Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Stock Options/SARs, Employee Stock Purchase Plan (ESPP), Restricted Stock and Restricted Stock Units and Performance Units Disclosures [Line Items]
Document Period End Date		Mar. 31, 2020
Stock-Based Compensation Expenses		$ 40,072		$ 39,087
Common Shares Available for Grant		6,700,000
Stock Options And SARs
Stock Options/SARs, Employee Stock Purchase Plan (ESPP), Restricted Stock and Restricted Stock Units and Performance Units Disclosures [Line Items]
Stock-based compensation expense related to stock options, SAR and ESPP grants		$ 14,100		$ 13,900
Unrecognized compensation expense		$ 74,900
Weighted average period over which unrecognized compensation expense will be recognized (in years)		1 year 8 months 12 days
Weighted Average Fair Values And Valuation Assumptions Used To Value Stock Option/SARs, ESPP, and Performance Units/Stock Stock-Based Compensation [Abstract]
Weighted Average Fair Value of Grants (price per share)		$ 19.67		$ 27.19
Expected Volatility (in hundredths)		33.43%		31.81%
Risk-Free Interest Rate (in hundredths)		1.43%		2.51%
Dividend Yield (in hundredths)		1.60%		0.88%
Expected Life (in years)		5 years		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1 (in shares)		9,395,000		8,310,000
Exercised (1) (in shares)	[1]	(23,000)		(43,000)
Granted (in shares)		9,000		17,000
Forfeited (in shares)		(47,000)		(48,000)
Outstanding at March 31 (2) (in shares)	[2]	9,334,000		8,236,000
Stock Options and SARs Vested or Expected to Vest (3) (in shares)	[3]	8,998,000		7,892,000
Stock Options and SARs Exercisable at March 31 (4) (in shares)	[4]	5,249,000		3,997,000
Intrinsic Value of Stock Options/SARs Exercised	[1]	$ 400		$ 1,100
Intrinsic Value of Stock Options/SARs Outstanding	[2]	$ 0		$ 51,800
Weighted Average Remaining Contractual Life for Stock Options/SARs Outstanding (in years)	[2]	4 years		4 years 2 months 12 days
Intrinsic Value of Stock Options/SARs Vested or Expected to Vest	[3]	$ 0		$ 51,100
Weighted average remaining contractual life for stock options/SARs vested or expected to vest (in years)	[3]	4 years		4 years 1 month 6 days
Aggregate Intrinsic Value for Exercisable Units	[4]	$ 0		$ 43,100
Weighted average remaining contractual life for exercisable options/SARs (in years)	[4]	2 years 9 months 18 days		2 years 8 months 12 days
Weighted Average Grant Price Stock Option and SARs [Rollforward]
Outstanding at January 1 (price per share)		$ 94.53		$ 96.90
Granted (price per share)		75.44		96.67
Exercised (1) (price per share)	[1]	69.59		69.94
Forfeited (price per share)		96.81		105.43
Outstanding at March 31 (2) (price per share)	[2]	94.56		96.99
Vested or Expected to Vest (3) (price per share)	[3]	94.55		96.53
Exercisable at March 31 (4) (price per share)	[4]	94.33		86.25
ESPP
Weighted Average Fair Values And Valuation Assumptions Used To Value Stock Option/SARs, ESPP, and Performance Units/Stock Stock-Based Compensation [Abstract]
Weighted Average Fair Value of Grants (price per share)		$ 20.80		$ 22.98
Expected Volatility (in hundredths)		35.24%		36.31%
Risk-Free Interest Rate (in hundredths)		1.56%		2.48%
Dividend Yield (in hundredths)		1.56%		0.83%
Expected Life (in years)		15 days		15 days
Restricted Stock And Restricted Stock Units
Stock Options/SARs, Employee Stock Purchase Plan (ESPP), Restricted Stock and Restricted Stock Units and Performance Units Disclosures [Line Items]
Unrecognized compensation expense		$ 177,800
Weighted average period over which unrecognized compensation expense will be recognized (in years)		1 year 7 months 6 days
Intrinsic value released during the year	[5]	$ 11,000		$ 22,000
Aggregate intrinsic value of stock and units outstanding	[6]	154,500		370,200
Restricted Stock/Restricted Stock Units and Performance Units [Roll Forward]
Share-Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost		$ 24,800		$ 23,300
Outstanding at January 1 (in shares)		4,546,000		3,792,000
Granted (in shares)		26,000		371,000
Released (1) (in shares)	[5]	(259,000)		(247,000)
Forfeited (in shares)		(11,000)		(26,000)
Outstanding at March 31 (2) (in shares)	[6]	4,302,000		3,890,000
Weighted Average Grant Price Restricted Stock and Restricted Stock Units [Roll Forward]
Outstanding at January 1 (price per share)		$ 90.16		$ 96.64
Granted (price per share)		63.48		96.72
Released (1) (price per share)	[5]	88.19		93.37
Forfeited (price per share)		89.86		98.11
Outstanding at March 31 (2) (price per share)	[6]	$ 90.12		$ 96.85
Performance Unit
Stock Options/SARs, Employee Stock Purchase Plan (ESPP), Restricted Stock and Restricted Stock Units and Performance Units Disclosures [Line Items]
Stock-Based Compensation Expenses		$ 1,200		$ 1,900
Unrecognized compensation expense		$ 7,500
Weighted average period over which unrecognized compensation expense will be recognized (in years)		2 years
Intrinsic value released during the year	[7]	$ 9,000		0
Aggregate intrinsic value of stock and units outstanding	[8]	$ 19,500		$ 58,100
Restricted Stock/Restricted Stock Units and Performance Units [Roll Forward]
Outstanding at January 1 (in shares)		598		539
Granted (in shares)		0		0
Granted for Performance Multiple (1)	[9]	66		72
Released (1) (in shares)	[7]	(121)		0
Forfeited (in shares)		0		0
Outstanding at March 31 (2) (in shares)	[8]	543	[10]	611
Weighted Average Grant Price Restricted Stock and Restricted Stock Units [Roll Forward]
Outstanding at January 1 (price per share)		$ 92.19		$ 101.53
Granted (price per share)		0		0
Granted for Performance Multiple (1) (in dollars per share)	[9]	100.95		69.43
Released (1) (price per share)	[7]	104.69		0
Forfeited (price per share)		0		0
Outstanding at March 31 (2) (price per share)	[8]	$ 90.48		$ 97.75
Performance Units and Performance Stock Disclosures [Abstract]
Performance Period for Performance Units and Shares		3 years
Minimum Performance Multiple at the Completion of the Performance Period		0.00%
Performance Multiple Applied at the Completion Period	[9]	150.00%
Performance Multiple Applied at the Completion Period	[9]	200.00%
Minimum Performance Units and Stock Allowed to be Outstanding	[10]	179
Maximum Performance Units and Stock Allowed to be Outstanding	[10]	907
Lease and Well
Stock Options/SARs, Employee Stock Purchase Plan (ESPP), Restricted Stock and Restricted Stock Units and Performance Units Disclosures [Line Items]
Stock-Based Compensation Expenses		$ 15,100		$ 13,700
Gathering and Processing Costs
Stock Options/SARs, Employee Stock Purchase Plan (ESPP), Restricted Stock and Restricted Stock Units and Performance Units Disclosures [Line Items]
Stock-Based Compensation Expenses		300		200
Exploration Costs
Stock Options/SARs, Employee Stock Purchase Plan (ESPP), Restricted Stock and Restricted Stock Units and Performance Units Disclosures [Line Items]
Stock-Based Compensation Expenses		7,200		6,500
General and Administrative
Stock Options/SARs, Employee Stock Purchase Plan (ESPP), Restricted Stock and Restricted Stock Units and Performance Units Disclosures [Line Items]
Stock-Based Compensation Expenses		$ 17,500		$ 18,700

