Oil and Gas Exploration and Production Industries Disclosures, Costs Incurred (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved		$ 215	[1]	$ 265	[2]	$ 276	[3]
Acquisition Costs of Properties - Proved		100	[4]	135	[5]	380	[6]
Subtotal		315		400		656
Exploration Costs		354		296		273
Development Costs		3,300	[7]	3,022	[8]	5,699	[9]
Total		3,969		3,718		6,628
Non-Cash Unproved Leasehold Acquisition Costs Related to Property Exchanges		45		197		98
Non-Cash Proved Property Acquisition Costs Related to Property Exchanges		5		15		52
United States
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved		207	[1]	265	[2]	276	[3]
Acquisition Costs of Properties - Proved		100	[4]	97	[5]	380	[6]
Subtotal		307		362		656
Exploration Costs		296		203		214
Development Costs		3,206	[7]	2,998	[8]	5,662	[9]
Total		3,809		3,563		6,532
Asset Retirement Costs Included In Development		86		97		181
Trinidad
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved		0	[1]	0	[2]	0	[3]
Acquisition Costs of Properties - Proved		0	[4]	0	[5]	0	[6]
Subtotal		0		0		0
Exploration Costs		7		81		47
Development Costs		77	[7]	4	[8]	25	[9]
Total		84		85		72
Asset Retirement Costs Included In Development		24				1
Other International
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition Costs of Properties - Unproved	[10]	8	[1]	0	[2]	0	[3]
Acquisition Costs of Properties - Proved	[10]	0	[4]	38	[5]	0	[6]
Subtotal	[10]	8		38		0
Exploration Costs	[10]	51		12		12
Development Costs	[10]	17	[7]	20	[8]	12	[9]
Total	[10]	76		70		24
Asset Retirement Costs Included In Development		$ 17		$ 20		$ 4

[1] Includes non-cash unproved leasehold acquisition costs of $45 million related to property exchanges.

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

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

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

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

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

[7] Includes Asset Retirement Costs of $86 million, $24 million and $17 million for the United States, Trinidad and Other International, respectively. Excludes other property, plant and equipment.

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

[9] 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.

[10] Other International primarily consists of EOG's China and Canada operations. The China operations were sold in the second quarter of 2021. EOG began exploration programs in Australia in the third quarter of 2021 and in Oman in the third quarter of 2020. The decision was reached in the fourth quarter of 2021 to exit Block 36 and Block 49 in Oman.