Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		$ 4,303,455	$ 4,781,624	$ 13,059,727	$ 12,700,863
Operating Income (Loss)		827,959	1,506,687	2,835,260	3,346,206
Other Income, Net		9,118	3,308	23,233	(4,516)
Interest Expense, Net		(39,620)	(63,632)	(144,434)	(189,032)
Income Before Income Taxes		797,457	1,446,363	2,714,059	3,152,658
Total Assets		36,542,269		36,542,269		$ 33,934,474
United States
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		4,224,510	4,653,342	12,813,318	12,339,086
Operating Income (Loss)		825,983	1,458,641	2,784,793	3,251,377
Total Assets		35,765,137		35,765,137		33,178,733
Trinidad
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		64,726	84,648	205,726	247,272
Operating Income (Loss)		8,991	48,988	82,213	117,106
Total Assets		617,465		617,465		629,633
Other International
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other	[1]	14,219	43,634	40,683	114,505
Operating Income (Loss)	[1]	(7,015)	$ (942)	(31,746)	$ (22,277)
Total Assets	[1]	$ 159,667		$ 159,667		$ 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.