Business Segment Information (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Jun. 30, 2021	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other			$ 18,642		$ 11,032		$ 17,380
Depreciation, Depletion and Amortization			3,651		3,400		3,750
Operating Income (Loss)			6,102		(544)		3,699
Interest Income			3		12		26
Other Income (Expense)			6		(2)		5
Net Interest Expense (Income)			178		205		185
Income (Loss) Before Income Taxes			5,933		(739)		3,545
Income Tax Provision (Benefit)			1,269		(134)		810
Additions to Oil and Gas Properties, Excluding Dry Hole Costs			3,617		3,443		6,274
Total Property, Plant and Equipment, Net			28,426		28,599		30,364
Total Assets			38,236		35,805		37,125
Dry Hole Costs	[1]		71		13		28
Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			11,125		5,786		9,613
Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			1,812		668		785
Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			2,444		837		1,184
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			(1,152)		1,145		180
Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			4,288		2,583		5,360
Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			17		(47)		124
Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			108		60		134
United States
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other			18,265	[2]	10,795	[3]	17,052	[4]
Depreciation, Depletion and Amortization			3,558		3,324		3,652
Operating Income (Loss)			6,013		(546)	[5]	3,619
Interest Income			3		11		22
Other Income (Expense)			(14)		0		3
Net Interest Expense (Income)			178		205		192
Income (Loss) Before Income Taxes			5,824		(740)		3,452
Income Tax Provision (Benefit)			1,247		(157)		761
Additions to Oil and Gas Properties, Excluding Dry Hole Costs			3,557		3,318		6,209
Total Property, Plant and Equipment, Net			28,213		28,284		30,102
Total Assets			37,436		35,048		36,275
Amount of sales with a single significant purchaser in the United States segment			2,700		1,100		2,400
Amount of sales with a second significant purchaser in the United States segment.			2,600				2,200
Pretax Impairment Charges For Proved Oil And Gas Properties And Other Property Plant And Equipment					1,570
Pretax Impairment Charges For Other Assets					228
United States | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			11,094		5,774		9,599
United States | Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			1,812		668		785
United States | Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			2,156		614		867
United States | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			(1,152)		1,145		180
United States | Gathering, Processing and Marketing
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			4,287		2,581		5,355
United States | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			(40)		(47)		132
United States | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			108		60		134
Trinidad
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other			300		182		271
Depreciation, Depletion and Amortization			87		60		80
Operating Income (Loss)			151		75		113
Interest Income			0		1		4
Other Income (Expense)			8		(2)		1
Net Interest Expense (Income)			0		0		0
Income (Loss) Before Income Taxes			159		74		118
Income Tax Provision (Benefit)			66		15		41
Additions to Oil and Gas Properties, Excluding Dry Hole Costs			55		83		53
Total Property, Plant and Equipment, Net			204		210		184
Total Assets			637		546		706
Trinidad | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			31		11		11
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			270		169		259
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		2		5
Trinidad | Gains (Losses) on Asset Dispositions, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			(2)		0		(4)
Trinidad | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues			0		0		0
Other International
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other	[6]		77		55		57
Depreciation, Depletion and Amortization	[6]		6		16		18
Operating Income (Loss)	[6]		(62)	[7]	(73)	[5]	(33)
Interest Income	[6]		0		0		0
Other Income (Expense)			12		0	[6]	1	[6]
Net Interest Expense (Income)	[6]		0		0		(7)
Income (Loss) Before Income Taxes	[6]		(50)		(73)		(25)
Income Tax Provision (Benefit)	[6]		(44)		8		8
Additions to Oil and Gas Properties, Excluding Dry Hole Costs	[6]		5		42		12
Total Property, Plant and Equipment, Net	[6]		9		105		78
Total Assets	[6]		163		211		144
Pretax Impairment Charges For Proved Oil And Gas Properties And Other Property Plant And Equipment			45		81
Dry Hole Costs			42
Other International | Crude Oil and Condensate
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]		0		1		3
Other International | Natural Gas Liquids
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]		0		0		0
Other International | Natural Gas
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]		18		54		58
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		$ 58	59	[6]	0	[6]	(4)	[6]
Other International | Other, Net
Schedule of Segment Reporting Information By Segment [Abstract]
Revenues	[6]		$ 0		$ 0		$ 0

[1] Excludes gains or losses on the mark-to-market of financial commodity derivative contracts, gains or losses on sales of reserves and related assets, interest charges and general corporate expenses for each of the three years in the period ended December 31, 2021.

[2] EOG had sales activity with two significant purchasers in 2021, one totaling $2.7 billion and the other totaling $2.6 billion of consolidated Operating Revenues and Other in the United States segment.

[3] 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.

[4] 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.

[5] 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.

[6] Other International primarily consists of EOG's China and Canada operations. The China operations were sold in the second quarter of 2021. EOG began exploration programs in Australia in the third quarter of 2021 and in Oman in the third quarter of 2020. The decision was reached in the fourth quarter of 2021 to exit Block 36 and Block 49 in Oman.

[7] EOG recorded pretax impairment charges of $45 million and dry hole costs of $42 million in 2021 in the Other International segment related to its decision in the fourth quarter of 2021 to exit Block 36 and Block 49 in Oman. In addition, EOG recorded net gains of asset dispositions of $58 million in 2021 in the Other International segment during the second quarter of 2021 due to the sale of its China operations. See Notes 14 and 17, respectively.