Stock-Based Compensation (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	$ 29,500,000		$ 27,300,000		$ 65,100,000		$ 57,700,000
Common Shares Available for Grant	32,300,000				32,300,000
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-based compensation expense related to stock options, SAR and ESPP grants	11,700,000		10,400,000		23,700,000		20,800,000
Share-Based Compensation Arrangement By Share Based Payment Award Stock Option/SARs, ESPP, Restricted Stock/Units and Performance Units/Stock [Abstract]
Unrecognized compensation expense	83,500,000				83,500,000
Weighted average period over which unrecognized compensation expense will be recognized (in years)					2 years 2 months 12 days
Stock Options and SARs [Member]
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)					$ 27.68		$ 19.33
Expected Volatility (in hundredths)					35.15%		35.82%
Risk-Free Interest Rate (in hundredths)					0.86%		0.48%
Dividend Yield (in hundredths)					0.50%		0.60%
Expected Life (in years)					5 years 2 months 12 days		5 years 6 months
Stock Options and SARs Rollforward [Abstract]
Outstanding at January 1 (in shares)					10,452,000		12,438,000
Granted (in shares)					74,000		62,000
Exercised (1) (in shares)					(922,000)	[1]	(1,938,000)	[1]
Forfeited (in shares)					(185,000)		(112,000)
Outstanding at June 30 (2) (in shares)	9,419,000	[2]	10,450,000	[2]	9,419,000	[2]	10,450,000	[2]
Share-Based Compensation Arrangement By Share Based Payment Award Stock Option/SARs, ESPP, Restricted Stock/Units and Performance Units/Stock [Abstract]
Outstanding at January 1 (price per share)					$ 54.43		$ 42.91
Granted (price per share)					$ 92.51		$ 62.80
Exercised (1) (price per share)					$ 43.76	[1]	$ 32.81	[1]
Forfeited (price per share)					$ 62.02		$ 48.02
Outstanding at June 30 (2) (price per share)	$ 55.62	[2]	$ 44.85	[2]	$ 55.62	[2]	$ 44.85	[2]
Stock Options and SARs Vested or Expected to Vest (in shares)	8,985,000	[3]	9,994,000	[3]	8,985,000	[3]	9,994,000	[3]
Weighted average grant price for stock options/SARs vested or expected to vest (price per share)	$ 55.22	[3]	$ 44.67	[3]	$ 55.22	[3]	$ 44.67	[3]
Stock Options and SARs Exercisable at June 30 (in shares)	3,898,000	[4]	4,510,000	[4]	3,898,000	[4]	4,510,000	[4]
Stock Options and SARs Exercisable at June 30 (price per share)	$ 44.71	[4]	$ 39.99	[4]	$ 44.71	[4]	$ 39.99	[4]
Intrinsic value of stock options/SARs exercised during the period					52,500,000		62,100,000
Aggregate intrinsic value for outstanding stock options and SARs	576,800,000		219,500,000		576,800,000		219,500,000
Weighted average remaining contractual life for stock options/SARs outstanding (in years)					4 years 2 months 12 days		4 years 1 month 6 days
Aggregate intrinsic value of stock options/SARs vested or expected to vest	553,800,000		211,700,000		553,800,000		211,700,000
Weighted average remaining contractual life for stock options/SARs vested or expected to vest (in years)					4 years 2 months 12 days		4 years 1 month 6 days
Aggregate intrinsic value for exercisable units	281,300,000		116,700,000		281,300,000		116,700,000
Weighted average remaining contractual life for exercisable options/SARs (in years)					2 years 9 months 18 days		2 years 7 months 6 days
ESPP [Member]
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)					$ 18.30		$ 14.40
Expected Volatility (in hundredths)					25.83%		29.95%
Risk-Free Interest Rate (in hundredths)					0.09%		0.12%
Dividend Yield (in hundredths)					0.40%		0.60%
Expected Life (in years)					6 months		6 months
Restricted Stock and Restricted Stock Units [Member]
Share-Based Compensation Arrangement By Share Based Payment Award Stock Option/SARs, ESPP, Restricted Stock/Units and Performance Units/Stock [Abstract]
Unrecognized compensation expense	148,500,000				148,500,000
Weighted average period over which unrecognized compensation expense will be recognized (in years)					2 years 1 month 6 days
Share-Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost	16,800,000		16,600,000		39,500,000		36,300,000
Restricted Stock/Restricted Stock Units and Performance Units/Performance Stock [Roll Forward]
Outstanding at January 1 (in shares)					7,358,000		7,636,000
Granted (in shares)					435,000		530,000
Released (in shares)					(1,939,000)	[5]	(586,000)	[5]
Forfeited (in shares)					(181,000)		(108,000)
Outstanding at June 30 (1) (in shares)	5,673,000	[6]	7,472,000	[6]	5,673,000	[6]	7,472,000	[6]
Weighted Average Grant Price Restricted Stock and Restricted Stock Units/Performance Units and Performance Stock [Roll Forward]
Outstanding at January 1 (price per share)					$ 49.54		$ 45.53
Granted (price per share)					$ 94.73		$ 64.25
Released (price per share)					$ 36.85	[5]	$ 61.82	[5]
Forfeited (price per share)					$ 58.48		$ 47.20
Outstanding at June 30 (1) (price per share)	$ 57.06	[6]	$ 45.56	[6]	$ 57.06	[6]	$ 45.56	[6]
Intrinsic value of restricted stock and restricted stock units released during the year					207,000,000		35,400,000
Aggregate intrinsic value of stock and units outstanding	662,900,000		491,900,000		662,900,000		491,900,000
Performance Units and Performance Stock [Member]
Share-Based Compensation Arrangement By Share Based Payment Award Stock Option/SARs, ESPP, Restricted Stock/Units and Performance Units/Stock [Abstract]
Unrecognized compensation expense	4,300,000				4,300,000
Weighted average period over which unrecognized compensation expense will be recognized (in years)					1 year 10 months 24 days
Restricted Stock/Restricted Stock Units and Performance Units/Performance Stock [Roll Forward]
Outstanding at January 1 (in shares)					261,000		143,000
Granted (in shares)					0		0
Released (in shares)					0		0
Forfeited (in shares)					0		0
Outstanding at June 30 (1) (in shares)	261,000	[7]	143,000	[7]	261,000	[7]	143,000	[7]
Weighted Average Grant Price Restricted Stock and Restricted Stock Units/Performance Units and Performance Stock [Roll Forward]
Outstanding at January 1 (price per share)					$ 82.18		$ 67.05
Granted (price per share)					$ 0		$ 0
Released (price per share)					$ 0		$ 0
Forfeited (price per share)					$ 0		$ 0
Outstanding at June 30 (1) (price per share)	$ 82.18	[7]	$ 67.05	[7]	$ 82.18	[7]	$ 67.05	[7]
Aggregate intrinsic value of stock and units outstanding	30,500,000		9,400,000		30,500,000		9,400,000
Performance Units and Performance Stock [Abstract]
Share-Based Compensation Arrangement By Performance Units and Performance Stock Compensation Cost	1,000,000		300,000		1,900,000		600,000
Lease And Well [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	9,100,000		8,400,000		20,700,000		18,200,000
Gathering And Processing Costs [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	200,000		300,000		500,000		600,000
Exploration Costs [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	5,600,000		6,400,000		13,500,000		13,900,000
General And Administrative [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	$ 14,600,000		$ 12,200,000		$ 30,400,000		$ 25,000,000

