Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2016		Dec. 31, 2015
Income Tax Disclosure [Abstract]
Provisional Reduction in the Income Tax Provision		$ 2,200,000
AMT Credit Carryovers Subject to Expiration		$ 798,000
Sequestration Rate Based On AMT Credits		6.60%
Sequestration Refundable Tax Credits		$ 42,000
Repatriation Tax Of Foreign Earnings		179,000
Deferred Taxes On Accumulated Foreign Earnings		260,000
Provisional Reduction In The Federal Tax Provision		$ 43,000
Bonus Depreciation on Tangible Personal Property		100.00%
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	[1]	$ (40,851)				$ (39,852)	[2]
Foreign Net Operating Loss	[1]	423,258				352,150	[2]
Foreign Valuation Allowances	[1]	(365,379)				(296,596)	[2]
Foreign Other	[1]	478				438	[2]
Total Net Noncurrent Deferred Income Tax Assets	[1]	17,506				16,140	[2]
Deferred Tax (Assets) Liabilities Net Noncurrent Classification [Abstract]
Oil and Gas Exploration and Development Costs Deducted for Tax Over Book Depreciation, Depletion and Amortization	[1]	3,894,739				5,899,533	[2]
Commodity Hedging Contracts	[1]	(12,008)				(22,206)	[2]
Deferred Compensation Plans	[1]	(35,832)				(43,984)	[2]
Accrued Expenses and Liabilities	[1]	12,094				(13,754)	[2]
Net Operating Loss - Federal	[1]	(69,262)				0	[2]
Non-Producing Leasehold Costs	[1]	(47,981)				(64,898)	[2]
Seismic Costs Capitalized for Tax	[1]	(109,423)				(161,920)	[2]
Equity Awards	[1]	(92,696)				(139,787)	[2]
Capitalized Interest	[1]	51,345				86,504	[2]
Alternative Minimum Tax Credit Carryforward (3)	[1],[3]	(77,114)				(757,631)	[2]
Undistributed Foreign Earnings (4)	[1],[4]	19,684				280,099	[2]
Other	[1]	(15,332)				(33,548)	[2]
Total Net Noncurrent Deferred Income Tax Liabilities	[1]	3,518,214				5,028,408	[2]
Total Net Deferred Income Tax Liabilities	[1]	3,500,708				5,012,268	[2]
Federal AMT Credit Carryforwards Expected To Be Refunded		721,000
Components Income Before Income Taxes [Abstract]
United States		621,610				(1,520,573)		$ (6,840,119)
Foreign		39,572				(36,932)		(81,437)
Income (Loss) Before Income Taxes		661,182				(1,557,505)		(6,921,556)
Deferred income tax provision (benefit) [Abstract]
Federal		(1,504,288)				(532,979)		(2,362,926)
State		26,942				4,876		(127,444)
Foreign		3,474				12,897		8,063
Total		(1,473,872)				(515,206)		(2,482,307)
Current income tax provision (benefit) [Abstract]
Federal		33,058				11,567		21,719
State		(2,502)				(8,369)		9,404
Foreign		35,323				51,189		54,143
Total		65,879				54,387		85,266
Other Non-Current [Abstract]
Federal (1)		(513,404)	[5]			0		0
Income Tax Benefit		$ (1,921,397)				$ (460,819)		$ (2,397,041)
Federal Statutory and Effective Income Tax Rates [Abstract]
Statutory Federal Income Tax Rate (in hundredths)		35.00%		21.00%	35.00%	35.00%		35.00%
State Income Tax, Net of Federal Benefit (in hundredths)		3.38%				0.15%		1.11%
Income Tax Provision Related to Foreign Operations (in hundredths)		(0.30%)				(1.23%)		(1.31%)
Income Tax Provision Related to Trinidad Operations (in hundredths)		0.00%				(3.71%)		0.00%
Income Tax Provision Related to United Kingdom Operations (in hundredths)		1.78%				0.00%		0.00%
Income Tax Provision Related to Canadian Operations (in hundredths)		2.30%				0.00%		0.00%
TCJA (in hundredths)	[6]	(328.10%)				0.00%		0.00%
Shared-Based Compensation (1) (in hundredths)	[7]	(4.63%)				0.00%		0.00%
Other (in hundredths)		(0.03%)				(0.62%)		(0.17%)
Effective Income Tax Rate (in hundredths)		(290.60%)				29.59%		34.63%
Federal Tax Rate Reduction (in hundredths)		(327.80%)
Federal Repatriation Tax (in hundredths)		(6.60%)
Sequestration (in hundredths)		6.40%
Other Tax Reform Impacts (in hundredths)		(0.10%)
Components of Valuation Allowance [Abstract]
Beginning Balance		$ 383,221		$ 383,221	$ 383,221	$ 506,127		$ 463,018
Increase	[8]	67,333				37,221		146,602
Decrease	[9]	(13,687)				(12,667)		(4,315)
Other	[10]	29,554				(147,460)		(99,178)
Ending Balance		466,421				$ 383,221		$ 506,127
Balance of state net operating loss expected to be carried forward		1,700,000
Tax net operating loss incurred in United Kingdom in current year		72,000
Balance of tax net operating loss incurred in the United Kingdom in prior years		857,000
U.S. Federal Net Operating Loss Carryforwards		335,000
Canadian Net Operating Loss Carryforwards		158,000
AMT Paid In Years Prior To Prior Reporting Period		41,000
Decrease in Uncertain Tax Positions Related to AMT Credits		40,000
Unrecognized Tax Benefits Balance		39,000
Foreign and State Deferred Income Taxes		$ 20,000

[1] United States federal deferred tax assets and liabilities tax effected at 21% and 35% for 2017 and 2016, respectively.

[2] As described in Note 1, ASU 2015-17 eliminated the requirement to separate deferred tax assets and liabilities into current and noncurrent amounts.

[3] Pursuant to the TCJA, $721 million of federal AMT credit carryforwards are expected to be refundable over four years and are presented as noncurrent tax receivables in Other Assets on the Consolidated Balance Sheet at December 31, 2017.

[4] Undistributed foreign earnings have been deemed repatriated in 2017 in accordance with the TCJA. A portion of the associated federal taxes are now reflected as a noncurrent tax payable as a result of the eight year installment election.

[5] As described previously, under the TCJA, a deemed repatriation tax is to be paid over eight years beginning with respect to taxable year 2017. In addition, EOG expects to receive refunds of AMT credits over a four-year period beginning with respect to taxable year 2018. Other Non-Current includes the portion of these two items that relates to years after 2017.

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

[7] As described in Note 1, ASU 2016-09, adopted by EOG in 2017, provides that share-based compensation tax benefits and deficiencies are recognized in the income tax provision.

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

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

[10] Represents dispositions/revisions/foreign exchange rate variances and the effect of statutory income tax rate changes.