Business Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		$ 2,965,498	$ 2,245,484	$ 1,103,374	$ 4,717,692	$ 4,320,246	$ 4,303,455	$ 4,697,630	$ 4,058,642	$ 11,032,048		$ 17,379,973		$ 17,275,399
Depreciation, Depletion and Amortization										3,400,353		3,749,704		3,435,408
Operating Income (Loss)		487,662	(2,714)	(1,086,549)	57,585	863,751	827,959	1,130,771	876,530	(544,016)		3,699,011		4,469,346
Interest Income										11,739		26,026		11,546
Other Income										(1,511)		5,359		5,158
Net Interest Expense										205,266		185,129		245,052
Income (Loss) Before Income Taxes										(739,054)		3,545,267		4,240,998
Income Tax Provision (Benefit)		90,294	$ (10,088)	$ (235,878)	$ 21,190	194,687	$ 182,335	$ 241,525	$ 191,810	(134,482)		810,357		821,958
Additions to Oil and Gas Properties, Excluding Dry Hole Costs										3,441,858		6,273,952		6,195,330
Total Property, Plant and Equipment, Net		28,598,627				30,364,595				28,598,627		30,364,595		28,075,519
Total Assets		35,804,601				37,124,608				35,804,601		37,124,608		33,934,474
Pretax Impairment Charges For Other Assets		228,000								228,000
Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										5,785,609		9,612,532		9,517,440
Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										667,514		784,818		1,127,510
Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										837,133		1,184,095		1,301,537
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										1,144,737		180,275		(165,640)
Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										2,582,984		5,360,282		5,230,355
Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										(46,883)		123,613		174,562
Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										60,954		134,358		89,635
United States
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other										10,795,299	[1]	17,052,363	[2]	16,794,591	[3]
Depreciation, Depletion and Amortization										3,323,800		3,652,294		3,296,499
Operating Income (Loss)										(545,566)		3,618,907		4,334,364
Interest Income										10,783		22,122		9,326
Other Income										153		3,235
Other Expense														9,580
Net Interest Expense										205,266		192,587		253,352
Income (Loss) Before Income Taxes										(739,896)		3,451,677		4,099,918
Income Tax Provision (Benefit)										(156,834)		760,881		765,986
Additions to Oil and Gas Properties, Excluding Dry Hole Costs										3,316,724		6,208,394		6,155,874
Total Property, Plant and Equipment, Net		28,283,027				30,101,857				28,283,027		30,101,857		27,786,086
Total Assets		35,047,485				36,274,942				35,047,485		36,274,942		33,178,733
Amount of sales with a single significant purchaser in the United States segment										1,100,000		2,400,000		2,600,000
Amount of sales with a second significant purchaser in the United States segment.												2,200,000		2,300,000
Pretax Impairment Charges For Proved Oil And Gas Properties And Other Property Plant And Equipment										1,570,000
Pretax Impairment Charges For Other Assets		228,000								228,000
United States | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										5,773,582		9,599,125		9,390,244
United States | Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										667,514		784,818		1,127,510
United States | Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										614,002		866,911		970,866
United States | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										1,144,737		180,275		(165,640)
United States | Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										2,581,493		5,355,463		5,227,051
United States | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										(47,018)		131,446		154,852
United States | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										60,989		134,325		89,708
Trinidad
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other										181,102		271,106		309,860
Depreciation, Depletion and Amortization										60,629		79,389		91,971
Operating Income (Loss)										74,801		112,790		147,240
Interest Income										922		3,686		1,612
Other Income										(2,129)		727		2,436
Net Interest Expense										0		0		0
Income (Loss) Before Income Taxes										73,594		117,203		151,288
Income Tax Provision (Benefit)										14,568		40,901		54,272
Additions to Oil and Gas Properties, Excluding Dry Hole Costs										83,173		53,325		1,618
Total Property, Plant and Equipment, Net		210,278				184,606				210,278		184,606		210,183
Total Assets		546,120				705,747				546,120		705,747		629,633
Trinidad | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										10,723		11,138		17,059
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										168,967		258,819		285,053
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										1,491		4,819		3,304
Trinidad | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										(44)		(3,688)		4,493
Trinidad | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues										(35)		18		(49)
Other International
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other	[4]									55,647		56,504		170,948
Depreciation, Depletion and Amortization	[4]									15,924		18,021		46,938
Operating Income (Loss)	[4]									(73,251)		(32,686)		(12,258)
Interest Income	[4]									34		218		608
Other Income										465				(6,858)	[4]
Other Expense	[4]											1,397
Net Interest Expense	[4]									0		(7,458)		(8,300)
Income (Loss) Before Income Taxes	[4]									(72,752)		(23,613)		(10,208)
Income Tax Provision (Benefit)	[4]									7,784		8,575		1,700
Additions to Oil and Gas Properties, Excluding Dry Hole Costs	[4]									41,961		12,233		37,838
Total Property, Plant and Equipment, Net	[4]	105,322				78,132				105,322		78,132		79,250
Total Assets	[4]	$ 210,996				$ 143,919				210,996		143,919		126,108
Other International | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									1,304		2,269		110,137
Other International | Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									0		0		0
Other International | Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									54,164		58,365		45,618
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]									179		(4,145)		15,217
Other International | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[4]									$ 0		$ 15		$ (24)

[1] EOG had sales activity with three significant purchasers in 2020, each totaling $1.1 billion of consolidated Operating Revenues and Other in the United States segment.(3)EOG recorded pretax impairment charges of $1,570 million in 2020 for proved oil and gas properties, leasehold costs and other assets due to the decline in commodity prices and revisions of asset retirement obligations for certain properties in the United States segment. In addition, EOG recorded pretax impairment charges of $228 million in 2020 for owned and leased sand and crude-by-rail assets, also in the United States segment. EOG recorded pretax impairment charges of $81 million in 2020 for proved oil and gas properties and firm commitment contracts related to its decision to exit the Horn River Basin in British Columbia, Canada, in the Other International segment. See Notes 13 and 14.

[2] 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.

[3] 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.

[4] Other International primarily consists of EOG's United Kingdom, China and Canada operations. EOG began an exploration program in Oman in the third quarter of 2020. The United Kingdom operations were sold in the fourth quarter of 2018.