Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	$ 3,541,396		$ 2,954,855		$ 10,738,095		$ 8,670,825
Operating Income (Loss)	769,769		605,747		2,694,887		1,857,858
Other Income, Net	11,168		7,596		5,867		22,902
Interest Expense, Net	59,382		53,154		182,950		154,198
Income Before Income Taxes	721,555		560,189		2,517,804		1,726,562
Total Assets	30,147,270				30,147,270				27,336,578
United States [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	3,337,008		2,702,046		9,981,084		7,953,839
Operating Income (Loss)	747,958		545,982		2,522,127		1,711,860
Total Assets	27,151,274				27,151,274				24,523,072
Canada [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	77,515		79,500		350,398		264,059
Operating Income (Loss)	(21,647)		(40,477)		29,683		(93,113)
Total Assets	982,639				982,639				1,202,031
Trinidad [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	122,280		167,402		390,552		434,746
Operating Income (Loss)	61,087		114,709		213,875		284,869
Total Assets	989,262				989,262				1,012,727
Other International [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Net Operating Revenues	4,593	[1]	5,907	[1]	16,061	[1]	18,181	[1]
Operating Income (Loss)	(17,629)	[1]	(14,467)	[1]	(70,798)	[1]	(45,758)	[1]
Total Assets	$ 1,024,095	[1]			$ 1,024,095	[1]			$ 598,748	[1]

[1] Other International primarily includes EOG's United Kingdom, China and Argentina operations.