Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		$ 4,781,624	$ 2,644,844	$ 12,700,863	$ 7,867,881
Operating Income (Loss)		1,506,687	214,836	3,346,206	450,490
Other Income (Expense), Net		3,308	226	(4,516)	8,349
Interest Expense, Net		(63,632)	(69,082)	(189,032)	(211,010)
Income Before Income Taxes		1,446,363	145,980	3,152,658	247,829
Total Assets		33,637,736		33,637,736		$ 29,833,078
United States [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		4,653,342	2,569,867	12,339,086	7,620,601
Operating Income (Loss)		1,458,641	207,173	3,251,377	457,018
Total Assets		32,656,676		32,656,676		28,312,599
Trinidad [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		84,648	63,800	247,272	210,022
Operating Income (Loss)		48,988	21,739	117,106	70,512
Total Assets		619,127		619,127		974,477
Other International [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other	[1]	43,634	11,177	114,505	37,258
Operating Income (Loss)	[1]	(942)	$ (14,076)	(22,277)	$ (77,040)
Total Assets	[1]	$ 361,933		$ 361,933		$ 546,002

[1] Other International primarily consists of EOG's United Kingdom, China and Canada operations.