Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Total Operating Revenues and Other	$ 4,320,246	$ 4,303,455	$ 4,697,630	$ 4,058,642	$ 4,574,536	$ 4,781,624	$ 4,238,077	$ 3,681,162	$ 17,379,973		$ 17,275,399		$ 11,208,320
Gathering and Processing Costs									479,102	[1],[2]	436,973	[1],[2]	148,775
Marketing Costs									5,351,524		5,203,243		3,330,237
Total Operating Expenses									13,680,962		12,806,053		10,281,918
Operating Income	863,751	$ 827,959	$ 1,130,771	$ 876,530	1,123,140	$ 1,506,687	$ 964,931	$ 874,588	3,699,011		4,469,346		926,402
Accounts Receivable From Contracts With Customers	$ 1,619,000				$ 1,460,000				1,619,000		1,460,000
Crude Oil and Condensate
Revenues									9,612,532		9,517,440		6,256,396
Natural Gas Liquids
Revenues									784,818		1,127,510		729,561
Natural Gas
Revenues									1,184,095		1,301,537		921,934
Gathering, Processing and Marketing
Revenues									$ 5,360,282		5,230,355		$ 3,298,087
Accounting Standards Update 2014-09 [Member]
Total Operating Revenues and Other											17,052,465
Gathering and Processing Costs											233,258
Marketing Costs											5,184,024
Total Operating Expenses											12,583,119
Operating Income											4,469,346
Accounting Standards Update 2014-09 [Member] | Crude Oil and Condensate
Revenues											9,517,440
Accounting Standards Update 2014-09 [Member] | Natural Gas Liquids
Revenues											1,121,237
Accounting Standards Update 2014-09 [Member] | Natural Gas
Revenues											1,104,095
Accounting Standards Update 2014-09 [Member] | Gathering, Processing and Marketing
Revenues											5,211,136
Effect of Change [Member]
Total Operating Revenues and Other											222,934
Gathering and Processing Costs											203,715
Marketing Costs											19,219
Total Operating Expenses											222,934
Operating Income											0
Effect of Change [Member] | Crude Oil and Condensate
Revenues											0
Effect of Change [Member] | Natural Gas Liquids
Revenues											6,273
Effect of Change [Member] | Natural Gas
Revenues											197,442
Effect of Change [Member] | Gathering, Processing and Marketing
Revenues											$ 19,219

[1] Effective January 1, 2018, EOG adopted the provisions of Accounting Standards Update (ASU) 2014-09, "Revenue From Contracts With Customers" (ASU 2014-09). In connection with the adoption of ASU 2014-09, EOG presents natural gas processing fees relating to certain processing and marketing agreements within its United States segment as Gathering and Processing Costs instead of as a deduction to Natural Gas Revenues. There was no impact to operating income or net income resulting from changes to the presentation of natural gas processing fees (see Note 1 to Consolidated Financial Statements).

[2] Excludes gains or losses on the mark-to-market of financial commodity derivative contracts, gains or losses on sales of reserves and related assets, interest charges and general corporate expenses for each of the three years in the period ended December 31, 2019.