Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2019		Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Total Operating Expenses		$ 3,566,859		$ 3,273,146	$ 6,748,971		$ 6,079,720
Stock-Based Compensation Expenses		$ 38,566		31,804	$ 77,653		67,289
Common Shares Available for Grant		13,000,000.0			13,000,000.0
Stock Options and SARs
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-based compensation expense related to stock options, SAR and ESPP grants		$ 13,600		$ 11,700	$ 27,500		$ 23,700
Unrecognized compensation expense	[1]	$ 81,300			$ 81,300
Weighted average period over which unrecognized compensation expense will be recognized (in years)					1 year 7 months 6 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)					$ 25.68		$ 29.18
Expected Volatility (in hundredths)					31.50%		28.88%
Risk-Free Interest Rate (in hundredths)					2.38%		2.23%
Dividend Yield (in hundredths)					0.96%		0.67%
Expected Life (in years)					5 years 1 month 6 days		5 years
Stock Options and SARs Rollforward [Abstract]
Outstanding at January 1 (in shares)					8,310,000		9,103,000
Granted (in shares)					32,000		32,000
Exercised (1) (in shares)	[1]				(157,000)		(1,662,000)
Forfeited (in shares)					(107,000)		(124,000)
Outstanding at June 30 (2) (in shares)	[2]	8,078,000		7,349,000	8,078,000		7,349,000
Stock Options and SARs Vested or Expected to Vest (3) (in shares)	[3]	7,741,000		7,006,000	7,741,000		7,006,000
Stock Options and SARs Exercisable at March 31 (4) (in shares)	[4]	3,905,000		2,938,000	3,905,000		2,938,000
Intrinsic Value of Stock Options/SARs Exercised	[1]				$ 3,900		$ 74,500
Weighted Average Remaining Contractual Life for Stock Options/SARs Outstanding (in years)					4 years		4 years 3 months 18 days
Intrinsic Value of Stock Options/SARs Vested or Expected to Vest	[1]	$ 44,400		$ 266,200	$ 44,400		$ 266,200
Weighted average remaining contractual life for stock options/SARs vested or expected to vest (in years)					3 years 10 months 24 days		4 years 3 months 18 days
Aggregate Intrinsic Value for Exercisable Units	[1]	37,100		134,200	$ 37,100		$ 134,200
Weighted average remaining contractual life for exercisable options/SARs (in years)					2 years 6 months		2 years 8 months 12 days
Weighted Average Grant Price Stock Option and SARs [Rollforward]
Intrinsic Value of Stock Options/SARs Outstanding	[1]	$ 45,000		$ 277,200	$ 45,000		$ 277,200
Outstanding at January 1 (price per share)					$ 96.90		$ 83.89
Granted (price per share)					93.29		110.17
Exercised (1) (price per share)	[1]				73.39		71.33
Forfeited (price per share)					105.47		92.07
Outstanding at June 30 (2) (price per share)	[2]	$ 97.23		$ 86.71	97.23		86.71
Vested or Expected to Vest (3) (price per share)	[3]	96.78		86.44	96.78		86.44
Exercisable at June 30 (4) (price per share)	[4]	$ 86.71		$ 78.74	86.71		78.74
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)					$ 22.98		$ 23.27
Expected Volatility (in hundredths)					36.31%		22.04%
Risk-Free Interest Rate (in hundredths)					2.48%		1.60%
Dividend Yield (in hundredths)					0.83%		0.66%
Expected Life (in years)					15 days		15 days
Restricted Stock And Restricted Stock Units
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Unrecognized compensation expense	[1]	$ 158,200			$ 158,200
Weighted average period over which unrecognized compensation expense will be recognized (in years)					1 year 8 months 12 days
Intrinsic value released during the year	[1]				$ 35,700		$ 34,900
Aggregate intrinsic value of stock and units outstanding	[1]	347,500		$ 468,200	347,500		468,200
Restricted Stock/Restricted Stock Units [Roll Forward]
Share-Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost	[1]	$ 23,100		$ 19,000	$ 46,400		$ 41,300
Outstanding at January 1 (in shares)					3,792,000		3,905,000
Granted (in shares)					401,000		309,000
Released (1) (in shares)	[5]				(395,000)		(331,000)
Forfeited (in shares)					(68,000)		(120,000)
Outstanding at June 30 (2) (in shares)	[6]	3,730,000		3,763,000	3,730,000		3,763,000
Weighted Average Grant Price Restricted Stock and Restricted Stock Units [Roll Forward]
Outstanding at January 1 (price per share)					$ 96.64		$ 88.57
Granted (price per share)					96.22		103.52
Released (1) (price per share)	[5]				93.84		69.55
Forfeited (price per share)					98.27		91.28
Outstanding at June 30 (2) (price per share)	[6]	$ 96.86		$ 91.39	$ 96.86		$ 91.39
Performance Unit
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses	[1]	$ 1,900		$ 1,100	$ 3,800		$ 2,300
Unrecognized compensation expense		6,000			$ 6,000
Weighted average period over which unrecognized compensation expense will be recognized (in years)					1 year 2 months 12 days
Intrinsic value released during the year	[1]				$ 7,700
Aggregate intrinsic value of stock and units outstanding		$ 49,200		$ 71,400	$ 49,200		$ 71,400
Minimum Performance Units and Stock Allowed to be Outstanding					205
Maximum Performance Units and Stock Allowed to be Outstanding					852
Restricted Stock/Restricted Stock Units [Roll Forward]
Outstanding at January 1 (in shares)					539		502
Granted (in shares)					0		0
Granted for Performance Multiple (1)	[7]				72		72
Released (1) (in shares)					83		0
Forfeited (in shares)					0		0
Outstanding at June 30 (2) (in shares)	[8]	528	[9]	574	528	[9]	574
Weighted Average Grant Price Restricted Stock and Restricted Stock Units [Roll Forward]
Outstanding at January 1 (price per share)					$ 101.53		$ 90.96
Granted (price per share)					0		0
Granted for Performance Multiple (1) (in dollars per share)	[7]				69.43		101.87
Released (1) (price per share)					85.65		0
Forfeited (price per share)					0		0
Outstanding at June 30 (2) (price per share)	[8]	$ 99.64		$ 92.33	$ 99.64		$ 92.33
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%
Maximum Performance Multiple at the Completion of the Performance Period		200.00%			200.00%
Lease and Well
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses		$ 13,600		$ 11,400	$ 27,300		$ 24,200
Gathering and Processing Costs
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses		300		100	500		200
Exploration Costs
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses		6,500		5,700	13,000		12,600
General and Administrative
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses		$ 18,200		$ 14,600	$ 36,900		$ 30,300

