Unaudited Quarterly Financial Information (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Unaudited Quarterly Financial Information [Abstract]
Net Operating Revenues	$ 3,749,023,000		$ 3,541,396,000		$ 3,840,185,000		$ 3,356,514,000		$ 3,011,811,000		$ 2,954,855,000		$ 2,909,319,000		$ 2,806,651,000		$ 14,487,118,000	[1]	$ 11,682,636,000	[2]	$ 10,126,115,000	[3]
Operating Income (Loss)	980,324,000		769,769,000		1,092,044,000		833,074,000		(378,061,000)		605,747,000		692,339,000		559,772,000		3,675,211,000		1,479,797,000		2,113,309,000
Income (Loss) Before Income Taxes	919,082,000		721,555,000		1,035,230,000		761,019,000		(445,822,000)		560,189,000		646,239,000		520,134,000		3,436,886,000		1,280,740,000		1,909,799,000
Income Tax Provision	338,888,000		259,057,000		375,538,000		266,294,000		59,177,000		204,698,000		250,461,000		196,125,000		1,239,777,000		710,461,000		818,676,000
Net Income (Loss)	580,194,000	[4]	462,498,000	[4]	659,692,000	[4]	494,725,000	[4]	(504,999,000)	[4]	355,491,000	[4]	395,778,000	[4]	324,009,000	[4]	2,197,109,000		570,279,000		1,091,123,000
Net Income (Loss) Per Share [Abstract]
Basic (in dollars per share)	$ 2.14	[5]	$ 1.71	[5]	$ 2.44	[5]	$ 1.84	[5]	$ (1.88)	[5]	$ 1.33	[5]	$ 1.48	[5]	$ 1.22	[5]	$ 8.13		$ 2.13		$ 4.15
Diluted (in dollars per share)	$ 2.12	[5]	$ 1.69	[5]	$ 2.42	[5]	$ 1.82	[5]	$ (1.88)	[5]	$ 1.31	[5]	$ 1.47	[5]	$ 1.20	[5]	$ 8.04		$ 2.11		$ 4.10
Average Number of Common Shares [Abstract]
Basic (in dollars per share)	270,929		270,471		270,016		269,358		268,941		267,941		266,874		266,674		270,170		267,577		262,735
Diluted (in dollars per share)	273,983		273,576		272,739		272,263		268,941		270,982		269,985		270,242		273,114		270,762		266,268
Pretax impairments primarily related to proved and unproved natural gas properties in Canada and United States									1,020,000,000										1,020,000,000
Additional income tax provision for the quarter related to valuation allowances recorded to reduce value of foreign deferred tax assets									$ 135,000,000										$ 135,000,000

[1] 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.

[2] EOG had sales activity with a single significant purchaser in the United States segment in 2012 that totaled $2.2 billion of consolidated Net Operating Revenues.

[3] EOG had no purchasers in 2011 whose sales totaled 10 percent or more of consolidated Net Operating Revenues.

[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.

[5] Fourth quarter 2012 results include the impact of pretax impairments of $1,020 million, primarily related to proved and unproved natural gas properties in Canada and the United States as well as an additional income tax provision of $135 million related to valuation allowances recorded to reduce the value of Canadian deferred tax assets.