[1] The total intrinsic value of stock options/SARs exercised during the three months ended March 31, 2020 and 2019 was $0.4 million and $1.1 million, respectively. The intrinsic value is based upon the difference between the market price of EOG's common stock on the date of exercise and the grant price of the stock options/SARs.

[2] The total intrinsic value of stock options/SARs outstanding at March 31, 2020 and 2019 was zero and $51.8 million, respectively. At March 31, 2020 and 2019, the weighted average remaining contractual life was 4.0 years and 4.2 years, respectively.

[3] The total intrinsic value of stock options/SARs vested or expected to vest at March 31, 2020 and 2019 was zero and $51.1 million, respectively. At March 31, 2020 and 2019, the weighted average remaining contractual life was 4.0 years and 4.1 years, respectively.

[4] The total intrinsic value of stock options/SARs exercisable at March 31, 2020 and 2019 was zero and $43.1 million, respectively. At March 31, 2020 and 2019, the weighted average remaining contractual life was 2.8 years and 2.7 years, respectively.

[5] The total intrinsic value of restricted stock and restricted stock units released during the three months ended March 31, 2020 and 2019 was $11.0 million and $22.0 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date the restricted stock and restricted stock units are released.

[6] The total intrinsic value of restricted stock and restricted stock units outstanding at March 31, 2020 and 2019 was $154.5 million and $370.2 million, respectively.

[7] The total intrinsic value of performance units released during the three months ended March 31, 2020 was $9.0 million. The intrinsic value is based upon the closing price of EOG's common stock on the date the performance units are released. There were no performance units released during the three months ended March 31, 2019.

[8] The total intrinsic value of performance units outstanding at March 31, 2020 and 2019 was approximately $19.5 million and $58.1 million, respectively.

[9] Upon completion of the Performance Period for the performance units granted in 2016 and 2015, a performance multiple of 150% and 200%, respectively, was applied to each of the grants resulting in additional grants of performance units in February 2020 and February 2019, respectively.

[10] Upon the application of the relevant performance multiple at the completion of each of the remaining Performance Periods, a minimum of 179 and a maximum of 907 performance units could be outstanding.