Business Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Schedule of Segment Reporting Information By Segment [Abstract]
Crude Oil and Condensate										$ 4,934,562		$ 9,742,480		$ 8,300,647
Natural Gas Liquids										407,658		934,051		773,970
Natural Gas										1,061,038		1,916,386		1,681,029
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts										61,924		834,273		(166,349)
Gathering, Processing and Marketing										2,253,135		4,046,316		3,643,749
Gains (Losses) on Asset Dispositions, Net										(8,798)		507,590		197,565
Other, Net										47,909		54,244		56,507
Net Operating Revenues		$ 1,796,761	$ 2,172,428	$ 2,469,701	$ 2,318,538	$ 4,645,497	$ 5,118,616	$ 4,187,556	$ 4,083,671	8,757,428	[1]	18,035,340	[2]	14,487,118	[3]
Depreciation, Depletion and Amortization										3,313,644		3,997,041		3,600,976
Operating Income (Loss)		(329,753)	(6,222,957)	39,626	(172,995)	1,226,652	1,786,162	1,144,730	1,084,279	(6,686,079)		5,241,823		3,675,211
Interest Income										3,469		2,239		5,585
Other Income (Expense)										(1,553)		(47,289)		(8,450)
Net Interest Expense										237,393		201,458		235,460
Income (Loss) Before Income Taxes		(398,826)	(6,274,921)	(11,478)	(236,331)	1,148,593	1,715,120	1,100,813	1,030,789	(6,921,556)		4,995,315		3,436,886
Income Tax Provision (Benefit)		(114,530)	$ (2,199,182)	$ (16,746)	$ (66,583)	704,005	$ 611,502	$ 394,460	$ 369,861	(2,397,041)		2,079,828		1,239,777
Additions to Oil and Gas Properties, Excluding Dry Hole Costs										4,710,404		7,471,177		6,622,436
Total Property, Plant and Equipment, Net		24,210,721				29,172,644				24,210,721		29,172,644		26,148,836
Total Assets		26,975,244				34,762,687				26,975,244		34,762,687		30,574,238
United States
Schedule of Segment Reporting Information By Segment [Abstract]
Crude Oil and Condensate										4,917,731		9,526,149		8,035,358
Natural Gas Liquids										407,570		924,454		761,535
Natural Gas										637,452		1,321,175		1,100,808
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts										61,924		834,273		(166,349)
Gathering, Processing and Marketing										2,254,477		4,040,024		3,636,209
Gains (Losses) on Asset Dispositions, Net										(12,176)		96,339		93,876
Other, Net										47,464		49,950		51,713
Net Operating Revenues										8,314,442	[1]	16,792,364	[2]	13,513,150	[3]
Depreciation, Depletion and Amortization										3,139,863		3,684,943		3,223,596
Operating Income (Loss)										(6,566,282)		5,074,911		3,543,841
Interest Income										1,913		849		2,803
Other Income (Expense)										6,461		(14,953)		(29,696)
Net Interest Expense										274,606		269,166		283,209
Income (Loss) Before Income Taxes										(6,832,514)		4,791,641		3,233,739
Income Tax Provision (Benefit)										(2,463,213)		1,837,185		1,161,328
Additions to Oil and Gas Properties, Excluding Dry Hole Costs										4,495,730		7,133,727		6,133,894
Total Property, Plant and Equipment, Net		23,593,995				28,391,741				23,593,995		28,391,741		24,456,383
Total Assets		25,351,908				32,871,398				25,351,908		32,871,398		27,668,713
Amount of sales with a single significant purchaser in the United States segment										1,700,000		4,000,000		3,900,000
Amount of sales with a second significant purchaser in the United States segment.										1,400,000		3,000,000		2,000,000
Trinidad
Schedule of Segment Reporting Information By Segment [Abstract]
Crude Oil and Condensate										13,122		29,604		40,379
Natural Gas Liquids										0		0		0
Natural Gas										368,639		483,071		477,103
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts										0		0		0
Gathering, Processing and Marketing										(1,342)		6,064		6,064
Gains (Losses) on Asset Dispositions, Net										393		0		1,119
Other, Net										(3)		37		24
Net Operating Revenues										380,809	[1]	518,776	[2]	524,689	[3]
Depreciation, Depletion and Amortization										154,853		188,592		181,990
Operating Income (Loss)										175,658		277,471		266,329
Interest Income										389		253		336
Other Income (Expense)										8,780		8,712		9,889
Net Interest Expense										1,400		0		0
Income (Loss) Before Income Taxes										183,427		286,436		276,554
Income Tax Provision (Benefit)										63,502		98,559		118,270
Additions to Oil and Gas Properties, Excluding Dry Hole Costs										102,358		76,138		132,984
Total Property, Plant and Equipment, Net		350,766				382,719				350,766		382,719		476,174
Total Assets		886,826				865,674				886,826		865,674		986,796
Other International
Schedule of Segment Reporting Information By Segment [Abstract]
Crude Oil and Condensate	[4]									3,709		186,727		224,910
Natural Gas Liquids	[4]									88		9,597		12,435
Natural Gas	[4]									54,947		112,140		103,118
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts	[4]									0		0		0
Gathering, Processing and Marketing	[4]									0		228		1,476
Gains (Losses) on Asset Dispositions, Net	[4]									2,985		411,251		102,570
Other, Net	[4]									448		4,257		4,770
Net Operating Revenues	[4]									62,177	[1]	724,200	[2]	449,279	[3]
Depreciation, Depletion and Amortization	[4]									18,928		123,506		195,390
Operating Income (Loss)	[4]									(295,455)		(110,559)		(134,959)
Interest Income	[4]									1,167		1,137		2,446
Other Income (Expense)	[4]									(16,794)		(41,048)		11,357
Net Interest Expense	[4]									(38,613)		(67,708)		(47,749)
Income (Loss) Before Income Taxes	[4]									(272,469)		(82,762)		(73,407)
Income Tax Provision (Benefit)	[4]									2,670		144,084		(39,821)
Additions to Oil and Gas Properties, Excluding Dry Hole Costs	[4]									112,316		261,312		355,558
Total Property, Plant and Equipment, Net	[4]	265,960				398,184				265,960		398,184		1,216,279
Total Assets	[4]	$ 736,510				$ 1,025,615				$ 736,510		$ 1,025,615		$ 1,918,729

[1] EOG had sales activity with two significant purchasers in 2015, one totaling $1.7 billion and the other totaling $1.4 billion of consolidated Net Operating Revenues in the United States segment.

[2] EOG had sales activity with two significant purchasers in 2014, one totaling $4.0 billion and the other totaling $3.0 billion of consolidated Net Operating Revenues in the United States segment.

[3] EOG had sales activity with two significant purchasers in 2013, one totaling $3.9 billion and the other totaling $2.0 billion of consolidated Net Operating Revenues in the United States segment.

[4] Other International primarily consists of EOG's United Kingdom, China, Canada and Argentina operations.