Oil and Gas Exploration and Production Industries Disclosures, Costs Incurred (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved		$ 487,339	[1]	$ 426,540	[2]	$ 3,216,634	[3]
Acquisition Costs of Properties - Proved		123,684	[4]	72,584	[5]	749,023	[6]
Subtotal		611,023		499,124		3,965,657
Exploration Costs		193,628		223,599		165,751
Development Costs		5,615,029	[7]	3,716,687	[8]	2,313,876	[9]
Total		6,419,680		4,439,410		6,445,284
Non-Cash Unproved Leasehold Acquisition Costs Related to Property Exchanges		291,000		256,000
Non-Cash Proved Property Acquisition Costs Related to Property Exchanges		71,000		26,000
Non-Cash Unproved Leasehold Acquisition Costs Related to Yates Transaction						3,102,000
Non-Cash Proved Property Acquisition Costs Related to Yates Transaction						732,000
United States
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved		486,081	[1]	424,118	[2]	3,216,598	[3]
Acquisition Costs of Properties - Proved		123,684	[4]	72,584	[5]	749,023	[6]
Subtotal		609,765		496,702		3,965,621
Exploration Costs		157,222		144,499		156,295
Development Costs		5,605,264	[7]	3,590,899	[8]	2,252,713	[9]
Total		6,372,251		4,232,100		6,374,629
Asset Retirement Costs Included In Development		90,000		50,000		25,000
Trinidad
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved		1,258	[1]	2,422	[2]	0	[3]
Acquisition Costs of Properties - Proved		0	[4]	0	[5]	0	[6]
Subtotal		1,258		2,422		0
Exploration Costs		22,511		62,547		2,695
Development Costs		(12,863)	[7]	109,491	[8]	72,147	[9]
Total		10,906		174,460		74,842
Asset Retirement Costs Included In Development		(12,000)		2,000		(3,000)
Other International
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved	[10]	0	[1]	0	[2]	36	[3]
Acquisition Costs of Properties - Proved	[10]	0	[4]	0	[5]	0	[6]
Subtotal	[10]	0		0		36
Exploration Costs	[10]	13,895		16,553		6,761
Development Costs	[10]	22,628	[7]	16,297	[8]	(10,984)	[9]
Total	[10]	36,523		32,850		(4,187)
Asset Retirement Costs Included In Development		$ (8,000)		$ 4,000		$ (42,000)

[1] Includes non-cash unproved leasehold acquisition costs of $291 million related to property exchanges.

[2] Includes non-cash unproved leasehold acquisition costs of $256 million related to property exchanges.

[3] Includes non-cash unproved leasehold acquisition costs of $3,102 million related to the Yates transaction.

[4] Includes non-cash proved property acquisition costs of $71 million related to property exchanges.

[5] Includes non-cash proved property acquisition costs of $26 million related to property exchanges.

[6] Includes non-cash proved property acquisition costs of $732 million related to the Yates transaction.

[7] Includes Asset Retirement Costs of $90 million, $(12) million and $(8) million for the United States, Trinidad and Other International, respectively. Excludes other property, plant and equipment.

[8] Includes Asset Retirement Costs of $50 million, $2 million and $4 million for the United States, Trinidad and Other International, respectively. Excludes other property, plant and equipment.

[9] Includes Asset Retirement Costs of $25 million, $(3) million and $(42) million for the United States, Trinidad and Other International, respectively. Excludes other property, plant and equipment.

[10] Other International primarily consists of EOG's United Kingdom, China, Canada and Argentina operations. The United Kingdom operations were sold in the fourth quarter of 2018. The Argentina operations were sold in the third quarter of 2016.