Business Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		$ 4,320,246	$ 4,303,455	$ 4,697,630	$ 4,058,642	$ 4,574,536	$ 4,781,624	$ 4,238,077	$ 3,681,162	$ 17,379,973		$ 17,275,399		$ 11,208,320
Depreciation, Depletion and Amortization										3,749,704		3,435,408		3,409,387
Operating Income (Loss)		863,751	827,959	1,130,771	876,530	1,123,140	1,506,687	964,931	874,588	3,699,011		4,469,346		926,402
Interest Income										26,026		11,546		7,713
Other Income										5,359		5,158		1,439
Net Interest Expense										185,129		245,052		274,372
Income (Loss) Before Income Taxes										3,545,267		4,240,998		661,182
Income Tax Provision (Benefit)		194,687	$ 182,335	$ 241,525	$ 191,810	195,572	$ 255,411	$ 196,205	$ 174,770	810,357		821,958		(1,921,397)
Additions to Oil and Gas Properties, Excluding Dry Hole Costs										6,273,952		6,195,330		4,228,228
Total Property, Plant and Equipment, Net		30,364,595				28,075,519				30,364,595		28,075,519		25,665,037
Total Assets		37,124,608				33,934,474				37,124,608		33,934,474		29,833,078
Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										9,612,532		9,517,440		6,256,396
Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										784,818		1,127,510		729,561
Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										1,184,095		1,301,537		921,934
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										180,275		(165,640)		19,828
Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										5,360,282		5,230,355		3,298,087
Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										123,613		174,562		(99,096)
Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										134,358		89,635		81,610
United States
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other										17,052,363	[1]	16,794,591	[2]	10,872,071	[3]
Depreciation, Depletion and Amortization										3,652,294		3,296,499		3,269,196
Operating Income (Loss)										3,618,907		4,334,364		933,571
Interest Income										22,122		9,326		3,223
Other Income										3,235		9,580
Other Expense														(9,659)
Net Interest Expense										192,587		253,352		303,941
Income (Loss) Before Income Taxes										3,451,677		4,099,918		623,194
Income Tax Provision (Benefit)										760,881		765,986		(1,964,343)
Additions to Oil and Gas Properties, Excluding Dry Hole Costs										6,208,394		6,155,874		4,067,359
Total Property, Plant and Equipment, Net		30,101,857				27,786,086				30,101,857		27,786,086		25,125,427
Total Assets		36,274,942				33,178,733				36,274,942		33,178,733		28,312,599
Amount of sales with a single significant purchaser in the United States segment										2,400,000		2,600,000		1,500,000
Amount of sales with a second significant purchaser in the United States segment.										2,200,000		2,300,000		1,300,000
United States | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										9,599,125		9,390,244		6,225,711
United States | Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										784,818		1,127,510		729,545
United States | Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										866,911		970,866		615,512
United States | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										180,275		(165,640)		19,828
United States | Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										5,355,463		5,227,051		3,298,098
United States | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										131,446		154,852		(98,233)
United States | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										134,325		89,708		81,610
Trinidad
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other										271,106		309,860		284,713
Depreciation, Depletion and Amortization										79,389		91,971		115,321
Operating Income (Loss)										112,790		147,240		101,010
Interest Income										3,686		1,612		2,201
Other Income										727		2,436		3,337
Net Interest Expense										0		0		0
Income (Loss) Before Income Taxes										117,203		151,288		106,548
Income Tax Provision (Benefit)										40,901		54,272		38,798
Additions to Oil and Gas Properties, Excluding Dry Hole Costs										53,325		1,618		145,937
Total Property, Plant and Equipment, Net		184,606				210,183				184,606		210,183		313,357
Total Assets		705,747				629,633				705,747		629,633		974,477
Trinidad | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										11,138		17,059		13,572
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										258,819		285,053		271,101
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										4,819		3,304		(11)
Trinidad | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										(3,688)		4,493		(8)
Trinidad | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										18		(49)		59
Other International
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other	[4]									56,504		170,948		51,536
Depreciation, Depletion and Amortization	[4]									18,021		46,938		24,870
Operating Income (Loss)	[4]									(32,686)		(12,258)		(108,179)
Interest Income	[4]									218		608		2,289
Other Income										1,397				7,761	[4]
Other Expense	[4]											(6,858)
Net Interest Expense	[4]									(7,458)		(8,300)		(29,569)
Income (Loss) Before Income Taxes	[4]									(23,613)		(10,208)		(68,560)
Income Tax Provision (Benefit)	[4]									8,575		1,700		4,148
Additions to Oil and Gas Properties, Excluding Dry Hole Costs	[4]									12,233		37,838		14,932
Total Property, Plant and Equipment, Net	[4]	78,132				79,250				78,132		79,250		226,253
Total Assets	[4]	$ 143,919				$ 126,108				143,919		126,108		546,002
Other International | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									2,269		110,137		17,113
Other International | Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									0		0		16
Other International | Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									58,365		45,618		35,321
Other International | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									0		0		0
Other International | Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									0		0		0
Other International | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									(4,145)		15,217		(855)
Other International | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									$ 15		$ (24)		$ (59)

[1] EOG had sales activity with two significant purchasers in 2019, one totaling $2.4 billion, and the other totaling $2.2 billion of consolidated Operating Revenues and Other in the United States segment.

[2] 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.

[3] 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.

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