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Segment Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Selected Information [Line Items]      
Document Period End Date Mar. 31, 2021    
Schedule of Segment Reporting Information By Segment [Abstract]      
Operating Revenues and Other $ 3,694,000,000 $ 4,718,000,000  
Operating Income (Loss) 932,000,000 58,000,000  
Other Income, Net (4,000,000) 18,000,000  
Interest Expense, Net (47,000,000) (45,000,000)  
Income Before Income Taxes 881,000,000 31,000,000  
Total Assets 36,171,000,000   $ 35,805,000,000
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Property, Plant and Equipment   1,456,000,000  
United States      
Schedule of Segment Reporting Information By Segment [Abstract]      
Operating Revenues and Other 3,606,000,000 4,661,000,000  
Operating Income (Loss) 890,000,000 105,000,000 [1]  
Total Assets 35,395,000,000   35,048,000,000
Trinidad      
Schedule of Segment Reporting Information By Segment [Abstract]      
Operating Revenues and Other 76,000,000 42,000,000  
Operating Income (Loss) 43,000,000 13,000,000  
Total Assets 586,000,000   546,000,000
Other International      
Schedule of Segment Reporting Information By Segment [Abstract]      
Operating Revenues and Other [2] 12,000,000 15,000,000  
Operating Income (Loss) [2] (1,000,000) (60,000,000) [3]  
Total Assets [4] $ 190,000,000   $ 211,000,000
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Property, Plant and Equipment   $ 60,000,000  
[1] EOG recorded pretax impairment charges of $1,456 million for the three months ended March 31, 2020, for proved oil and gas properties, leasehold costs and other assets due to the decline in commodity prices.
[2] Other International primarily consists of EOG's China and Canada operations. EOG began an exploration program in Oman in the third quarter of 2020.
[3] EOG recorded pretax impairment charges of $60 million for the three months ended March 31, 2020, for firm commitment contracts related to its decision to exit the Horn River Basin in British Columbia, Canada.
[4] Other International primarily consists of EOG's China and Canada operations. EOG began an exploration program in Oman in the third quarter of 2020.