[1] (1)The total intrinsic value of stock options/SARs exercised for the six months ended June 30, 2014 and 2013 was $52.5 million and $62.1 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] (2)The total intrinsic value of stock options/SARs outstanding at June 30, 2014 and 2013 was $576.8 million and $219.5 million, respectively. At June 30, 2014 and 2013, the weighted average remaining contractual life was 4.2 years and 4.1 years, respectively.

[3] (3)The total intrinsic value of stock options/SARs vested or expected to vest at June 30, 2014 and 2013 was $553.8 million and $211.7 million, respectively. At June 30, 2014 and 2013, the weighted average remaining contractual life was 4.2 years and 4.1 years, respectively.

[4] (4)The total intrinsic value of stock options/SARs exercisable at June 30, 2014 and 2013 was $281.3 million and $116.7 million, respectively. At June 30, 2014 and 2013, the weighted average remaining contractual life was 2.8 years and 2.6 years, respectively.

[5] (1)The total intrinsic value of restricted stock and restricted stock units released for the six months ended June 30, 2014 and 2013 was $207.0 million and $35.4 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date restricted stock and restricted stock units are released.

[6] (2)The total intrinsic value of restricted stock and restricted stock units outstanding at June 30, 2014 and 2013 was $662.9 million and $491.9 million, respectively.

[7] (1)The total intrinsic value of performance units and performance stock outstanding at June 30, 2014 and 2013 was $30.5 million and $9.4 million, respectively.