Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Provisional Net Tax Benefit				$ 2,200,000
Increase In Provisional Reduction In The Income Tax Provision		$ 52,000
Sequestration Refundable Tax Credits		42,000
Repatriation Tax Of Foreign Earnings		40,000		179,000
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		4,359		(40,851)
Foreign Net Operating Loss		55,175		423,258
Foreign Valuation Allowances		(58,932)		(365,379)
Foreign Other		175		478
Total Net Noncurrent Deferred Income Tax Assets		777		17,506
Deferred Tax (Assets) Liabilities Net Noncurrent Classification [Abstract]
Oil and Gas Exploration and Development Costs Deducted for Tax Over Book Depreciation, Depletion and Amortization		4,819,222		3,894,739
Commodity Hedging Contracts		4,883		(12,008)
Deferred Compensation Plans		(39,086)		(35,832)
Accrued Expenses and Liabilities		(19,097)		12,094
Net Operating Loss - Federal		0		(69,262)
Non-Producing Leasehold Costs		(88,594)		(47,981)
Seismic Costs Capitalized for Tax		(164,932)		(109,423)
Equity Awards		(93,977)		(92,696)
Capitalized Interest		17,821		51,345
Alternative Minimum Tax Credit Carryforward (3)		0		(77,114)
Undistributed Foreign Earnings		22,945		19,684
Other		(45,787)		(15,332)
Total Net Noncurrent Deferred Income Tax Liabilities		4,413,398		3,518,214
Total Net Deferred Income Tax Liabilities		4,412,621		3,500,708
Components Income (Loss) Before Income Taxes [Abstract]
United States		4,084,156		621,610				$ (1,520,573)
Foreign		156,842		39,572				(36,932)
Income (Loss) Before Income Taxes		4,240,998		661,182				(1,557,505)
Current income tax provision (benefit) [Abstract]
Federal		(303,853)		33,058				11,567
State		17,048		(2,502)				(8,369)
Foreign		65,615		35,323				51,189
Total		(221,190)		65,879				54,387
Deferred income tax provision (benefit) [Abstract]
Federal		862,075		(1,504,288)				(532,979)
State		43,293		26,942				4,876
Foreign		(11,212)		3,474				12,897
Total		894,156		(1,473,872)				(515,206)
Other Non-Current [Abstract]
Federal (1)		148,992	[1]	(513,404)	[2]			0
Income Tax Benefit		$ 821,958		$ (1,921,397)				$ (460,819)
Federal Statutory and Effective Income Tax Rates [Abstract]
Statutory Federal Income Tax Rate (in hundredths)		21.00%		35.00%		21.00%	35.00%	35.00%
State Income Tax, Net of Federal Benefit (in hundredths)		1.12%		3.38%				0.15%
Income Tax Provision Related to Foreign Operations (in hundredths)		0.51%		(0.30%)				(1.23%)
Income Tax Provision Related to Trinidad Operations (in hundredths)		0.00%		0.00%				(3.71%)
Income Tax Provision Related to United Kingdom Operations (in hundredths)		0.00%		1.78%				0.00%
Income Tax Provision Related to Canadian Operations (in hundredths)		0.00%		2.30%				0.00%
TCJA (in hundredths)		(2.60%)	[3]	(328.10%)	[4]			0.00%
Shared-Based Compensation (3) (in hundredths)	[5]	(0.47%)		(4.63%)				0.00%
Other (in hundredths)		(0.18%)		(0.03%)				(0.62%)
Effective Income Tax Rate (in hundredths)		19.38%		(290.60%)				29.59%
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		$ 466,421		$ 383,221		$ 383,221	$ 383,221	$ 506,127
Increase	[6]	23,062		67,333				37,221
Decrease	[7]	(26,219)		(13,687)				(12,667)
Other	[8]	(296,122)		29,554				(147,460)
Ending Balance		167,142		$ 466,421				$ 383,221
Balance of state net operating loss expected to be carried forward		1,800,000
Canadian Net Operating Loss Carryforwards		183,000
Unrecognized Tax Benefits Balance		29,000
Unrecognized Tax Benefits that Would Impact On Earnings		12,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		2,000
Foreign and State Deferred Income Taxes		$ 23,000

[1] Includes change in refundable AMT credits and the reversal of the repatriation tax accrued in 2017. See previous discussion regarding the filing of EOG's 2017 U.S. federal income tax return for details.

[2] Includes refundable AMT credits net of the repatriation tax that was expected to be paid post-2017.

[3] Includes impact of utilizing certain tax NOLs ((1.2)%), the IRS's reversal of its sequestration decision ((1.0)%) and other tax reform impacts ((0.4)%).

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

[5] Effective January 1, 2017, EOG adopted the provisions of ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting" (ASU 2016-09), which provides that share-based compensation tax benefits and deficiencies are recognized in the income tax provision.

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

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

[8] 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. The Argentina operations were sold in the third quarter of 2016.