Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	$ 35.6		$ 30.4
Common Shares Available for Grant	32,200,000
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock-based compensation expense related to stock options, SAR and ESPP grants	12.0		10.4
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	$ 26.11		$ 19.31
Expected Volatility (in hundredths)	35.89%		35.54%
Risk-Free Interest Rate (in hundredths)	0.84%		0.50%
Dividend Yield (in hundredths)	0.48%		0.60%
Expected Life (in years)	5 years 3 months 18 days		5 years 7 months 6 days
Stock Options and SARs Rollforward [Abstract]
Outstanding at January 1 (in shares)	10,452,000		12,438,000
Granted (in shares)	40,000		30,000
Exercised (1) (in shares)	(353,000)	[1]	(1,122,000)	[1]
Forfeited (in shares)	(66,000)		(60,000)
Outstanding at March 31 (in shares)	10,073,000	[2]	11,286,000	[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)	$ 84.74		$ 62.52
Exercised (1) (price per share)	$ 44.40	[1]	$ 31.16	[1]
Forfeited (price per share)	$ 61.56		$ 47.25
Outstanding at March 31 (price per share)	$ 54.85	[2]	$ 44.11	[2]
Stock Options and SARs Vested or Expected to Vest (in shares)	9,619,000	[3]	10,820,000	[3]
Weighted average grant price for stock options/SARs vested or expected to vest (price per share)	$ 54.44	[3]	$ 43.91	[3]
Stock Options and SARs Exercisable at March 31 (in shares)	4,314,000	[4]	5,206,000	[4]
Stock Options and SARs Exercisable at March 31 (price per share)	$ 44.00	[4]	$ 38.95	[4]
Intrinsic value of stock options/SARs exercised during the period	16.2	[1]	36.2	[1]
Aggregate intrinsic value for outstanding stock options and SARs	435.5	[2]	225.1	[2]
Weighted average remaining contractual life for stock options/SARs outstanding (in years)	4 years 4 months 24 days	[2]	4 years 2 months 12 days	[2]
Aggregate intrinsic value of stock options/SARs vested or expected to vest	419.8	[3]	218.0	[3]
Weighted average remaining contractual life for stock options/SARs vested or expected to vest (in years)	4 years 3 months 18 days	[3]	4 years 1 month 6 days	[3]
Aggregate intrinsic value for exercisable units	233.3	[4]	130.7	[4]
Weighted average remaining contractual life for exercisable options/SARs (in years)	3 years	[4]	2 years 8 months 12 days	[4]
Unrecognized compensation expense	94.3
Weighted average period over which unrecognized compensation expense will be recognized (in years)	2 years 4 months 24 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	$ 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)	0.44%		0.60%
Expected Life (in years)	0 years 6 months		0 years 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	165.7
Weighted average period over which unrecognized compensation expense will be recognized (in years)			2 years 7 months 6 days
Share-Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost	22.7		19.7
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)	384,000		500,000
Released (in shares)	(838,000)	[5]	(306,000)	[5]
Forfeited (in shares)	(55,000)		(62,000)
Outstanding at March 31 (in shares)	6,849,000	[6]	7,768,000	[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)	$ 94.01		$ 64.29
Released (price per share)	$ 24.47	[5]	$ 59.81	[5]
Forfeited (price per share)	$ 57.73		$ 46.66
Outstanding at March 31 (price per share)	$ 55.04	[6]	$ 46.17	[6]
Intrinsic value of restricted stock and restricted stock units released during the year	79.0	[5]	19.0	[5]
Aggregate intrinsic value of stock and units outstanding	671.8	[6]	497.4	[6]
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	5.2
Weighted average period over which unrecognized compensation expense will be recognized (in years)	2 years 2 months 12 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 March 31 (in shares)	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 March 31 (price per share)	$ 82.18	[7]	$ 67.05	[7]
Aggregate intrinsic value of stock and units outstanding	21.9	[7]	8.7	[7]
Performance Units and Performance Stock [Abstract]
Share-Based Compensation Arrangement By Performance Units and Performance Stock Compensation Cost	0.9		0.3
Lease And Well [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	11.6		9.8
Gathering And Processing Costs [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	0.3		0.3
Exploration Costs [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	7.9		7.5
General And Administrative [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	$ 15.8		$ 12.8

[1] The total intrinsic value of stock options/SARs exercised for the three months ended March 31, 2014 and 2013 was $16.2 million and $36.2 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, 2014 and 2013 was $435.5 million and $225.1 million, respectively. At March 31, 2014 and 2013, the weighted average remaining contractual life was 4.4 years and 4.2 years, respectively.

[3] The total intrinsic value of stock options/SARs vested or expected to vest at March 31, 2014 and 2013 was $419.8 million and $218.0 million, respectively. At March 31, 2014 and 2013, the weighted average remaining contractual life was 4.3 years and 4.1 years, respectively.

[4] The total intrinsic value of stock options/SARs exercisable at March 31, 2014 and 2013 was $233.3 million and $130.7 million, respectively. At March 31, 2014 and 2013, the weighted average remaining contractual life was 3.0 years and 2.7 years, respectively.

[5] The total intrinsic value of restricted stock and restricted stock units released for the three months ended March 31, 2014 and 2013 was $79.0 million and $19.0 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] The total intrinsic value of restricted stock and restricted stock units outstanding at March 31, 2014 and 2013 was $671.8 million and $497.4 million, respectively.

[7] The total intrinsic value of performance units and performance stock outstanding at March 31, 2014 and 2013 was $21.9 million and $8.7 million, respectively.