[1] The total intrinsic value of stock options/SARs exercised during the six months ended June 30, 2019 and 2018 was $3.9 million and $74.5 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 June 30, 2019 and 2018 was $45.0 million and $277.2 million, respectively. At June 30, 2019 and 2018, the weighted average remaining contractual life was 4.0 years and 4.3 years, respectively.

[3] The total intrinsic value of stock options/SARs vested or expected to vest at June 30, 2019 and 2018 was $44.4 million and $266.2 million, respectively. At June 30, 2019 and 2018, the weighted average remaining contractual life was 3.9 years and 4.3 years, respectively.

[4] The total intrinsic value of stock options/SARs exercisable at June 30, 2019 and 2018 was $37.1 million and $134.2 million, respectively. At June 30, 2019 and 2018, the weighted average remaining contractual life was 2.5 years and 2.7 years, respectively.

[5] The total intrinsic value of restricted stock and restricted stock units released during the six months ended June 30, 2019 and 2018 was $35.7 million and $34.9 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 June 30, 2019 and 2018 was $347.5 million and $468.2 million, respectively.

[7] Upon completion of the Performance Period for the performance units granted in 2015 and 2014, a performance multiple of 200% was applied to each of the grants resulting in additional grants of performance units in February 2019 and February 2018, respectively.

[8] The total intrinsic value of performance units outstanding at June 30, 2019 and 2018 was approximately $49.2 million and $71.4 million, respectively.

[9] Upon the application of the relevant performance multiple at the completion of each of the remaining Performance Periods, a minimum of 205 and a maximum of 852 performance units could be outstanding.