Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Deferred Tax Assets (Liabilities) Net Noncurrent Classification [Abstract]
Foreign Oil and Gas Exploration and Development Costs Deducted for Tax Under Book Depreciation, Depletion and Amortization		$ 5,825		$ 4,359
Foreign Net Operating Loss		66,675		55,175
Foreign Valuation Allowances		(70,455)		(58,932)
Foreign Other		318		175
Total Net Noncurrent Deferred Income Tax Assets		2,363		777
Deferred Tax (Assets) Liabilities Net Noncurrent Classification [Abstract]
Oil and Gas Exploration and Development Costs Deducted for Tax Over Book Depreciation, Depletion and Amortization		5,277,550		4,583,517	[1]
Commodity Hedging Contracts		(4,699)		4,883
Deferred Compensation Plans		(47,650)		(39,086)
Accrued Expenses and Liabilities		(8,502)		(19,097)
Equity Awards		(108,324)		(93,977)
Alternative Minimum Tax Credit Carryforward		(31,904)		0
Undistributed Foreign Earnings		15,746		22,945
Other		(46,116)		(45,787)
Total Net Noncurrent Deferred Income Tax Liabilities		5,046,101		4,413,398
Total Net Deferred Income Tax Liabilities		5,043,738		4,412,621
Components Income (Loss) Before Income Taxes [Abstract]
United States		3,466,578		4,084,156		$ 621,610
Foreign		78,689		156,842		39,572
Income Before Income Taxes		3,545,267		4,240,998		661,182
Current income tax provision (benefit) [Abstract]
Federal		(152,258)		(303,853)		33,058
State		10,819		17,048		(2,502)
Foreign		81,426		65,615		35,323
Total		(60,013)		(221,190)		65,879
Deferred income tax provision (benefit) [Abstract]
Federal		626,901		862,075		(1,504,288)
State		32,541		43,293		26,942
Foreign		(27,784)		(11,212)		3,474
Total		631,658		894,156		(1,473,872)
Other Non-Current (1)
Federal		245,125	[2]	148,992	[3]	(513,404)	[2]
Other Noncurrent Foreign Income Tax		(6,413)		0		0
Total		238,712		148,992		(513,404)
Income Tax Provision (Benefit)		$ 810,357		$ 821,958		$ (1,921,397)
Federal Statutory and Effective Income Tax Rates [Abstract]
Statutory Federal Income Tax Rate (in hundredths)		21.00%		21.00%		35.00%
State Income Tax, Net of Federal Benefit (in hundredths)		0.97%		1.12%		3.38%
Income Tax Provision Related to Foreign Operations (in hundredths)		0.87%		0.51%		(0.30%)
Income Tax Provision Related to United Kingdom Operations (in hundredths)		0.00%		0.00%		1.78%
Income Tax Provision Related to Canadian Operations (in hundredths)		0.00%		0.00%		2.30%
TCJA (in hundredths)		0.00%		(2.60%)	[4],[5]	(328.10%)	[5],[6]
Shared-Based Compensation (in hundredths)		0.02%		(0.47%)		(4.63%)
Other (in hundredths)		0.00%		(0.18%)		(0.03%)
Effective Income Tax Rate (in hundredths)		22.86%		19.38%		(290.60%)
Provisional Reduction in the Income Tax Provision						$ 2,000,000
Tax NOLs (in hundredths)				(1.20%)
Sequestration (in hundredths)				(1.00%)		(6.40%)
Other Tax Reform Impacts (in hundredths)				(0.40%)		(0.10%)
Federal Tax Rate Reduction (in hundredths)						(327.80%)
Federal Repatriation Tax (in hundredths)						(6.60%)
Components of Valuation Allowance [Abstract]
Beginning Balance		$ 167,142		$ 466,421		$ 383,221
Increase	[7]	30,673		23,062		67,333
Decrease	[8]	(75)		(26,219)		(13,687)
Other	[9]	3,091		(296,122)		29,554
Ending Balance		200,831		$ 167,142		$ 466,421
Balance of state net operating loss expected to be carried forward		2,100,000
Canadian Net Operating Loss Carryforwards		225,000
Unrecognized Tax Benefits Balance		39,000
Unrecognized Tax Benefits that Would Impact On Earnings		25,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		4,000
Foreign and State Deferred Income Taxes		$ 16,000

[1] The 2018 presentation has been changed to conform with current year presentation.

[2] Includes changes in certain amounts that are expected to be paid or received beyond the next twelve months. The primary components are refundable alternative minimum tax (AMT) credits and the 2017 repatriation tax. See the following statutory-to-effective tax rate reconciliation for additional details.

[3] Includes changes in certain amounts that are expected to be paid or received beyond the next twelve months. The primary components are refundable alternative minimum tax (AMT) credits and the 2017 repatriation tax. See the following statutory-to-effective tax rate reconciliation for additional details.

[4] Includes impact of utilizing certain tax net operating losses (NOLs) ((1.2)%), the reversal of sequestration ((1.0)%) and other tax reform impacts ((0.4)%).

[5] The enactment of the Tax Cuts and Jobs Act (TCJA) by the United States in 2017 made numerous changes to federal tax law. Several changes which had a significant impact on EOG include the corporate income tax rate reduction from 35% to 21%, the imposition of a one-time repatriation tax on undistributed foreign earnings and the repeal of the corporate AMT regime (AMT credit carryforwards became refundable over the following four years and were initially subject to a federal sequestration charge). In 2017, EOG revalued its federal deferred income tax assets and liabilities resulting in an earnings benefit of over $2 billion and a substantial reduction of the 2017 effective tax rate. The TCJA measurement-period adjustments were recorded in 2018.

[6] Includes impact of the federal rate reduction ((327.8)%), federal repatriation tax ((6.6)%), sequestration ((6.4)%) and other tax reform impacts ((0.1)%).

[7] Increase in valuation allowance related to the generation of tax NOLs and other deferred tax assets.

[8] Decrease in valuation allowance associated with adjustments to certain deferred tax assets and their related allowance.

[9] Represents dispositions, revisions and/or foreign exchange rate variances and the effect of statutory income tax rate changes. The United Kingdom operations were sold in the fourth quarter of 2018.