Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2019		Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses		$ 54,670		$ 49,001	$ 132,323		$ 116,290
Common Shares Available for Grant		7,700,000			7,700,000
Unrecognized compensation expense	[1]	$ 100,500			$ 100,500
Weighted average period over which unrecognized compensation expense will be recognized (in years)					2 years 2 months 12 days
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		$ 20,400		$ 21,700	$ 47,800		$ 45,400
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)					$ 19.49		$ 33.49
Expected Volatility (in hundredths)					32.01%		28.22%
Risk-Free Interest Rate (in hundredths)					1.69%		2.68%
Dividend Yield (in hundredths)					1.39%		0.72%
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)					1,946,000		1,884,000
Exercised (1) (in shares)	[1]				(586,000)		(2,144,000)
Forfeited (in shares)					(200,000)		(167,000)
Outstanding at September 30 (2) (in shares)	[2]	9,470,000		8,676,000	9,470,000		8,676,000
Stock Options and SARs Vested or Expected to Vest (3) (in shares)	[3]	9,127,000		8,316,000	9,127,000		8,316,000
Stock Options and SARs Exercisable at September 30 (4) (in shares)	[4]	5,307,000		4,202,000	5,307,000		4,202,000
Intrinsic Value of Stock Options/SARs Exercised	[1]				$ 13,300		$ 103,700
Weighted Average Remaining Contractual Life for Stock Options/SARs Outstanding (in years)					4 years 6 months		4 years 9 months 18 days
Intrinsic Value of Stock Options/SARs Vested or Expected to Vest	[1]	$ 4,800		$ 261,900	$ 4,800		$ 261,900
Weighted average remaining contractual life for stock options/SARs vested or expected to vest (in years)					4 years 6 months		4 years 8 months 12 days
Aggregate Intrinsic Value for Exercisable Units	[1]	4,700		175,500	$ 4,700		$ 175,500
Weighted average remaining contractual life for exercisable options/SARs (in years)					3 years 3 months 18 days		3 years 4 months 24 days
Weighted Average Grant Price Stock Option and SARs [Rollforward]
Intrinsic Value of Stock Options/SARs Outstanding	[1]	$ 4,800		$ 269,100	$ 4,800		$ 269,100
Outstanding at January 1 (price per share)					$ 96.90		$ 83.89
Granted (price per share)					75.43		126.65
Exercised (1) (price per share)	[1]				61.19		69.62
Forfeited (price per share)					104.89		91.89
Outstanding at September 30 (2) (price per share)	[2]	$ 94.53		$ 96.55	94.53		96.55
Vested or Expected to Vest (3) (price per share)	[3]	94.51		96.08	94.51		96.08
Exercisable at September 30 (4) (price per share)	[4]	$ 94.08		$ 85.80	94.08		85.80
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)					$ 22.83		$ 25.52
Expected Volatility (in hundredths)					34.83%		24.36%
Risk-Free Interest Rate (in hundredths)					2.28%		1.86%
Dividend Yield (in hundredths)					1.04%		0.64%
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]	$ 227,500			$ 227,500
Weighted average period over which unrecognized compensation expense will be recognized (in years)					2 years
Intrinsic value released during the year	[1]				$ 61,200		$ 80,200
Aggregate intrinsic value of stock and units outstanding	[1]	345,800		$ 489,700	345,800		489,700
Restricted Stock/Restricted Stock Units [Roll Forward]
Share-Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost	[1]	$ 24,700		$ 17,500	$ 71,100		$ 58,800
Outstanding at January 1 (in shares)					3,792,000		3,905,000
Granted (in shares)					1,728,000		792,000
Released (1) (in shares)	[5]				(732,000)		(708,000)
Forfeited (in shares)					(129,000)		(150,000)
Outstanding at September 30 (2) (in shares)	[6]	4,659,000		3,839,000	4,659,000		3,839,000
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)					80.12		117.67
Released (1) (price per share)	[5]				97.51		77.46
Forfeited (price per share)					97.81		91.36
Outstanding at September 30 (2) (price per share)	[6]	$ 90.34		$ 96.52	$ 90.34		$ 96.52
Performance Unit
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses	[1]	$ 9,600		$ 9,800	$ 13,400		$ 12,100
Unrecognized compensation expense		10,100			$ 10,100
Weighted average period over which unrecognized compensation expense will be recognized (in years)					2 years 2 months 12 days
Intrinsic value released during the year	[1]				$ 15,400		17,700
Aggregate intrinsic value of stock and units outstanding		$ 44,400		$ 68,000	$ 44,400		$ 68,000
Restricted Stock/Restricted Stock Units [Roll Forward]
Outstanding at January 1 (in shares)					539		502
Granted (in shares)					172		107
Granted for Performance Multiple (1)	[7]				72		72
Released (1) (in shares)					185		148
Forfeited (in shares)					0		0
Outstanding at September 30 (2) (in shares)	[8]	598	[9]	533	598	[9]	533
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)					75.09		127.00
Granted for Performance Multiple (1) (in dollars per share)	[7]				69.43		101.87
Released (1) (price per share)					94.63		84.43
Forfeited (price per share)					0		0
Outstanding at September 30 (2) (price per share)	[8]	$ 92.19		$ 101.50	$ 92.19		$ 101.50
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%
Minimum Performance Units and Stock Allowed to be Outstanding					102,000
Maximum Performance Units and Stock Allowed to be Outstanding					1,094,000
Lease and Well
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses		$ 13,300		$ 12,900	$ 40,600		$ 37,100
Gathering and Processing Costs
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses		300		100	800		300
Exploration Costs
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses		5,200		5,800	18,100		18,400
General and Administrative
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-Based Compensation Expenses		$ 35,900		$ 30,200	$ 72,800		$ 60,500

[1] The total intrinsic value of stock options/SARs exercised during the nine months ended September 30, 2019 and 2018 was $13.3 million and $103.7 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 September 30, 2019 and 2018 was $4.8 million and $269.1 million, respectively. At September 30, 2019 and 2018, the weighted average remaining contractual life was 4.5 years and 4.8 years, respectively.

[3] The total intrinsic value of stock options/SARs vested or expected to vest at September 30, 2019 and 2018 was $4.8 million and $261.9 million, respectively. At September 30, 2019 and 2018, the weighted average remaining contractual life was 4.5 years and 4.7 years, respectively.

[4] The total intrinsic value of stock options/SARs exercisable at September 30, 2019 and 2018 was $4.7 million and $175.5 million, respectively. At September 30, 2019 and 2018, the weighted average remaining contractual life was 3.3 years and 3.4 years, respectively.

[5] The total intrinsic value of restricted stock and restricted stock units released during the nine months ended September 30, 2019 and 2018 was $61.2 million and $80.2 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 September 30, 2019 and 2018 was $345.8 million and $489.7 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 September 30, 2019 and 2018 was approximately $44.4 million and $68.0 million, respectively.

[9] The total intrinsic value of performance units released during the nine months ended September 30, 2019 and 2018, was $15.4 million and $17.7 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date the performance units are released.