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Segment Information
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Segment Information Segment Information
Selected financial information by reportable segment is presented below for the three-month periods ended March 31, 2021 and 2020 (in millions):
Three Months Ended
March 31,
 20212020
Operating Revenues and Other
United States$3,606 $4,661 
Trinidad76 42 
Other International (1)
12 15 
Total3,694 4,718 
Operating Income (Loss)  
United States (2)
890 105 
Trinidad43 13 
Other International (1) (3)
(1)(60)
Total932 58 
Reconciling Items  
Other Income (Expense), Net(4)18 
Interest Expense, Net(47)(45)
Income Before Income Taxes$881 $31 
(1)    Other International primarily consists of EOG's China and Canada operations. EOG began an exploration program in Oman in the third quarter of 2020.
(2)    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.
(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.

Total assets by reportable segment are presented below at March 31, 2021 and December 31, 2020 (in millions):
At
March 31,
2021		At
December 31,
2020
Total Assets
United States$35,395 $35,048 
Trinidad586 546 
Other International (1)
190 211 
Total$36,171 $35,805 
(1)    Other International primarily consists of EOG's China and Canada operations. EOG began an exploration program in Oman in the third quarter of 2020.