Business Segment Information (Details) (USD $)	3 Months Ended										12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Schedule of Segment Reporting Information By Segment [Abstract]
Crude Oil and Condensate											$ 9,742,480,000		$ 8,300,647,000		$ 5,659,437,000
Natural Gas Liquids											934,051,000		773,970,000		727,177,000
Natural Gas											1,916,386,000		1,681,029,000		1,571,762,000
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts											834,273,000		(166,349,000)		393,744,000
Gathering, Processing and Marketing											4,046,316,000		3,643,749,000		3,096,694,000
Gains on Asset Dispositions, Net											507,590,000		197,565,000		192,660,000
Other, Net											54,244,000		56,507,000		41,162,000
Net Operating Revenues	4,645,497,000		5,118,616,000	4,187,556,000	4,083,671,000	3,749,023,000		3,541,396,000	3,840,185,000	3,356,514,000	18,035,340,000		14,487,118,000		11,682,636,000
Depreciation, Depletion and Amortization											3,997,041,000		3,600,976,000		3,169,703,000
Operating Income (Loss)	1,226,652,000		1,786,162,000	1,144,730,000	1,084,279,000	980,324,000		769,769,000	1,092,044,000	833,074,000	5,241,823,000		3,675,211,000		1,479,797,000
Interest Income											2,239,000		5,585,000		8,771,000
Other Income (Expense)											(47,289,000)		(8,450,000)		5,724,000
Net Interest Expense											201,458,000		235,460,000		213,552,000
Income (Loss) Before Income Taxes	1,148,593,000		1,715,120,000	1,100,813,000	1,030,789,000	919,082,000		721,555,000	1,035,230,000	761,019,000	4,995,315,000		3,436,886,000		1,280,740,000
Income Tax Provision (Benefit)	704,005,000		611,502,000	394,460,000	369,861,000	338,888,000		259,057,000	375,538,000	266,294,000	2,079,828,000		1,239,777,000		710,461,000
Additions to Oil and Gas Properties, Excluding Dry Hole Costs											7,471,177,000		6,622,436,000		6,720,346,000
Total Property, Plant and Equipment, Net	29,172,644,000					26,148,836,000					29,172,644,000		26,148,836,000		23,337,681,000
Total Assets	34,762,687,000					30,574,238,000					34,762,687,000		30,574,238,000		27,336,578,000
United States [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Crude Oil and Condensate											9,526,149,000		8,035,358,000		5,383,612,000
Natural Gas Liquids											924,454,000		761,535,000		713,497,000
Natural Gas											1,321,175,000		1,100,808,000		951,463,000
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts											834,273,000		(166,349,000)		393,744,000
Gathering, Processing and Marketing											4,040,024,000		3,636,209,000		3,091,281,000
Gains on Asset Dispositions, Net											96,339,000		93,876,000		166,201,000
Other, Net											49,950,000		51,713,000		40,780,000
Net Operating Revenues											16,792,364,000	[1]	13,513,150,000	[2]	10,740,578,000	[3]
Depreciation, Depletion and Amortization											3,684,943,000		3,223,596,000		2,780,563,000
Operating Income (Loss)											5,074,911,000		3,543,841,000		2,233,911,000
Interest Income											849,000		2,803,000		8,343,000
Other Income (Expense)											(14,953,000)		(29,696,000)		(12,455,000)
Net Interest Expense											269,166,000		283,209,000		242,138,000
Income (Loss) Before Income Taxes											4,791,641,000		3,233,739,000		1,987,661,000
Income Tax Provision (Benefit)											1,837,185,000		1,161,328,000		707,401,000
Additions to Oil and Gas Properties, Excluding Dry Hole Costs											7,133,727,000		6,133,894,000		6,198,267,000
Total Property, Plant and Equipment, Net	28,391,741,000					24,456,383,000					28,391,741,000		24,456,383,000		21,560,998,000
Total Assets	32,871,398,000					27,668,713,000					32,871,398,000		27,668,713,000		24,523,072,000
Amount of sales with a single significant purchaser in the United States segment											4,000,000,000		3,900,000,000		2,200,000,000
Amount of sales with a second significant purchaser in the United States segment.											3,000,000,000		2,000,000,000
Canada [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Crude Oil and Condensate											184,420,000		221,999,000		221,556,000
Natural Gas Liquids											9,597,000		12,435,000		13,680,000
Natural Gas											96,274,000		85,446,000		86,361,000
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts											0		0		0
Gathering, Processing and Marketing											228,000		1,476,000		0
