Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net Operating Revenues	$ 1,796,761		$ 2,172,428		$ 2,469,701		$ 2,318,538		$ 4,645,497		$ 5,118,616		$ 4,187,556		$ 4,083,671		$ 8,757,428	[1]	$ 18,035,340	[2]	$ 14,487,118	[3]
Operating Income	(329,753)		(6,222,957)		39,626		(172,995)		1,226,652		1,786,162		1,144,730		1,084,279		(6,686,079)		5,241,823		3,675,211
Income (Loss) Before Income Taxes	(398,826)		(6,274,921)		(11,478)		(236,331)		1,148,593		1,715,120		1,100,813		1,030,789		(6,921,556)		4,995,315		3,436,886
Income Tax Provision	(114,530)		(2,199,182)		(16,746)		(66,583)		704,005		611,502		394,460		369,861		(2,397,041)		2,079,828		1,239,777
Net Income (Loss)	$ (284,296)		$ (4,075,739)		$ 5,268		$ (169,748)		$ 444,588		$ 1,103,618		$ 706,353		$ 660,928		$ (4,524,515)		$ 2,915,487		$ 2,197,109
Net Income (Loss) Per Share
Basic (in dollars per share)	$ (0.52)	[4]	$ (7.47)	[4]	$ 0.01	[4]	$ (0.31)	[4]	$ 0.82	[4]	$ 2.03	[4]	$ 1.30	[4]	$ 1.22	[4]	$ (8.29)		$ 5.36		$ 4.07
Diluted (in dollars per share)	$ (0.52)	[4]	$ (7.47)	[4]	$ 0.01	[4]	$ (0.31)	[4]	$ 0.81	[4]	$ 2.01	[4]	$ 1.29	[4]	$ 1.21	[4]	$ (8.29)		$ 5.32		$ 4.02
Average Number of Common Shares [Abstract]
Basic (in shares)	546,432		545,920		545,504		544,998		544,579		543,984		543,099		542,278		545,697		543,443		540,341
Diluted (in shares)	546,432		545,920		549,683		544,998		549,153		549,518		548,676		548,071		545,697		548,539		546,227

[1] EOG had sales activity with two significant purchasers in 2015, one totaling $1.7 billion and the other totaling $1.4 billion of consolidated Net Operating Revenues in the United States segment.

[2] EOG had sales activity with two significant purchasers in 2014, one totaling $4.0 billion and the other totaling $3.0 billion of consolidated Net Operating Revenues in the United States segment.

[3] EOG had sales activity with two significant purchasers in 2013, one totaling $3.9 billion and the other totaling $2.0 billion of consolidated Net Operating Revenues in the United States segment.

[4] The sum of quarterly net income (loss) per share may not agree with total year net income (loss) per share as each quarterly computation is based on the weighted average of common shares outstanding.