Business Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		$ 4,574,536	$ 4,781,624	$ 4,238,077	$ 3,681,162	$ 3,340,439		$ 2,644,844		$ 2,612,472		$ 2,610,565		$ 17,275,399		$ 11,208,320		$ 7,650,632	[1]
Depreciation, Depletion and Amortization														3,435,408		3,409,387		3,553,417
Operating Income (Loss)		1,123,140	1,506,687	964,931	874,588	475,912		214,836		127,908		107,746		4,469,346		926,402		(1,225,281)
Interest Income														11,546		7,713		2,619
Other Income														5,158		1,439
Other Expense																		(53,162)
Net Interest Expense														245,052		274,372		281,681
Income (Loss) Before Income Taxes														4,240,998		661,182		(1,557,505)
Income Tax Provision (Benefit)		195,572	$ 255,411	$ 196,205	$ 174,770	(2,017,115)	[2]	$ 45,439	[2]	$ 39,414	[2]	$ 10,865	[2]	821,958		(1,921,397)		(460,819)
Additions to Oil and Gas Properties, Excluding Dry Hole Costs														6,195,330		4,228,228		6,329,369
Total Property, Plant and Equipment, Net		28,075,519				25,665,037								28,075,519		25,665,037		25,707,078
Total Assets		33,934,474				29,833,078								33,934,474		29,833,078		29,299,201	[3]
Amount of sales with a single significant purchaser in the United States segment														2,600,000		1,500,000		1,200,000
Amount of sales with a second significant purchaser in the United States segment.														2,300,000		1,300,000		1,100,000
Amount of sales with a third significant purchaser in the United States segment																		1,000,000
Reclassification to Deferred Tax Assets		777				17,506								777		17,506		160,000
Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														9,517,440		6,256,396		4,317,341
Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														1,127,510		729,561		437,250
Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														1,301,537		921,934		742,152
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														(165,640)		19,828		(99,608)
Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														5,230,355		3,298,087		1,966,259
Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														174,562		(99,096)		205,835
Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														89,635		81,610		81,403
United States
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other														16,794,591	[4]	10,872,071	[5]	7,323,200	[1]
Depreciation, Depletion and Amortization														3,296,499		3,269,196		3,365,390
Operating Income (Loss)														4,334,364		933,571		(1,192,338)
Interest Income														9,326		3,223		358
Other Income														9,580				(15,703)
Other Expense																(9,659)
Net Interest Expense														253,352		303,941		298,125
Income (Loss) Before Income Taxes														4,099,918		623,194		(1,505,808)
Income Tax Provision (Benefit)														765,986		(1,964,343)		(516,180)
Additions to Oil and Gas Properties, Excluding Dry Hole Costs														6,155,874		4,067,359		6,223,228
Total Property, Plant and Equipment, Net		27,786,086				25,125,427								27,786,086		25,125,427		25,221,517
Total Assets		33,178,733				28,312,599								33,178,733		28,312,599		27,746,851	[3]
United States | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														9,390,244		6,225,711		4,265,036
United States | Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														1,127,510		729,545		437,238
United States | Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														970,866		615,512		475,715
United States | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														(165,640)		19,828		(99,608)
United States | Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														5,227,051		3,298,098		1,967,390
United States | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														154,852		(98,233)		196,043
United States | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														89,708		81,610		81,386
Trinidad
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other														309,860		284,713		242,424	[1]
Depreciation, Depletion and Amortization														91,971		115,321		145,591
Operating Income (Loss)														147,240		101,010		46,473
Interest Income														1,612		2,201		932
Other Income														2,436		3,337		2,667
Net Interest Expense														0		0		0
Income (Loss) Before Income Taxes														151,288		106,548		50,072
Income Tax Provision (Benefit)														54,272		38,798		64,281
Additions to Oil and Gas Properties, Excluding Dry Hole Costs														1,618		145,937		75,407
Total Property, Plant and Equipment, Net		210,183				313,357								210,183		313,357		274,850
Total Assets		629,633				974,477								629,633		974,477		889,253	[3]
Trinidad | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														17,059		13,572		9,600
Trinidad | Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														0		0		0
Trinidad | Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														285,053		271,101		234,108
Trinidad | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														0		0		0
Trinidad | Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														3,304		(11)		(1,131)
Trinidad | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														4,493		(8)		(145)
Trinidad | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues														(49)		59		(8)
Other International
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other	[6]													170,948		51,536		85,008	[1]
Depreciation, Depletion and Amortization	[6]													46,938		24,870		42,436
Operating Income (Loss)	[6]													(12,258)		(108,179)		(79,416)
Interest Income	[6]													608		2,289		1,329
Other Income	[6]															7,761
Other Expense	[6]													(6,858)				(40,126)
Net Interest Expense	[6]													(8,300)		(29,569)		(16,444)
Income (Loss) Before Income Taxes	[6]													(10,208)		(68,560)		(101,769)
Income Tax Provision (Benefit)	[6]													1,700		4,148		(8,920)
Additions to Oil and Gas Properties, Excluding Dry Hole Costs	[6]													37,838		14,932		30,734
Total Property, Plant and Equipment, Net	[6]	79,250				226,253								79,250		226,253		210,711
Total Assets	[6]	$ 126,108				$ 546,002								126,108		546,002		663,097	[3]
Other International | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]													110,137		17,113		42,705
Other International | Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]													0		16		12
Other International | Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]													45,618		35,321		32,329
Other International | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]													0		0		0
Other International | Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]													0		0		0
Other International | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]													15,217		(855)		9,937
Other International | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]													$ (24)		$ (59)		$ 25

[1] EOG had sales activity with three significant purchasers in 2016, one totaling $1.2 billion, one totaling $1.1 billion and one totaling $1.0 billion of consolidated Operating Revenues and Other in the United States segment.

[2] Includes an income tax benefit of approximately $2.2 billion for the quarter ended December 31, 2017, primarily due to the enactment of the Tax Cuts and Jobs Act in December 2017. See Note 6 to the Consolidated Financial Statements.

[3] EOG made a reclassification of $160 million from deferred tax liabilities to deferred tax assets for the year ended December 31, 2016, for the United States segment and in total.

[4] EOG had sales activity with two significant purchasers in 2018, one totaling $2.6 billion and the other totaling $2.3 billion of consolidated Operating Revenues and Other in the United States segment.

[5] EOG had sales activity with two significant purchasers in 2017, one totaling $1.5 billion and the other totaling $1.3 billion of consolidated Operating Revenues and Other in the United States segment.

[6] Other International primarily consists of 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.