas Exploration and Production Industries Disclosures, Discounted Future Net Cash Flows (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)		Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows					$ 134,119,690	[1]	$ 85,221,064	[2]	$ 58,840,424	[3]
Future production costs					(42,654,642)		(32,569,408)		(28,018,883)
Future development costs					(16,667,893)		(13,538,795)		(12,741,932)
Future income taxes					(14,962,141)		(6,160,541)		(3,211,320)
Future net cash flows					59,835,014		32,952,320		14,868,289
Discount to present value at 10% annual rate					(27,409,059)		(14,624,660)		(6,056,132)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves		$ 18,327,660	$ 8,812,157	$ 9,621,396	32,425,955		18,327,660		8,812,157
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		$ 18,327,660	$ 8,812,157	$ 9,621,396
Sales and transfers of oil and gas produced, net of production costs		(8,734,622)	(5,605,330)	(3,478,625)
Net changes in prices and production costs		12,856,429	7,121,545	(3,679,602)
Extensions, discoveries, additions and improved recovery, net of related costs		8,430,953	3,958,248	907,267
Development costs incurred		2,745,160	1,440,300	1,230,000
Revisions of estimated development cost		(410,525)	(124,877)	2,121,708
Revisions of previous quantity estimates		(101,726)	2,438,271	1,053,020
Accretion of discount		2,042,622	886,707	1,054,435
Net change in income taxes		(4,973,058)	(2,043,663)	868,038
Purchases of reserves in place		116,887	30,362	377,872
Sales of reserves in place		(117,932)	(76,527)	(375,793)
Changes in timing and other		2,244,107	1,490,467	(887,559)
Balance at End of Period		32,425,955	18,327,660	8,812,157
United States
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows					133,066,375	[1]	83,652,363	[2]	57,913,314	[3]
Future production costs					(42,351,174)		(32,018,812)		(27,625,833)
Future development costs					(16,577,794)		(13,395,873)		(12,602,699)
Future income taxes					(14,756,011)		(5,948,453)		(3,151,319)
Future net cash flows					59,381,396		32,289,225		14,533,463
Discount to present value at 10% annual rate					(27,348,744)		(14,532,290)		(6,039,736)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves		17,756,935	8,493,727	8,965,467	$ 32,032,652		$ 17,756,935		$ 8,493,727
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		17,756,935	8,493,727	8,965,467
Sales and transfers of oil and gas produced, net of production costs		(8,416,853)	(5,387,031)	(3,260,372)
Net changes in prices and production costs		12,750,466	6,606,908	(3,352,802)
Extensions, discoveries, additions and improved recovery, net of related costs		8,418,666	3,644,041	865,066
Development costs incurred		2,732,560	1,435,600	1,207,000
Revisions of estimated development cost		(410,741)	(114,464)	2,092,769
Revisions of previous quantity estimates		(173,084)	2,460,498	1,013,753
Accretion of discount		1,967,592	849,373	970,388
Net change in income taxes		(4,965,373)	(1,918,989)	738,416
Purchases of reserves in place		116,887	30,362	377,872
Sales of reserves in place		(35,874)	(76,527)	(375,793)
Changes in timing and other		2,291,471	1,733,437	(748,037)
Balance at End of Period		32,032,652	17,756,935	8,493,727
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					68.54		49.21		40.70
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					27.83		23.51		14.69
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					2.50		1.96		1.40
Trinidad
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows					$ 749,695	[1]	$ 904,141	[2]	$ 524,523	[3]
Future production costs					(204,444)		(239,213)		(165,757)
Future development costs					(78,199)		(84,379)		(103,631)
Future income taxes					(174,382)		(195,855)		(60,001)
Future net cash flows					292,670		384,694		195,134
Discount to present value at 10% annual rate					(26,832)		(52,267)		(9,384)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves		332,427	185,750	381,124	$ 265,838		$ 332,427		$ 185,750
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		332,427	185,750	381,124
Sales and transfers of oil and gas produced, net of production costs		(265,370)	(254,948)	(215,414)
Net changes in prices and production costs		84,353	436,969	(182,876)
Extensions, discoveries, additions and improved recovery, net of related costs		0	270,255	42,201
Development costs incurred		0	4,700	3,900
Revisions of estimated development cost		4,030	9,683	22,596
Revisions of previous quantity estimates		39,608	(58,373)	36,648
Accretion of discount		50,191	24,066	56,566
Net change in income taxes		3,844	(114,575)	129,622
Purchases of reserves in place		0	0	0
Sales of reserves in place		0	0	0
Changes in timing and other		16,755	(171,100)	(88,617)
Balance at End of Period		265,838	332,427	185,750
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					55.66		41.87		34.79
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					3.06		2.76		1.76
Other International (1)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows	[4]				$ 303,620	[1]	$ 664,560	[2]	$ 402,587	[3]
Future production costs	[4]				(99,024)		(311,383)		(227,293)
Future development costs	[4]				(11,900)		(58,543)		(35,602)
Future income taxes	[4]				(31,748)		(16,233)		0
Future net cash flows	[4]				160,948		278,401		139,692
Discount to present value at 10% annual rate	[4]				(33,483)		(40,103)		(7,012)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves	[4]	238,298	132,680	274,805	$ 127,465		$ 238,298		$ 132,680
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]	238,298	132,680	274,805
Sales and transfers of oil and gas produced, net of production costs	[4]	(52,399)	36,649	(2,839)
Net changes in prices and production costs	[4]	21,610	77,668	(143,924)
Extensions, discoveries, additions and improved recovery, net of related costs	[4]	12,287	43,952	0
Development costs incurred	[4]	12,600	0	19,100
Revisions of estimated development cost	[4]	(3,814)	(20,096)	6,343
Revisions of previous quantity estimates	[4]	31,750	36,146	2,619
Accretion of discount	[4]	24,839	13,268	27,481
Net change in income taxes	[4]	(11,529)	(10,099)	0
Purchases of reserves in place	[4]	0	0	0
Sales of reserves in place	[4]	82,058	0	0
Changes in timing and other	[4]	(64,119)	(71,870)	(50,905)
Balance at End of Period	[4]	$ 127,465	$ 238,298	$ 132,680
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					61.66		50.06		39.55
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					4.88		5.16		4.84

[1] 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.

[2] 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.

[3] Estimated crude oil prices used to calculate 2016 future cash inflows for the United States, Trinidad and Other International were $40.70, $34.79 and $39.55, respectively. Estimated NGL price used to calculate 2016 future cash inflows for the United States was $14.69. Estimated natural gas prices used to calculate 2016 future cash inflows for the United States, Trinidad and Other International were $1.40, $1.76 and $4.84, respectively

[4] Other International includes EOG's United Kingdom, China, Canada and Argentina operations. The United Kingdom operations were sold in the fourth quarter of 2018. The Argentina operations were sold in the third quarter of 2016.