Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		$ 4,058,642	$ 3,681,162
Operating Income (Loss)		876,530	874,588
Other Income, Net		5,612	727
Interest Expense, Net		(54,906)	(61,956)
Income Before Income Taxes		827,236	813,359
Total Assets		35,663,535		$ 33,934,474
United States
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		3,977,019	3,571,134
Operating Income (Loss)		850,900	845,853
Total Assets		34,860,142		33,178,733
Trinidad
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		69,868	81,013
Operating Income (Loss)		38,832	40,297
Total Assets		670,563		629,633
Other International
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other	[1]	11,755	29,015
Operating Income (Loss)	[1]	(13,202)	$ (11,562)
Total Assets	[1]	$ 132,830		$ 126,108

[1] Other International primarily consists of EOG's United Kingdom, China and Canada operations. The United Kingdom operations were sold in the fourth quarter of 2018.