Gains on Asset Dispositions, Net											411,251,000		102,570,000		26,459,000
Other, Net											4,257,000		4,770,000		367,000
Net Operating Revenues											706,027,000	[1]	428,696,000	[2]	348,423,000	[3]
Depreciation, Depletion and Amortization											105,274,000		180,836,000		223,689,000
Operating Income (Loss)											360,114,000		(45,214,000)		(1,065,434,000)
Interest Income											847,000		2,076,000		123,000
Other Income (Expense)											(19,719,000)		7,707,000		(8,689,000)
Net Interest Expense											(20,681,000)		(4,204,000)		6,589,000
Income (Loss) Before Income Taxes											361,923,000		(31,227,000)		(1,080,589,000)
Income Tax Provision (Benefit)											80,807,000		598,000		(134,745,000)
Additions to Oil and Gas Properties, Excluding Dry Hole Costs											76,642,000		137,920,000		302,851,000
Total Property, Plant and Equipment, Net	33,635,000					602,333,000					33,635,000		602,333,000		877,996,000
Total Assets	182,250,000					880,765,000					182,250,000		880,765,000		1,202,031,000
Trinidad [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Crude Oil and Condensate											29,604,000		40,379,000		50,708,000
Natural Gas Liquids											0		0		0
Natural Gas											483,071,000		477,103,000		514,322,000
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts											0		0		0
Gathering, Processing and Marketing											6,064,000		6,064,000		5,413,000
Gains on Asset Dispositions, Net											0		1,119,000		0
Other, Net											37,000		24,000		15,000
Net Operating Revenues											518,776,000	[1]	524,689,000	[2]	570,458,000	[3]
Depreciation, Depletion and Amortization											188,592,000		181,990,000		147,062,000
Operating Income (Loss)											277,471,000		266,329,000		371,876,000
Interest Income											253,000		336,000		125,000
Other Income (Expense)											8,712,000		9,889,000		20,482,000
Net Interest Expense											0		0		238,000
Income (Loss) Before Income Taxes											286,436,000		276,554,000		392,245,000
Income Tax Provision (Benefit)											98,559,000		118,270,000		140,468,000
Additions to Oil and Gas Properties, Excluding Dry Hole Costs											76,138,000		132,984,000		49,376,000
Total Property, Plant and Equipment, Net	382,719,000					476,174,000					382,719,000		476,174,000		535,405,000
Total Assets	865,674,000					986,796,000					865,674,000		986,796,000		1,012,727,000
Other International [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Crude Oil and Condensate											2,307,000	[4]	2,911,000	[4]	3,561,000	[4]
Natural Gas Liquids											0	[4]	0	[4]	0	[4]
Natural Gas											15,866,000	[4]	17,672,000	[4]	19,616,000	[4]
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts											0	[4]	0	[4]	0	[4]
Gathering, Processing and Marketing											0	[4]	0	[4]	0	[4]
Gains on Asset Dispositions, Net											0	[4]	0	[4]	0	[4]
Other, Net											0	[4]	0	[4]	0	[4]
Net Operating Revenues											18,173,000	[1],[4]	20,583,000	[2],[4]	23,177,000	[3],[4]
Depreciation, Depletion and Amortization											18,232,000	[4]	14,554,000	[4]	18,389,000	[4]
Operating Income (Loss)											(470,673,000)	[4]	(89,745,000)	[4]	(60,556,000)	[4]
Interest Income											290,000	[4]	370,000	[4]	180,000	[4]
Other Income (Expense)											(21,329,000)	[4]	3,650,000	[4]	6,386,000	[4]
Net Interest Expense											(47,027,000)	[4]	(43,545,000)	[4]	(35,413,000)	[4]
Income (Loss) Before Income Taxes											(444,685,000)	[4]	(42,180,000)	[4]	(18,577,000)	[4]
Income Tax Provision (Benefit)											63,277,000	[4]	(40,419,000)	[4]	(2,663,000)	[4]
Additions to Oil and Gas Properties, Excluding Dry Hole Costs											184,670,000	[4]	217,638,000	[4]	169,852,000	[4]
Total Property, Plant and Equipment, Net	364,549,000	[4]				613,946,000	[4]				364,549,000	[4]	613,946,000	[4]	363,282,000	[4]
Total Assets	$ 843,365,000	[4]				$ 1,037,964,000	[4]				$ 843,365,000	[4]	$ 1,037,964,000	[4]	$ 598,748,000	[4]

[1] 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.

[2] 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.

[3] EOG had sales activity with a single significant purchaser in 2012 that totaled $2.2 billion of consolidated Net Operating Revenues in the United States segment.

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