Oil and Gas Exploration and Production Industries Disclosures, Costs Incurred (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved		$ 264,778	[1]	$ 276,092	[2]	$ 487,339	[3]
Acquisition Costs of Properties - Proved		135,162	[4]	379,938	[5]	123,684	[6]
Subtotal		399,940		656,030		611,023
Exploration Costs		296,028		273,339		193,628
Development Costs		3,022,263	[7]	5,698,856	[8]	5,615,029	[9]
Total		3,718,231		6,628,225		6,419,680
Non-Cash Unproved Leasehold Acquisition Costs Related to Property Exchanges		197,000		98,000		291,000
Non-Cash Proved Property Acquisition Costs Related to Property Exchanges		15,000		52,000		71,000
United States
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved		264,778	[1]	276,092	[2]	486,081	[3]
Acquisition Costs of Properties - Proved		97,073	[4]	379,938	[5]	123,684	[6]
Subtotal		361,851		656,030		609,765
Exploration Costs		203,403		213,505		157,222
Development Costs		2,998,155	[7]	5,661,753	[8]	5,605,264	[9]
Total		3,563,409		6,531,288		6,372,251
Asset Retirement Costs Included In Development		97,000		181,000		90,000
Trinidad
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved		0	[1]	0	[2]	1,258	[3]
Acquisition Costs of Properties - Proved		0	[4]	0	[5]	0	[6]
Subtotal		0		0		1,258
Exploration Costs		81,216		46,616		22,511
Development Costs		4,036	[7]	25,007	[8]	(12,863)	[9]
Total		85,252		71,623		10,906
Asset Retirement Costs Included In Development				1,000		(12,000)
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]	0	[3]
Acquisition Costs of Properties - Proved	[10]	38,089	[4]	0	[5]	0	[6]
Subtotal	[10]	38,089		0		0
Exploration Costs	[10]	11,409		13,218		13,895
Development Costs	[10]	20,072	[7]	12,096	[8]	22,628	[9]
Total	[10]	69,570		25,314		36,523
Asset Retirement Costs Included In Development		$ 20,000		$ 4,000		$ (8,000)

[1] Includes non-cash unproved leasehold acquisition costs of $197 million related to property exchanges.

[2] Includes non-cash unproved leasehold acquisition costs of $98 million related to property exchanges.

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

[4] Includes non-cash proved property acquisition costs of $15 million related to property exchanges.

[5] Includes non-cash proved property acquisition costs of $52 million related to property exchanges.

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

[7] Includes Asset Retirement Costs of $97 million and $20 million for the United States and Other International, respectively. Excludes other property, plant and equipment.

[8] Includes Asset Retirement Costs of $181 million, $1 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 $90 million, $(12) million and $(8) 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 and Canada operations. EOG began an exploration program in Oman in the third quarter of 2020. The United Kingdom operations were sold in the fourth quarter of 2018.